adding checkstyle

pom.xml

@@ -224,11 +224,43 @@
             <artifactId>jakarta.xml.bind-api</artifactId>
             <version>4.0.2</version>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>5.12.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-checkstyle-plugin</artifactId>
+            <version>3.3.1</version>
+        </dependency>
     </dependencies>
 
     <build>
         <defaultGoal>spring-boot:run</defaultGoal>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.3.1</version>
+                <configuration>
+                    <configLocation>src/main/resources/checkstyle.xml</configLocation>
+                    <consoleOutput>true</consoleOutput>
+                    <failsOnError>true</failsOnError>
+                    <sourceDirectories>
+                        <directory>${project.build.sourceDirectory}</directory>
+                    </sourceDirectories>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <phase>compile</phase>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
@@ -351,6 +383,28 @@
         </plugins>
     </build>
 
+    <reporting>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.3.1</version>
+                <configuration>
+                    <configLocation>src/main/resources/checkstyle.xml</configLocation>
+                    <failOnViolation>true</failOnViolation>
+                    <enableFilesSummary>true</enableFilesSummary>
+                </configuration>
+                <reportSets>
+                    <reportSet>
+                        <reports>
+                            <report>checkstyle-aggregate</report>
+                        </reports>
+                    </reportSet>
+                </reportSets>
+            </plugin>
+        </plugins>
+    </reporting>
+
     <profiles>
         <profile>
             <!-- Production mode is activated using -Pproduction -->

src/main/java/com/primefactorsolutions/invoices/Application.java

@@ -16,7 +16,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 @Theme(value = "pfs")
 public class Application implements AppShellConfigurator {
 
-    public static void main(String[] args) {
+    public static void main(final String[] args) {
         SpringApplication.run(Application.class, args);
     }
 

src/main/java/com/primefactorsolutions/invoices/beans/CabeceraDTO.java

@@ -17,45 +17,45 @@ public class CabeceraDTO {
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "9999999999999", inclusive = true)
-    protected long nitEmisor;
-    @XmlElement(required = true)
+    private long nitEmisor;
+
     @NotNull
     @Size(min = 1, max = 200)
-    protected String razonSocialEmisor;
-    @XmlElement(required = true)
+    private String razonSocialEmisor;
+
     @NotNull
     @Size(min = 1, max = 25)
-    protected String municipio;
-    @XmlElement(required = true, nillable = true)
+    private String municipio;
+
     @Size(min = 1, max = 25)
-    protected String telefono;
+    private String telefono;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "9999999999", inclusive = true)
-    protected long numeroFactura;
+    private long numeroFactura;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 100)
-    protected String cuf;
+    private String cuf;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 100)
-    protected String cufd;
+    private String cufd;
     @NotNull
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999", inclusive = true)
-    protected int codigoSucursal;
+    private int codigoSucursal;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 500)
-    protected String direccion;
+    private String direccion;
     @XmlElement(required = true, type = Integer.class, nillable = true)
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999", inclusive = true)
-    protected Integer codigoPuntoVenta;
+    private Integer codigoPuntoVenta;
     @XmlElement(required = true, type = String.class)
     @XmlJavaTypeAdapter(DateTimeXmlAdapter.class)
     @XmlSchemaType(name = "dateTime")
     @NotNull
-    protected LocalDateTime fechaEmision;
+    private LocalDateTime fechaEmision;
 }

src/main/java/com/primefactorsolutions/invoices/beans/ClientDTO.java

@@ -11,40 +11,40 @@ import lombok.Data;
 public class ClientDTO {
     @XmlElement(required = true, nillable = true)
     @Size(min = 1, max = 500)
-    protected String nombreRazonSocial;
+    private String nombreRazonSocial;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "5", inclusive = true)
-    protected int codigoTipoDocumentoIdentidad;
+    private int codigoTipoDocumentoIdentidad;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 20)
-    protected String numeroDocumento;
+    private String numeroDocumento;
     @XmlElement(required = true, nillable = true)
     @Size(max = 5)
-    protected String complemento;
+    private String complemento;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 500)
-    protected String direccionComprador;
+    private String direccionComprador;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 100)
-    protected String codigoCliente;
+    private String codigoCliente;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 500)
-    protected String lugarDestino;
+    private String lugarDestino;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "212", inclusive = true)
-    protected int codigoPais;
+    private int codigoPais;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "308", inclusive = true)
-    protected int codigoMetodoPago;
+    private int codigoMetodoPago;
     @XmlElement(required = true, type = Long.class, nillable = true)
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999999999999999", inclusive = true)
-    protected Long numeroTarjeta;
+    private Long numeroTarjeta;
 }

src/main/java/com/primefactorsolutions/invoices/beans/DetalleDTO.java

@@ -13,38 +13,38 @@ public class DetalleDTO {
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 10)
-    protected String actividadEconomica;
+    private String actividadEconomica;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "99999999", inclusive = true)
-    protected int codigoProductoSin;
+    private int codigoProductoSin;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 50)
-    protected String codigoProducto;
+    private String codigoProducto;
     @XmlElement(required = true)
     @NotNull
     @Size(min = 1, max = 500)
-    protected String descripcion;
+    private String descripcion;
     @XmlElement(required = true)
     @NotNull
-    protected BigInteger cantidad;
+    private BigInteger cantidad;
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "200", inclusive = true)
-    protected int unidadMedida;
+    private int unidadMedida;
     @XmlElement(required = true)
     @NotNull
     @DecimalMin(value = "0", inclusive = false)
     @Digits(integer = 20, fraction = 5)
-    protected BigDecimal precioUnitario;
+    private BigDecimal precioUnitario;
     @XmlElement(required = true, nillable = true)
     @DecimalMin(value = "0", inclusive = true)
     @Digits(integer = 20, fraction = 5)
-    protected BigDecimal montoDescuento;
+    private BigDecimal montoDescuento;
     @XmlElement(required = true)
     @NotNull
     @DecimalMin(value = "0", inclusive = false)
     @Digits(integer = 20, fraction = 5)
-    protected BigDecimal subTotal;
+    private BigDecimal subTotal;
 }

src/main/java/com/primefactorsolutions/invoices/beans/TotalesDTO.java

@@ -15,20 +15,20 @@ public class TotalesDTO {
     @NotNull
     @DecimalMin(value = "0", inclusive = false)
     @Digits(integer = 17, fraction = 2)
-    protected BigDecimal montoTotal;
+    private BigDecimal montoTotal;
     @XmlElement(required = true)
     @NotNull
-    protected BigDecimal montoTotalSujetoIva;
+    private BigDecimal montoTotalSujetoIva;
     @XmlElement(required = true)
     @NotNull
     @DecimalMin(value = "0", inclusive = false)
     @Digits(integer = 17, fraction = 2)
-    protected BigDecimal montoTotalMoneda;
+    private BigDecimal montoTotalMoneda;
     @XmlElement(required = true, nillable = true)
     @Size(min = 1, max = 10000)
-    protected String informacionAdicional;
+    private String informacionAdicional;
     @XmlElement(required = true, nillable = true)
     @DecimalMin(value = "0", inclusive = true)
     @Digits(integer = 17, fraction = 2)
-    protected BigDecimal descuentoAdicional;
+    private BigDecimal descuentoAdicional;
 }

src/main/java/com/primefactorsolutions/invoices/config/ApplicationReadyListener.java

@@ -23,7 +23,7 @@ public class ApplicationReadyListener implements ApplicationListener<Application
 
     @Override
     @Transactional
-    public void onApplicationEvent(ApplicationReadyEvent event) {
+    public void onApplicationEvent(final ApplicationReadyEvent event) {
         var indexed = new Class[]{Client.class, Product.class};
         log.info("Indexing tables {}", Arrays.stream(indexed).toList());
         SearchSession searchSession = Search.session(entityManager);

src/main/java/com/primefactorsolutions/invoices/config/SecurityConfig.java

@@ -17,7 +17,7 @@ import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
 public class SecurityConfig extends VaadinWebSecurity {
 
     @Override
-    protected void configure(HttpSecurity http) throws Exception {
+    protected void configure(final HttpSecurity http) throws Exception {
         http.authorizeHttpRequests(auth ->
                 auth.requestMatchers(
                         AntPathRequestMatcher.antMatcher(HttpMethod.GET, "/images/*.png")).permitAll());

src/main/java/com/primefactorsolutions/invoices/model/AbstractEntity.java

@@ -22,7 +22,7 @@ public abstract class AbstractEntity {
         return id;
     }
 
-    public void setId(UUID id) {
+    public void setId(final UUID id) {
         this.id = id;
     }
 
@@ -39,7 +39,7 @@ public abstract class AbstractEntity {
     }
 
     @Override
-    public boolean equals(Object obj) {
+    public boolean equals(final Object obj) {
         if (!(obj instanceof AbstractEntity that)) {
             return false; // null or not an AbstractEntity class
         }

src/main/java/com/primefactorsolutions/invoices/model/Branch.java

@@ -21,9 +21,9 @@ public class Branch extends AbstractEntity {
     @NotNull
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999", inclusive = true)
-    protected int codigoSucursal;
+    private int codigoSucursal;
 
-    protected String cuis;
+    private String cuis;
 
-    protected String description;
+    private String description;
 }

src/main/java/com/primefactorsolutions/invoices/model/Client.java

@@ -37,37 +37,37 @@ public class Client extends AbstractEntity {
     @XmlElement(required = true, nillable = true)
     @Size(min = 1, max = 500)
     @FullTextField
-    protected String nombreRazonSocial;
+    private String nombreRazonSocial;
 
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "5", inclusive = true)
-    protected int codigoTipoDocumentoIdentidad;
+    private int codigoTipoDocumentoIdentidad;
 
     @NotNull
     @Size(min = 1, max = 20)
-    protected String numeroDocumento;
+    private String numeroDocumento;
 
     @NotNull
     @Size(min = 1, max = 500)
-    protected String direccionComprador;
+    private String direccionComprador;
 
     @NotNull
     @Size(min = 1, max = 100)
-    protected String codigoCliente;
+    private String codigoCliente;
 
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "212", inclusive = true)
-    protected int codigoPais;
+    private int codigoPais;
 
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "308", inclusive = true)
-    protected int codigoMetodoPago;
+    private int codigoMetodoPago;
 
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999999999999999", inclusive = true)
-    protected Long numeroTarjeta;
+    private Long numeroTarjeta;
 
 }

src/main/java/com/primefactorsolutions/invoices/model/Company.java

@@ -17,22 +17,22 @@ public class Company extends AbstractEntity {
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "9999999999999", inclusive = true)
-    protected long nitEmisor;
+    private long nitEmisor;
 
     @NotNull
     @Size(min = 1, max = 200)
-    protected String razonSocialEmisor;
+    private String razonSocialEmisor;
 
     @NotNull
     @Size(min = 1, max = 25)
-    protected String municipio;
+    private String municipio;
 
     @Size(min = 1, max = 25)
-    protected String telefono;
+    private String telefono;
 
     @NotNull
     @Size(min = 1, max = 500)
-    protected String direccion;
+    private String direccion;
 
     @Type(JsonType.class)
     @Column(columnDefinition = "json")

src/main/java/com/primefactorsolutions/invoices/model/Event.java

@@ -14,7 +14,7 @@ import java.util.UUID;
 @Entity
 @Setter
 @Getter
-public class Event extends AbstractEntity{
+public class Event extends AbstractEntity {
     private UUID userId;
     private UUID entityId;
     private Instant timestamp;

src/main/java/com/primefactorsolutions/invoices/model/Invoice.java

@@ -6,7 +6,6 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.validation.constraints.*;
-import jakarta.xml.bind.annotation.XmlElement;
 import lombok.Getter;
 import lombok.Setter;
 import org.hibernate.annotations.Type;
@@ -27,10 +26,10 @@ public class Invoice extends AbstractEntity {
     private InvoiceStatus status;
 
     @NotNull
-    protected LocalDateTime fechaEmision;
+    private LocalDateTime fechaEmision;
 
     @Size(min = 1, max = 500)
-    protected String nombreRazonSocial;
+    private String nombreRazonSocial;
 
     @Type(JsonType.class)
     @Column(columnDefinition = "json")

src/main/java/com/primefactorsolutions/invoices/model/Media.java

@@ -4,7 +4,6 @@ import io.hypersistence.utils.hibernate.type.json.JsonType;
 import jakarta.persistence.*;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
-import lombok.Builder;
 import lombok.Getter;
 import lombok.Setter;
 import org.hibernate.annotations.Type;
@@ -14,7 +13,7 @@ import java.util.Map;
 @Entity
 @Setter
 @Getter
-public class Media extends AbstractEntity{
+public class Media extends AbstractEntity {
 
     @NotBlank
     private String name;

src/main/java/com/primefactorsolutions/invoices/model/PointOfSale.java

@@ -21,17 +21,17 @@ public class PointOfSale extends AbstractEntity {
     @NotNull
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999", inclusive = true)
-    protected int codigoSucursal;
+    private int codigoSucursal;
 
     @DecimalMin(value = "0", inclusive = true)
     @DecimalMax(value = "9999", inclusive = true)
-    protected Integer codigoPuntoVenta;
+    private Integer codigoPuntoVenta;
 
-    protected POSType codigoTipoPuntoVenta;
+    private POSType codigoTipoPuntoVenta;
 
-    protected String cuis;
+    private String cuis;
 
-    protected String description;
+    private String description;
 
-    protected String nombrePuntoVenta;
+    private String nombrePuntoVenta;
 }

src/main/java/com/primefactorsolutions/invoices/model/Product.java

@@ -19,25 +19,25 @@ public class Product extends AbstractEntity {
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "99999999", inclusive = true)
-    protected int codigoProductoSin;
+    private int codigoProductoSin;
 
     @NotNull
     @Size(min = 1, max = 50)
-    protected String codigoProducto;
+    private String codigoProducto;
 
     @NotNull
     @Size(min = 1, max = 500)
-    protected String descripcion;
+    private String descripcion;
 
     @NotNull
     @DecimalMin(value = "1", inclusive = true)
     @DecimalMax(value = "200", inclusive = true)
-    protected int unidadMedida;
+    private int unidadMedida;
 
     @NotNull
     @DecimalMin(value = "0", inclusive = false)
     @Digits(integer = 20, fraction = 5)
-    protected BigDecimal precioUnitario;
+    private BigDecimal precioUnitario;
 
     @ManyToOne
     @JoinColumn(name = "company_id")

src/main/java/com/primefactorsolutions/invoices/model/Task.java

@@ -14,7 +14,7 @@ import java.util.Map;
 @Entity
 @Setter
 @Getter
-public class Task extends AbstractEntity{
+public class Task extends AbstractEntity {
 
     @NotBlank
     private BigInteger nitEmisor;

src/main/java/com/primefactorsolutions/invoices/model/validators/FacturaComputarizadaComercialExportacionServicioValidator.java

@@ -5,10 +5,11 @@ import com.primefactorsolutions.invoices.xsd.FacturaComputarizadaComercialExport
 
 import java.util.List;
 
-public class FacturaComputarizadaComercialExportacionServicioValidator implements InvoiceValidator<FacturaComputarizadaComercialExportacionServicio> {
+public class FacturaComputarizadaComercialExportacionServicioValidator
+        implements InvoiceValidator<FacturaComputarizadaComercialExportacionServicio> {
 
     @Override
-    public List<ValidationError> validate(FacturaComputarizadaComercialExportacionServicio invoice) {
+    public List<ValidationError> validate(final FacturaComputarizadaComercialExportacionServicio invoice) {
         return Lists.newArrayList();
     }
 }

src/main/java/com/primefactorsolutions/invoices/security/SecurityService.java

@@ -11,7 +11,7 @@ public class SecurityService {
 
     private final AuthenticationContext authenticationContext;
 
-    public SecurityService(AuthenticationContext authenticationContext) {
+    public SecurityService(final AuthenticationContext authenticationContext) {
         this.authenticationContext = authenticationContext;
     }
 

src/main/java/com/primefactorsolutions/invoices/services/ClientService.java

@@ -26,12 +26,12 @@ public class ClientService {
     private final CompanyService companyService;
 
     @Transactional
-    public List<Client> findAllClients(String code) {
+    public List<Client> findAllClients(final String code) {
         return findAllClients(code, PageRequest.of(0, 25));
     }
 
     @Transactional
-    public List<Client> findAllClients(String code, PageRequest of) {
+    public List<Client> findAllClients(final String code, final PageRequest of) {
         if (Strings.isBlank(code)) {
             return clientRepository.findAll();
         }
@@ -50,14 +50,14 @@ public class ClientService {
         return result.hits();
     }
 
-    public void saveOrUpdateClient(Client updatedClient) {
+    public void saveOrUpdateClient(final Client updatedClient) {
         updatedClient.setCompany(companyService.getCompany());
         updatedClient.setStatus(Status.ACTIVE);
 
         clientRepository.save(updatedClient);
     }
 
-    public Client getClient(UUID uuid) {
+    public Client getClient(final UUID uuid) {
         return clientRepository.findById(uuid)
                 .orElseThrow(() -> new IllegalArgumentException("Client not found"));
     }

src/main/java/com/primefactorsolutions/invoices/services/ComponentBuilder.java

@@ -13,7 +13,7 @@ import java.util.Locale;
 public class ComponentBuilder {
     private final I18NProvider i18NProvider;
 
-    public ButtonBuilder button(String text) {
+    public ButtonBuilder button(final String text) {
         return ButtonBuilder.builder().i18NProvider(i18NProvider).text(text);
     }
 
@@ -42,12 +42,12 @@ public class ComponentBuilder {
             return this;
         }
 
-        public ButtonBuilder i18NProvider(I18NProvider i18NProvider) {
+        public ButtonBuilder i18NProvider(final I18NProvider i18NProvider) {
             this.setI18NProvider(i18NProvider);
             return this;
         }
 
-        public ButtonBuilder text(String text) {
+        public ButtonBuilder text(final String text) {
             this.setText(text);
             return this;
         }

src/main/java/com/primefactorsolutions/invoices/services/InvoiceService.java

@@ -17,9 +17,11 @@ import freemarker.template.Template;
 import freemarker.template.TemplateExceptionHandler;
 import jakarta.transaction.Transactional;
 import lombok.Data;
+import lombok.Getter;
 import lombok.extern.log4j.Log4j2;
 import org.apache.pdfbox.io.MemoryUsageSetting;
 import org.apache.pdfbox.pdmodel.PDDocument;
+import org.jetbrains.annotations.NotNull;
 import org.springframework.stereotype.Service;
 
 import java.io.*;
@@ -34,6 +36,7 @@ import java.util.TimeZone;
 @Data
 @Log4j2
 public class InvoiceService {
+    @Getter
     private final Help help;
     private final InvoiceRepository invoiceRepository;
     private final MediaRepository mediaRepository;
@@ -45,9 +48,9 @@ public class InvoiceService {
     }
 
     @Transactional
-    public void sendInvoice(FacturaComputarizadaComercialExportacionServicio factura) {
+    public void sendInvoice(final FacturaComputarizadaComercialExportacionServicio factura) {
 
-        try(var os = new ByteArrayOutputStream()) {
+        try (var os = new ByteArrayOutputStream()) {
             writeAsPdf(factura, os);
             var media = new Media();
             media.setName("factura.pdf");
@@ -82,19 +85,10 @@ public class InvoiceService {
         return Invoice.class.getResourceAsStream("/pfs-invoice.html");
     }
 
-    public void writeAsPdf(FacturaComputarizadaComercialExportacionServicio factura, OutputStream out) {
-
+    public void writeAsPdf(final FacturaComputarizadaComercialExportacionServicio factura, final OutputStream out) {
         try {
             var in = getTemplate();
-            Configuration cfg = new Configuration(Configuration.VERSION_2_3_32);
-            // cfg.setDirectoryForTemplateLoading(new File("/where/you/store/templates"));
-            // Recommended settings for new projects:
-            cfg.setDefaultEncoding("UTF-8");
-            cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
-            cfg.setLogTemplateExceptions(false);
-            cfg.setWrapUncheckedExceptions(true);
-            cfg.setFallbackOnNullLoopVariable(false);
-            cfg.setSQLDateAndTimeTimeZone(TimeZone.getDefault());
+            Configuration cfg = getConfiguration();
 
             Reader reader = new InputStreamReader(in);
             Template temp = new Template("pfs-invoice", reader, cfg);
@@ -119,7 +113,17 @@ public class InvoiceService {
         }
     }
 
-    public Help getHelp() {
-        return help;
+    @NotNull
+    private static Configuration getConfiguration() {
+        Configuration cfg = new Configuration(Configuration.VERSION_2_3_32);
+        // cfg.setDirectoryForTemplateLoading(new File("/where/you/store/templates"));
+        // Recommended settings for new projects:
+        cfg.setDefaultEncoding("UTF-8");
+        cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
+        cfg.setLogTemplateExceptions(false);
+        cfg.setWrapUncheckedExceptions(true);
+        cfg.setFallbackOnNullLoopVariable(false);
+        cfg.setSQLDateAndTimeTimeZone(TimeZone.getDefault());
+        return cfg;
     }
 }

src/main/java/com/primefactorsolutions/invoices/services/MediaService.java

@@ -12,15 +12,15 @@ import java.util.List;
 public class MediaService {
     private final MediaRepository mediaRepository;
 
-    public Media findMedia(String name) {
+    public Media findMedia(final String name) {
         return mediaRepository.findAll().stream().findFirst().get();
     }
 
-    public List<Media> findAllMedia(String name) {
+    public List<Media> findAllMedia(final String name) {
         return mediaRepository.findByNameLike(name);
     }
 
-    public void saveMedia(Media media) {
+    public void saveMedia(final Media media) {
         mediaRepository.save(media);
     }
 }

src/main/java/com/primefactorsolutions/invoices/services/ProductService.java

@@ -15,18 +15,18 @@ public class ProductService {
     private final ProductRepository productRepository;
     private final CompanyService companyService;
 
-    public List<Product> findAllProducts(String name) {
+    public List<Product> findAllProducts(final String name) {
         return productRepository.findAll();
     }
 
-    public void saveOrUpdateProduct(Product product) {
+    public void saveOrUpdateProduct(final Product product) {
         var company = companyService.getCompany();
         product.setCompany(company);
         product.setStatus(Status.ACTIVE);
         productRepository.save(product);
     }
 
-    public Product getProduct(UUID uuid) {
+    public Product getProduct(final UUID uuid) {
         return productRepository.findById(uuid).get();
     }
 }

src/main/java/com/primefactorsolutions/invoices/services/UserService.java

@@ -19,15 +19,15 @@ public class UserService implements UserDetailsService {
     private final UserRepository userRepository;
     private final CompanyService companyService;
 
-    public List<User> findAllUsers(String code) {
+    public List<User> findAllUsers(final String code) {
         return userRepository.findAll();
     }
 
-    public User getUser(UUID id) {
+    public User getUser(final UUID id) {
         return userRepository.findById(id).get();
     }
 
-    public void saveOrUpdateUser(User updatedUser) {
+    public void saveOrUpdateUser(final User updatedUser) {
         if (updatedUser.getId() == null) {
             var company = companyService.getCompany();
             updatedUser.setCompany(company);
@@ -39,7 +39,7 @@ public class UserService implements UserDetailsService {
     }
 
     @Override
-    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+    public UserDetails loadUserByUsername(final String username) throws UsernameNotFoundException {
         return userRepository.getByEmail(username);
     }
 }

src/main/java/com/primefactorsolutions/invoices/utils/UiUtils.java

@@ -6,7 +6,7 @@ import lombok.experimental.UtilityClass;
 
 @UtilityClass
 public class UiUtils {
-    public static void goTo(Component component, String location) {
+    public static void goTo(final Component component, final String location) {
         component.getUI().ifPresent(ui -> ui.navigate(location));
     }
 }

src/main/java/com/primefactorsolutions/invoices/views/ClientEditView.java

@@ -30,26 +30,31 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @PageTitle("Client | PFS Facturacion")
 public class ClientEditView extends VerticalLayout implements HasUrlParameter<String> {
 
-    ClientService clientService;
-    I18NProvider i18NProvider;
-    ComponentBuilder componentBuilder;
-    GenericForm<Client> clientGenericForm;
+    private final ClientService clientService;
+    private final I18NProvider i18NProvider;
+    private final ComponentBuilder componentBuilder;
+    private GenericForm<Client> clientGenericForm;
 
-    public ClientEditView(ClientService clientService, I18NProvider i18NProvider, ComponentBuilder componentBuilder) {
+    public ClientEditView(final ClientService clientService,
+                          final I18NProvider i18NProvider,
+                          final ComponentBuilder componentBuilder) {
         this.clientService = clientService;
         this.i18NProvider = i18NProvider;
         this.componentBuilder = componentBuilder;
 
-        var client = new Client();
+        initView();
+    }
 
+    private void initView() {
+        var client = new Client();
         this.clientGenericForm = new GenericForm<>(Client.class);
         this.clientGenericForm.setBean(client);
 
         var saveButton = this.componentBuilder.button("action.save").primary().build();
         saveButton.addClickListener(c -> {
-           var updatedClient = clientGenericForm.getBean();
-           clientService.saveOrUpdateClient(updatedClient);
-           goTo(this, "clients");
+            var updatedClient = clientGenericForm.getBean();
+            clientService.saveOrUpdateClient(updatedClient);
+            goTo(this, "clients");
         });
         var cancelButton = this.componentBuilder.button("action.cancel").build();
         cancelButton.addClickListener(c -> goTo(this, "clients"));
@@ -61,7 +66,7 @@ public class ClientEditView extends VerticalLayout implements HasUrlParameter<St
     }
 
     @Override
-    public void setParameter(BeforeEvent beforeEvent, String s) {
+    public void setParameter(final BeforeEvent beforeEvent, final String s) {
         if (StringUtils.isNotBlank(s) && !"new".equals(s)) {
             var product = clientService.getClient(UUID.fromString(s));
             clientGenericForm.setBean(product);

src/main/java/com/primefactorsolutions/invoices/views/ClientListView.java

@@ -1,7 +1,6 @@
 package com.primefactorsolutions.invoices.views;
 
 import com.primefactorsolutions.invoices.model.Client;
-import com.primefactorsolutions.invoices.model.InvoiceType;
 import com.primefactorsolutions.invoices.model.Status;
 import com.primefactorsolutions.invoices.services.ClientService;
 import com.vaadin.flow.component.Component;
@@ -29,12 +28,16 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @Route(value = "clients", layout = MainLayout.class)
 @PageTitle("Facturas | PFS Facturacion")
 public class ClientListView extends VerticalLayout {
-    PagingGrid<Client> grid = new PagingGrid<>(Client.class);
-    TextField filterText = new TextField();
-    ClientService clientService;
+    private final ClientService clientService;
+    private final PagingGrid<Client> grid = new PagingGrid<>(Client.class);
+    private final TextField filterText = new TextField();
 
-    public ClientListView(ClientService clientService) {
+    public ClientListView(final ClientService clientService) {
         this.clientService = clientService;
+        initView();
+    }
+
+    private void initView() {
         addClassName("pfs-list-view");
         setSizeFull();
         configureGrid();

src/main/java/com/primefactorsolutions/invoices/views/CompanyEditView.java

@@ -8,7 +8,6 @@ import com.primefactorsolutions.invoices.views.component.GenericForm;
 import com.vaadin.flow.component.Component;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.button.ButtonVariant;
-import com.vaadin.flow.component.formlayout.FormLayout;
 import com.vaadin.flow.component.html.H4;
 import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
@@ -18,14 +17,11 @@ import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
 import com.vaadin.flow.spring.annotation.SpringComponent;
 import jakarta.annotation.security.PermitAll;
-import org.checkerframework.checker.units.qual.C;
 import org.springframework.context.annotation.Scope;
-import org.vaadin.firitin.components.textfield.VBigDecimalField;
 import org.vaadin.firitin.fields.ElementCollectionField;
 import org.vaadin.firitin.fields.EnumSelect;
 
 import java.math.BigDecimal;
-import java.util.List;
 import java.util.Locale;
 
 import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
@@ -37,21 +33,27 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @PageTitle("Compania | PFS Facturacion")
 public class CompanyEditView extends VerticalLayout {
 
-    CompanyService companyService;
+    private CompanyService companyService;
+    private I18NProvider i18NProvider;
 
-    public CompanyEditView(CompanyService companyService, I18NProvider i18NProvider) {
+    public CompanyEditView(final CompanyService companyService, final I18NProvider i18NProvider) {
         this.companyService = companyService;
+        this.i18NProvider = i18NProvider;
+        initView();
+    }
+
+    private void initView() {
         var company = this.companyService.getCompany();
 
         var companyGenericForm = new GenericForm<>(Company.class);
         companyGenericForm.setBean(company);
 
-        String text = i18NProvider.getTranslation("action.save", Locale.of("es"));
+        String text = this.i18NProvider.getTranslation("action.save", Locale.of("es"));
         var saveButton = new Button(text);
         saveButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
         saveButton.addClickListener(c -> {
-           var updatedCompany = companyGenericForm.getBean();
-           companyService.saveOrUpdateCompany(updatedCompany);
+            var updatedCompany = companyGenericForm.getBean();
+            this.companyService.saveOrUpdateCompany(updatedCompany);
         });
         var cancelButton = new Button("Cancel");
         cancelButton.addClickListener(c -> goTo(this, ""));
@@ -68,19 +70,21 @@ public class CompanyEditView extends VerticalLayout {
 
 
     private Component getCurrencyForm() {
-        ElementCollectionField<CurrencyPair> field = new ElementCollectionField<>(CurrencyPair.class, CurrencyEditor.class)
-                .withEditorInstantiator(CurrencyEditor::new);
+        ElementCollectionField<CurrencyPair> field =
+                new ElementCollectionField<>(CurrencyPair.class, CurrencyEditor.class)
+                        .withEditorInstantiator(CurrencyEditor::new);
 
-        var cp = new CurrencyPair(CurrencyPair.CurrencyType.BOB, CurrencyPair.CurrencyType.USD, BigDecimal.valueOf(7.0), BigDecimal.valueOf(6.97));
+        var cp = new CurrencyPair(CurrencyPair.CurrencyType.BOB, CurrencyPair.CurrencyType.USD,
+                BigDecimal.valueOf(7.0), BigDecimal.valueOf(6.97));
         field.setValue(Lists.newArrayList(cp));
 
         return field;
     }
 
     public static class CurrencyEditor {
-            EnumSelect<CurrencyPair.CurrencyType> base = new EnumSelect<>(CurrencyPair.CurrencyType.class);
-            EnumSelect<CurrencyPair.CurrencyType> quote = new EnumSelect<>(CurrencyPair.CurrencyType.class);
-            BigDecimalField bid = new BigDecimalField();
-            BigDecimalField ask = new BigDecimalField();
+        private final EnumSelect<CurrencyPair.CurrencyType> base = new EnumSelect<>(CurrencyPair.CurrencyType.class);
+        private final EnumSelect<CurrencyPair.CurrencyType> quote = new EnumSelect<>(CurrencyPair.CurrencyType.class);
+        private final BigDecimalField bid = new BigDecimalField();
+        private final BigDecimalField ask = new BigDecimalField();
     }
 }

src/main/java/com/primefactorsolutions/invoices/views/CustomErrorHandler.java

@@ -1,7 +1,5 @@
 package com.primefactorsolutions.invoices.views;
 
-
-import com.vaadin.flow.component.ScrollOptions;
 import com.vaadin.flow.component.Text;
 import com.vaadin.flow.component.UI;
 import com.vaadin.flow.component.button.Button;
@@ -14,22 +12,21 @@ import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.server.ErrorEvent;
 import com.vaadin.flow.server.ErrorHandler;
 import lombok.extern.log4j.Log4j2;
-import org.aspectj.weaver.ast.Not;
-import org.springframework.stereotype.Component;
 
 @Log4j2
 public class CustomErrorHandler implements ErrorHandler {
     @Override
-    public void error(ErrorEvent errorEvent) {
+    public void error(final ErrorEvent errorEvent) {
         log.error("Something wrong happened", errorEvent.getThrowable());
-        if(UI.getCurrent() != null) {
+        if (UI.getCurrent() != null) {
             UI.getCurrent().access(() -> {
                 var notification = new Notification();
                 notification.addThemeVariants(NotificationVariant.LUMO_ERROR);
                 notification.setPosition(Notification.Position.TOP_CENTER);
                 notification.setDuration(0);
-                var layout = new HorizontalLayout(new Text("An internal error has occurred." +
-                       "Contact support for assistance."), new CloseButton());
+                var layout = new HorizontalLayout(
+                        new Text("An internal error has occurred. Contact support for assistance."),
+                        new CloseButton());
                 layout.setAlignItems(FlexComponent.Alignment.CENTER);
                 notification.add(layout);
                 notification.open();

src/main/java/com/primefactorsolutions/invoices/views/InitListener.java

@@ -1,6 +1,5 @@
 package com.primefactorsolutions.invoices.views;
 
-
 import com.vaadin.flow.server.ServiceInitEvent;
 import com.vaadin.flow.server.VaadinServiceInitListener;
 import com.vaadin.flow.server.VaadinSession;
@@ -12,7 +11,7 @@ import org.springframework.stereotype.Component;
 public class InitListener implements VaadinServiceInitListener {
 
     @Override
-    public void serviceInit(ServiceInitEvent event) {
+    public void serviceInit(final ServiceInitEvent event) {
         event.getSource().addSessionInitListener(
                 initEvent -> {
                     log.info("A new Session has been initialized!");

src/main/java/com/primefactorsolutions/invoices/views/InvoiceListView.java

@@ -30,14 +30,16 @@ import java.util.List;
 @Route(value = "", layout = MainLayout.class)
 @PageTitle("Facturas | PFS Facturacion")
 public class InvoiceListView extends VerticalLayout {
-    PagingGrid<Invoice> grid = new PagingGrid<>(Invoice.class);
+    private final InvoiceService invoiceService;
+    private final PagingGrid<Invoice> grid = new PagingGrid<>(Invoice.class);
+    private final TextField filterText = new TextField();
 
-    TextField filterText = new TextField();
-
-    InvoiceService invoiceService;
-
-    public InvoiceListView(InvoiceService invoiceService) {
+    public InvoiceListView(final InvoiceService invoiceService) {
         this.invoiceService = invoiceService;
+        initView();
+    }
+
+    private void initView() {
         addClassName("list-view");
         setSizeFull();
         configureGrid();

src/main/java/com/primefactorsolutions/invoices/views/InvoicePdfView.java

@@ -18,8 +18,14 @@ import java.io.ByteArrayInputStream;
 @Route(value = "invoice-pdf", layout = MainLayout.class)
 @PageTitle("Vista | PFS Facturacion")
 public class InvoicePdfView extends Div {
+    private final MediaService mediaService;
 
-    public InvoicePdfView(MediaService mediaService) {
+    public InvoicePdfView(final MediaService mediaService) {
+        this.mediaService = mediaService;
+        initView();
+    }
+
+    private void initView() {
         var media = mediaService.findMedia("foo.pdf");
         var content = media.getContent();
         var pdfViewer = new PdfViewer();

src/main/java/com/primefactorsolutions/invoices/views/LoginView.java

@@ -16,7 +16,7 @@ public class LoginView extends VerticalLayout implements BeforeEnterObserver {
 
     private final LoginForm login = new LoginForm();
 
-    public LoginView(){
+    public LoginView() {
         addClassName("login-view");
         setSizeFull();
         setAlignItems(Alignment.CENTER);
@@ -31,7 +31,7 @@ public class LoginView extends VerticalLayout implements BeforeEnterObserver {
     @Override
     public void beforeEnter(final BeforeEnterEvent beforeEnterEvent) {
         // inform the user about an authentication error
-        if(beforeEnterEvent.getLocation()
+        if (beforeEnterEvent.getLocation()
                 .getQueryParameters()
                 .getParameters()
                 .containsKey("error")) {

src/main/java/com/primefactorsolutions/invoices/views/MainLayout.java

@@ -15,7 +15,7 @@ import org.springframework.security.core.userdetails.UserDetails;
 public class MainLayout extends AppLayout {
     private final SecurityService securityService;
 
-    public MainLayout(SecurityService securityService) {
+    public MainLayout(final SecurityService securityService) {
         this.securityService = securityService;
         createHeader();
         createDrawer();

src/main/java/com/primefactorsolutions/invoices/views/ProductEditView.java

@@ -18,7 +18,6 @@ import jakarta.annotation.security.PermitAll;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.Pair;
 import org.springframework.context.annotation.Scope;
-import org.vaadin.firitin.components.button.VButton;
 
 import java.util.List;
 import java.util.Locale;
@@ -33,13 +32,17 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @PageTitle("Product | PFS Facturacion")
 public class ProductEditView extends VerticalLayout implements HasUrlParameter<String> {
 
-    ProductService productService;
-    I18NProvider i18NProvider;
-    GenericForm<Product> productGenericForm;
+    private final ProductService productService;
+    private final I18NProvider i18NProvider;
+    private GenericForm<Product> productGenericForm;
 
-    public ProductEditView(ProductService productService, I18NProvider i18NProvider) {
+    public ProductEditView(final ProductService productService, final I18NProvider i18NProvider) {
         this.productService = productService;
         this.i18NProvider = i18NProvider;
+        initView();
+    }
+
+    private void initView() {
         var product = new Product();
 
         this.productGenericForm = new GenericForm<>(Product.class);
@@ -49,9 +52,9 @@ public class ProductEditView extends VerticalLayout implements HasUrlParameter<S
         var saveButton = new Button(text);
         saveButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
         saveButton.addClickListener(c -> {
-           var updatedProduct = productGenericForm.getBean();
-           productService.saveOrUpdateProduct(updatedProduct);
-           goTo(this, "products");
+            var updatedProduct = this.productGenericForm.getBean();
+            this.productService.saveOrUpdateProduct(updatedProduct);
+            goTo(this, "products");
         });
         var cancelButton = new Button("Cancel");
         cancelButton.addClickListener(c -> goTo(this, "products"));
@@ -63,7 +66,7 @@ public class ProductEditView extends VerticalLayout implements HasUrlParameter<S
     }
 
     @Override
-    public void setParameter(BeforeEvent beforeEvent, String s) {
+    public void setParameter(final BeforeEvent beforeEvent, final String s) {
         if (StringUtils.isNotBlank(s) && !"new".equals(s)) {
             var product = productService.getProduct(UUID.fromString(s));
             productGenericForm.setBean(product);

src/main/java/com/primefactorsolutions/invoices/views/ProductListView.java

@@ -1,6 +1,5 @@
 package com.primefactorsolutions.invoices.views;
 
-import com.primefactorsolutions.invoices.model.InvoiceType;
 import com.primefactorsolutions.invoices.model.Product;
 import com.primefactorsolutions.invoices.model.Status;
 import com.primefactorsolutions.invoices.services.ProductService;
@@ -29,12 +28,16 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @Route(value = "products", layout = MainLayout.class)
 @PageTitle("Facturas | PFS Facturacion")
 public class ProductListView extends VerticalLayout {
-    PagingGrid<Product> grid = new PagingGrid<>(Product.class);
-    TextField filterText = new TextField();
-    ProductService productService;
+    private final ProductService productService;
+    private final PagingGrid<Product> grid = new PagingGrid<>(Product.class);
+    private final TextField filterText = new TextField();
 
-    public ProductListView(ProductService productService) {
+    public ProductListView(final ProductService productService) {
         this.productService = productService;
+        initView();
+    }
+
+    private void initView() {
         addClassName("list-view");
         setSizeFull();
         configureGrid();

src/main/java/com/primefactorsolutions/invoices/views/UserEditView.java

@@ -6,8 +6,6 @@ import com.primefactorsolutions.invoices.views.component.Breadcrumbs;
 import com.primefactorsolutions.invoices.views.component.GenericForm;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.button.ButtonVariant;
-import com.vaadin.flow.component.html.Anchor;
-import com.vaadin.flow.component.html.Span;
 import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 import com.vaadin.flow.i18n.I18NProvider;
@@ -34,13 +32,17 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @PageTitle("User | PFS Facturacion")
 public class UserEditView extends VerticalLayout implements HasUrlParameter<String> {
 
-    UserService userService;
-    I18NProvider i18NProvider;
-    GenericForm<User> userGenericForm;
+    private final UserService userService;
+    private final I18NProvider i18NProvider;
+    private GenericForm<User> userGenericForm;
 
-    public UserEditView(UserService userService, I18NProvider i18NProvider) {
+    public UserEditView(final UserService userService, final I18NProvider i18NProvider) {
         this.userService = userService;
         this.i18NProvider = i18NProvider;
+        initView();
+    }
+
+    private void initView() {
         var user = new User();
 
         this.userGenericForm = new GenericForm<>(User.class);
@@ -50,8 +52,8 @@ public class UserEditView extends VerticalLayout implements HasUrlParameter<Stri
         var saveButton = new Button(text);
         saveButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
         saveButton.addClickListener(c -> {
-           var updatedUser = userGenericForm.getBean();
-           userService.saveOrUpdateUser(updatedUser);
+           var updatedUser = this.userGenericForm.getBean();
+           this.userService.saveOrUpdateUser(updatedUser);
            goTo(this, "users");
         });
         var cancelButton = new Button("Cancel");
@@ -66,7 +68,7 @@ public class UserEditView extends VerticalLayout implements HasUrlParameter<Stri
     }
 
     @Override
-    public void setParameter(BeforeEvent beforeEvent, String s) {
+    public void setParameter(final BeforeEvent beforeEvent, final String s) {
         if (StringUtils.isNotBlank(s) && !"new".equals(s)) {
             var user = userService.getUser(UUID.fromString(s));
             userGenericForm.setBean(user);

src/main/java/com/primefactorsolutions/invoices/views/UserListView.java

@@ -28,12 +28,16 @@ import java.util.List;
 @Route(value = "users", layout = MainLayout.class)
 @PageTitle("Facturas | PFS Facturacion")
 public class UserListView extends VerticalLayout {
-    PagingGrid<User> grid = new PagingGrid<>(User.class);
-    TextField filterText = new TextField();
-    UserService userService;
+    private final PagingGrid<User> grid = new PagingGrid<>(User.class);
+    private final TextField filterText = new TextField();
+    private final UserService userService;
 
-    public UserListView(UserService userService) {
+    public UserListView(final UserService userService) {
         this.userService = userService;
+        initView();
+    }
+
+    private void initView() {
         addClassName("list-view");
         setSizeFull();
         configureGrid();

src/main/java/com/primefactorsolutions/invoices/views/component/BigIntegerField.java

@@ -43,10 +43,9 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
     /**
      * Constructs an empty {@code LongField} with the given label.
      *
-     * @param label
-     *            the text to set as the label
+     * @param label the text to set as the label
      */
-    public BigIntegerField(String label) {
+    public BigIntegerField(final String label) {
         this();
         setLabel(label);
     }
@@ -55,12 +54,10 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * Constructs an empty {@code LongField} with the given label and
      * placeholder text.
      *
-     * @param label
-     *            the text to set as the label
-     * @param placeholder
-     *            the placeholder text to set
+     * @param label       the text to set as the label
+     * @param placeholder the placeholder text to set
      */
-    public BigIntegerField(String label, String placeholder) {
+    public BigIntegerField(final String label, final String placeholder) {
         this(label);
         setPlaceholder(placeholder);
     }
@@ -68,13 +65,11 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
     /**
      * Constructs an empty {@code LongField} with a value change listener.
      *
-     * @param listener
-     *            the value change listener
-     *
+     * @param listener the value change listener
      * @see #addValueChangeListener(ValueChangeListener)
      */
     public BigIntegerField(
-            ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
+            final ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
         this();
         addValueChangeListener(listener);
     }
@@ -83,16 +78,14 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * Constructs an empty {@code LongField} with a value change listener and
      * a label.
      *
-     * @param label
-     *            the text to set as the label
-     * @param listener
-     *            the value change listener
-     *
+     * @param label    the text to set as the label
+     * @param listener the value change listener
      * @see #setLabel(String)
      * @see #addValueChangeListener(ValueChangeListener)
      */
-    public BigIntegerField(String label,
-                           ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
+    public BigIntegerField(
+            final String label,
+            final ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
         this(label);
         addValueChangeListener(listener);
     }
@@ -101,19 +94,17 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * Constructs a {@code LongField} with a value change listener, a label
      * and an initial value.
      *
-     * @param label
-     *            the text to set as the label
-     * @param initialValue
-     *            the initial value
-     * @param listener
-     *            the value change listener
-     *
+     * @param label        the text to set as the label
+     * @param initialValue the initial value
+     * @param listener     the value change listener
      * @see #setLabel(String)
      * @see #setValue(Object)
      * @see #addValueChangeListener(ValueChangeListener)
      */
-    public BigIntegerField(String label, BigInteger initialValue,
-                           ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
+    public BigIntegerField(
+            final String label,
+            final BigInteger initialValue,
+            final ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
         this(label);
         setValue(initialValue);
         addValueChangeListener(listener);
@@ -123,10 +114,9 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * Sets the minimum value of the field. Entering a value which is smaller
      * than {@code min} invalidates the field.
      *
-     * @param min
-     *            the min value to set
+     * @param min the min value to set
      */
-    public void setMin(int min) {
+    public void setMin(final int min) {
         super.setMin(min);
     }
 
@@ -144,10 +134,9 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * Sets the maximum value of the field. Entering a value which is greater
      * than {@code max} invalidates the field.
      *
-     * @param max
-     *            the max value to set
+     * @param max the max value to set
      */
-    public void setMax(int max) {
+    public void setMax(final int max) {
         super.setMax(max);
     }
 
@@ -168,12 +157,10 @@ public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInt
      * invalidate the field, if the value doesn't align with the specified step
      * and {@link #setMin(int) min} (if specified by user).
      *
-     * @param step
-     *            the new step to set
-     * @throws IllegalArgumentException
-     *             if the argument is less or equal to zero.
+     * @param step the new step to set
+     * @throws IllegalArgumentException if the argument is less or equal to zero.
      */
-    public void setStep(int step) {
+    public void setStep(final int step) {
         if (step <= 0) {
             throw new IllegalArgumentException(
                     "The step cannot be less or equal to zero.");

src/main/java/com/primefactorsolutions/invoices/views/component/Breadcrumbs.java

@@ -10,15 +10,15 @@ import java.util.List;
 import java.util.stream.Stream;
 
 public class Breadcrumbs extends HorizontalLayout {
-    public Breadcrumbs(List<Pair<String, String>> parts) {
+    public Breadcrumbs(final List<Pair<String, String>> parts) {
         var components = parts.stream()
                 .flatMap(p -> {
-            if (p.getValue() == null) {
-                return Stream.of((Component)new Span(p.getKey()), (Component)new Span(">"));
-            } else {
-                return Stream.of((Component)new Anchor(p.getValue(), p.getKey()), (Component)new Span(">"));
-            }
-        }).toList();
+                    if (p.getValue() == null) {
+                        return Stream.of(new Span(p.getKey()), (Component) new Span(">"));
+                    } else {
+                        return Stream.of(new Anchor(p.getValue(), p.getKey()), (Component) new Span(">"));
+                    }
+                }).toList();
 
         if (components.size() > 1) {
             this.add(components.subList(0, components.size() - 1));

src/main/java/com/primefactorsolutions/invoices/views/component/CollectionContainer.java

@@ -12,9 +12,9 @@ import java.util.stream.Collectors;
 
 public class CollectionContainer<T> extends VerticalLayout implements Bindable<List<T>> {
 
-    private List<Bindable<T>> elements = new ArrayList<>();
+    private final List<Bindable<T>> elements = new ArrayList<>();
 
-    public CollectionContainer(Class<T> elementClazz) {
+    public CollectionContainer(final Class<T> elementClazz) {
         Button button = new Button("Add");
         button.addClickListener((ComponentEventListener<ClickEvent<Button>>) buttonClickEvent -> {
             GenericForm<T> element = new GenericForm<>(elementClazz);
@@ -30,10 +30,10 @@ public class CollectionContainer<T> extends VerticalLayout implements Bindable<L
     }
 
     @Override
-    public void setBean(Object bean) {
-       for (int i = 0; i < elements.size(); i++) {
-           elements.get(i).setBean(((List<T>)bean).get(i));
-       }
+    public void setBean(final Object bean) {
+        for (int i = 0; i < elements.size(); i++) {
+            elements.get(i).setBean(((List<T>) bean).get(i));
+        }
     }
 
     @Override

src/main/java/com/primefactorsolutions/invoices/views/component/GenericForm.java

@@ -33,29 +33,29 @@ import java.util.stream.Stream;
 import static com.primefactorsolutions.invoices.utils.TextUtils.makeLabel;
 
 public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
-    Binder<T>  binder;
-    List<Pair<String, GenericForm<?>>> inner2 = new ArrayList<>();
-    List<Pair<String, CollectionContainer<?>>> inner = new ArrayList<>();
+    private Binder<T> binder;
+    private final List<Pair<String, GenericForm<?>>> inner2 = new ArrayList<>();
+    private final List<Pair<String, CollectionContainer<?>>> inner = new ArrayList<>();
 
     @Getter(value = AccessLevel.PUBLIC)
-    Class<T> tClass;
+    private final Class<T> tClass;
 
-    boolean recursive;
+    private final boolean recursive;
 
-    public GenericForm(Class<T> tClass) {
+    public GenericForm(final Class<T> tClass) {
         this(tClass, false);
     }
 
-    public GenericForm(Class<T> tClass, boolean withDetails) {
+    public GenericForm(final Class<T> tClass, final boolean withDetails) {
         this.recursive = false;
         this.tClass = tClass;
         this.binder = new BeanValidationBinder<>(tClass);
         List<Component> content = getComponents(tClass).toList();
         FormLayout formLayout = new FormLayout();
         formLayout.setResponsiveSteps(
-                        new FormLayout.ResponsiveStep("0", 1),
-                        new FormLayout.ResponsiveStep("500px", 1),
-                        new FormLayout.ResponsiveStep("800px", 1));
+                new FormLayout.ResponsiveStep("0", 1),
+                new FormLayout.ResponsiveStep("500px", 1),
+                new FormLayout.ResponsiveStep("800px", 1));
 
         if (withDetails) {
             Details details = new Details(tClass.getName());
@@ -84,7 +84,7 @@ public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
         }
     }
 
-    public Stream<Component> getComponents(Class<?> clazz) {
+    public Stream<Component> getComponents(final Class<?> clazz) {
         return Arrays.stream(clazz.getDeclaredFields())
                 .sorted(Comparator.comparing(Field::getName))
                 .flatMap(field -> {
@@ -98,14 +98,16 @@ public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
 
                         if (field.getType().equals(String.class)) {
                             component = new TextField(label);
-                            binder.forField((TextField)component)
+                            binder.forField((TextField) component)
                                     .bind(field.getName());
-                        } else if (field.getType().equals(Integer.class) || field.getType().equals(Integer.TYPE)) {
+                        } else if (field.getType().equals(Integer.class)
+                                || field.getType().equals(Integer.TYPE)) {
                             final IntegerField formField = new IntegerField(label);
                             binder.forField(formField)
                                     .bind(field.getName());
                             component = formField;
-                        } else if (field.getType().equals(Long.class) || field.getType().equals(Long.TYPE)) {
+                        } else if (field.getType().equals(Long.class)
+                                || field.getType().equals(Long.TYPE)) {
                             final LongField formField = new LongField(label);
                             binder.forField(formField)
                                     .bind(field.getName());
@@ -115,10 +117,10 @@ public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
                             binder.forField(formField)
                                     .bind(field.getName());
                             component = formField;
-                        } else if (field.getType().equals(Double.class) ||
-                                field.getType().equals(Double.TYPE) ||
-                                field.getType().equals(Float.class) ||
-                                field.getType().equals(Float.TYPE)) {
+                        } else if (field.getType().equals(Double.class)
+                                || field.getType().equals(Double.TYPE)
+                                || field.getType().equals(Float.class)
+                                || field.getType().equals(Float.TYPE)) {
                             var formField = new NumberField(label);
                             binder.forField(formField)
                                     .bind(field.getName());
@@ -155,10 +157,10 @@ public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
 
     @Override
     @SneakyThrows
-    public void setBean(Object bean) {
+    public void setBean(final Object bean) {
         binder.setBean((T) bean);
 
-        for(Pair<String, GenericForm<?>> b: inner2) {
+        for (Pair<String, GenericForm<?>> b : inner2) {
             Object foo = tClass.getDeclaredMethod("get" + StringUtils.capitalize(b.getKey())).invoke(bean);
             if (foo == null) {
                 foo = tClass.getDeclaredField(b.getKey()).getType().getConstructor().newInstance();
@@ -172,19 +174,17 @@ public class GenericForm<T> extends VerticalLayout implements Bindable<T> {
     public T getBean() {
         T result = binder.getBean();
 
-        for(Pair<String, GenericForm<?>> b: inner2) {
+        for (Pair<String, GenericForm<?>> b : inner2) {
             Object foo = b.getValue().getBean();
             tClass.getDeclaredMethod("set" + StringUtils.capitalize(b.getKey()), b.getValue().getTClass())
                     .invoke(result, foo);
         }
 
-        for (Pair<String, CollectionContainer<?>> b: inner) {
+        for (Pair<String, CollectionContainer<?>> b : inner) {
             List<?> foo = b.getValue().getBean();
             tClass.getDeclaredMethod("set" + StringUtils.capitalize(b.getKey()), List.class).invoke(result, foo);
         }
 
         return result;
     }
-
-
 }

src/main/java/com/primefactorsolutions/invoices/views/component/LongField.java

@@ -44,7 +44,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @param label
      *            the text to set as the label
      */
-    public LongField(String label) {
+    public LongField(final String label) {
         this();
         setLabel(label);
     }
@@ -58,7 +58,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @param placeholder
      *            the placeholder text to set
      */
-    public LongField(String label, String placeholder) {
+    public LongField(final String label, final String placeholder) {
         this(label);
         setPlaceholder(placeholder);
     }
@@ -72,7 +72,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @see #addValueChangeListener(ValueChangeListener)
      */
     public LongField(
-            ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
+            final ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
         this();
         addValueChangeListener(listener);
     }
@@ -89,8 +89,8 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @see #setLabel(String)
      * @see #addValueChangeListener(ValueChangeListener)
      */
-    public LongField(String label,
-                        ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
+    public LongField(final String label,
+                        final ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
         this(label);
         addValueChangeListener(listener);
     }
@@ -110,8 +110,8 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @see #setValue(Object)
      * @see #addValueChangeListener(ValueChangeListener)
      */
-    public LongField(String label, Long initialValue,
-                        ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
+    public LongField(final String label, final Long initialValue,
+                        final ValueChangeListener<? super ComponentValueChangeEvent<LongField, Long>> listener) {
         this(label);
         setValue(initialValue);
         addValueChangeListener(listener);
@@ -124,7 +124,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @param min
      *            the min value to set
      */
-    public void setMin(int min) {
+    public void setMin(final int min) {
         super.setMin(min);
     }
 
@@ -145,7 +145,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @param max
      *            the max value to set
      */
-    public void setMax(int max) {
+    public void setMax(final int max) {
         super.setMax(max);
     }
 
@@ -171,7 +171,7 @@ public class LongField extends AbstractNumberField<LongField, Long>
      * @throws IllegalArgumentException
      *             if the argument is less or equal to zero.
      */
-    public void setStep(int step) {
+    public void setStep(final int step) {
         if (step <= 0) {
             throw new IllegalArgumentException(
                     "The step cannot be less or equal to zero.");

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/CabeceraForm.java

@@ -8,22 +8,28 @@ import com.vaadin.flow.component.textfield.IntegerField;
 import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.data.binder.BeanValidationBinder;
 import com.vaadin.flow.data.binder.Binder;
+import lombok.Getter;
 
 public class CabeceraForm<T> extends FormLayout {
-    public Binder<T> binder;
+    @Getter
+    private Binder<T> binder;
 
-    LongField nitEmisor = new LongField("nitEmisor");
-    TextField razonSocialEmisor = new TextField("razonSocialEmisor");
-    TextField municipio = new TextField("municipio");
-    TextField telefono = new TextField("telefono");
-    IntegerField codigoSucursal = new IntegerField("codigoSucursal");
-    TextField direccion = new TextField("direccion");
-    IntegerField codigoPuntoVenta = new IntegerField("codigoPuntoVenta");
-    DateTimePicker fechaEmision = new DateTimePicker("fechaEmision");
-    IntegerField codigoMoneda = new IntegerField("codigoMoneda");
-    BigDecimalField tipoCambio = new BigDecimalField("tipoCambio");
+    private final LongField nitEmisor = new LongField("nitEmisor");
+    private final TextField razonSocialEmisor = new TextField("razonSocialEmisor");
+    private final TextField municipio = new TextField("municipio");
+    private final TextField telefono = new TextField("telefono");
+    private final IntegerField codigoSucursal = new IntegerField("codigoSucursal");
+    private final TextField direccion = new TextField("direccion");
+    private final IntegerField codigoPuntoVenta = new IntegerField("codigoPuntoVenta");
+    private final DateTimePicker fechaEmision = new DateTimePicker("fechaEmision");
+    private final IntegerField codigoMoneda = new IntegerField("codigoMoneda");
+    private final BigDecimalField tipoCambio = new BigDecimalField("tipoCambio");
 
-    public CabeceraForm(Class<T> clazz) {
+    public CabeceraForm(final Class<T> clazz) {
+        initView(clazz);
+    }
+
+    private void initView(final Class<T> clazz) {
         binder = new BeanValidationBinder<>(clazz);
         binder.bindInstanceFields(this);
         setResponsiveSteps(

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/ClientForm.java

@@ -6,21 +6,27 @@ import com.vaadin.flow.component.textfield.IntegerField;
 import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.data.binder.BeanValidationBinder;
 import com.vaadin.flow.data.binder.Binder;
+import lombok.Getter;
 
 public class ClientForm<T> extends FormLayout {
-    public Binder<T> binder;
-    TextField nombreRazonSocial = new TextField("nombreRazonSocial");
-    IntegerField codigoTipoDocumentoIdentidad = new IntegerField("codigoTipoDocumentoIdentidad");
-    TextField numeroDocumento = new TextField("numeroDocumento");
-    TextField complemento = new TextField("complemento");
-    TextField direccionComprador = new TextField("direccionComprador");
-    TextField codigoCliente = new TextField("codigoCliente");
-    TextField lugarDestino = new TextField("lugarDestino");
-    IntegerField codigoPais = new IntegerField("codigoPais");
-    IntegerField codigoMetodoPago = new IntegerField("codigoMetodoPago");
-    LongField numeroTarjeta = new LongField("numeroTarjeta");
+    @Getter
+    private Binder<T> binder;
+    private final TextField nombreRazonSocial = new TextField("nombreRazonSocial");
+    private final IntegerField codigoTipoDocumentoIdentidad = new IntegerField("codigoTipoDocumentoIdentidad");
+    private final TextField numeroDocumento = new TextField("numeroDocumento");
+    private final TextField complemento = new TextField("complemento");
+    private final TextField direccionComprador = new TextField("direccionComprador");
+    private final TextField codigoCliente = new TextField("codigoCliente");
+    private final TextField lugarDestino = new TextField("lugarDestino");
+    private final IntegerField codigoPais = new IntegerField("codigoPais");
+    private final IntegerField codigoMetodoPago = new IntegerField("codigoMetodoPago");
+    private final LongField numeroTarjeta = new LongField("numeroTarjeta");
 
-    public ClientForm(Class<T> clazz) {
+    public ClientForm(final Class<T> clazz) {
+        initView(clazz);
+    }
+
+    private void initView(final Class<T> clazz) {
         binder = new BeanValidationBinder<>(clazz);
         binder.bindInstanceFields(this);
         setResponsiveSteps(
@@ -31,15 +37,15 @@ public class ClientForm<T> extends FormLayout {
         setColspan(direccionComprador, 5);
 
         add(nombreRazonSocial,
-            direccionComprador,
-            codigoTipoDocumentoIdentidad,
-            numeroDocumento,
-            complemento,
-            codigoCliente,
-            lugarDestino,
-            codigoPais,
-            codigoMetodoPago,
-            numeroTarjeta
+                direccionComprador,
+                codigoTipoDocumentoIdentidad,
+                numeroDocumento,
+                complemento,
+                codigoCliente,
+                lugarDestino,
+                codigoPais,
+                codigoMetodoPago,
+                numeroTarjeta
         );
     }
 

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/ClientInputForm.java

@@ -7,17 +7,25 @@ import com.vaadin.flow.component.combobox.ComboBox;
 import com.vaadin.flow.component.formlayout.FormLayout;
 import com.vaadin.flow.data.binder.BeanValidationBinder;
 import com.vaadin.flow.data.binder.Binder;
+import lombok.Getter;
 import org.springframework.data.domain.PageRequest;
 
 import java.util.List;
 import java.util.function.Consumer;
 
 public class ClientInputForm extends FormLayout {
-    public Binder<Client> binder;
-    ComboBox<Client> queryText = new ComboBox<>("correoElectronico o telefono");
-    List<Consumer<Client>> listeners = Lists.newArrayList();
+    @Getter
+    private Binder<Client> binder;
+    private final ClientService clientService;
+    private final ComboBox<Client> queryText = new ComboBox<>("correoElectronico o telefono");
+    private final List<Consumer<Client>> listeners = Lists.newArrayList();
 
-    public ClientInputForm(ClientService clientService) {
+    public ClientInputForm(final ClientService clientService) {
+        this.clientService = clientService;
+        initView();
+    }
+
+    private void initView() {
         binder = new BeanValidationBinder<>(Client.class);
 
         queryText.setPlaceholder("Buscar ...");
@@ -26,7 +34,7 @@ public class ClientInputForm extends FormLayout {
                 query -> {
                     var limit = Math.min(query.getPageSize(), query.getLimit());
                     var page = Math.min(query.getPage(), query.getOffset());
-                    return clientService.findAllClients(query.getFilter().orElse(""),
+                    return this.clientService.findAllClients(query.getFilter().orElse(""),
                             PageRequest.of(page, limit)).stream();
                 },
                 personSearchTerm -> personSearchTerm
@@ -36,7 +44,7 @@ public class ClientInputForm extends FormLayout {
         add(queryText);
     }
 
-    public void addListener(Consumer<Client> listener) {
+    public void addListener(final Consumer<Client> listener) {
         listeners.add(listener);
     }
 }

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/DetalleForm.java

@@ -8,23 +8,29 @@ import com.vaadin.flow.component.textfield.IntegerField;
 import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.data.binder.BeanValidationBinder;
 import com.vaadin.flow.data.binder.Binder;
+import lombok.Getter;
 
 import static com.primefactorsolutions.invoices.utils.TextUtils.makeLabel;
 
 public class DetalleForm<T> extends FormLayout {
-    Binder<T> binder;
+    @Getter
+    private Binder<T> binder;
 
-    TextField actividadEconomica = new TextField(makeLabel("actividadEconomica"));
-    TextField descripcion = new TextField("descripcion");
-    BigIntegerField cantidad = new BigIntegerField("cantidad");
-    IntegerField unidadMedida = new IntegerField("unidadMedida");
-    BigDecimalField precioUnitario = new BigDecimalField("precioUnitario");
-    BigDecimalField montoDescuento = new BigDecimalField("montoDescuento");
-    BigDecimalField subTotal = new BigDecimalField("subTotal");
-    Hr separator = new Hr();
+    private final TextField actividadEconomica = new TextField(makeLabel("actividadEconomica"));
+    private final TextField descripcion = new TextField("descripcion");
+    private final BigIntegerField cantidad = new BigIntegerField("cantidad");
+    private final IntegerField unidadMedida = new IntegerField("unidadMedida");
+    private final BigDecimalField precioUnitario = new BigDecimalField("precioUnitario");
+    private final BigDecimalField montoDescuento = new BigDecimalField("montoDescuento");
+    private final BigDecimalField subTotal = new BigDecimalField("subTotal");
+    private final Hr separator = new Hr();
 
-    DetalleForm(Class<T> clazz) {
+    DetalleForm(final Class<T> clazz) {
         super();
+        initView(clazz);
+    }
+
+    private void initView(final Class<T> clazz) {
         binder = new BeanValidationBinder<>(clazz);
         binder.bindInstanceFields(this);
         setResponsiveSteps(
@@ -35,13 +41,13 @@ public class DetalleForm<T> extends FormLayout {
         setColspan(separator, 6);
 
         add(descripcion,
-            actividadEconomica,
-            cantidad,
-            unidadMedida,
-            precioUnitario,
-            montoDescuento,
-            subTotal,
-            separator
+                actividadEconomica,
+                cantidad,
+                unidadMedida,
+                precioUnitario,
+                montoDescuento,
+                subTotal,
+                separator
         );
     }
 }

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/DetallesForm.java

@@ -13,10 +13,10 @@ import java.util.stream.Collectors;
 
 public class DetallesForm<T> extends VerticalLayout {
 
-    Class<T> clazz;
-    Supplier<T> supplier;
+    private final Class<T> clazz;
+    private final Supplier<T> supplier;
 
-    public DetallesForm(Class<T> clazz, Supplier<T> supplier) {
+    public DetallesForm(final Class<T> clazz, final Supplier<T> supplier) {
         this.clazz = clazz;
         this.supplier = supplier;
         addDetalle();
@@ -26,9 +26,9 @@ public class DetallesForm<T> extends VerticalLayout {
         var content = new VerticalLayout();
         var value = supplier.get();
         var detalle = new DetalleForm<>(clazz);
-        detalle.binder.setBean(value);
+        detalle.getBinder().setBean(value);
 
-        detalle.binder.addValueChangeListener(v -> {
+        detalle.getBinder().addValueChangeListener(v -> {
             fireEvent(new ChangeEvent(this, true));
         });
 
@@ -40,15 +40,13 @@ public class DetallesForm<T> extends VerticalLayout {
         add(content);
     }
 
-
-
     public List<T> getValues() {
         return getChildren()
                 .flatMap(d -> {
                     return d.getChildren()
                             .map(c -> {
                                 if (c instanceof DetalleForm) {
-                                    return ((DetalleForm<T>) c).binder.getBean();
+                                    return ((DetalleForm<T>) c).getBinder().getBean();
                                 } else {
                                     return null;
                                 }
@@ -59,14 +57,14 @@ public class DetallesForm<T> extends VerticalLayout {
     }
 
     public Registration addChangeListener(
-            ComponentEventListener<DetallesForm.ChangeEvent> listener) {
+            final ComponentEventListener<DetallesForm.ChangeEvent> listener) {
         return addListener(DetallesForm.ChangeEvent.class, listener);
     }
 
     public static class ChangeEvent
             extends ComponentEvent<DetallesForm<?>> {
-        public ChangeEvent(DetallesForm source,
-                           boolean fromClient) {
+        public ChangeEvent(final DetallesForm source,
+                           final boolean fromClient) {
             super(source, fromClient);
         }
     }

src/main/java/com/primefactorsolutions/invoices/views/component/invoice/TotalesForm.java

@@ -5,15 +5,22 @@ import com.vaadin.flow.component.textfield.BigDecimalField;
 import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.data.binder.BeanValidationBinder;
 import com.vaadin.flow.data.binder.Binder;
+import lombok.Getter;
 
 public class TotalesForm<T> extends FormLayout {
-    public Binder<T> binder;
-    BigDecimalField montoTotal = new BigDecimalField("montoTotal");
-    BigDecimalField montoTotalSujetoIva = new BigDecimalField("montoTotalSujetoIva");
-    BigDecimalField montoTotalMoneda = new BigDecimalField("montoTotalMoneda");
-    TextField informacionAdicional = new TextField("informacionAdicional");
-    BigDecimalField descuentoAdicional = new BigDecimalField("descuentoAdicional");
-    public TotalesForm(Class<T> clazz) {
+    @Getter
+    private Binder<T> binder;
+    private final BigDecimalField montoTotal = new BigDecimalField("montoTotal");
+    private final BigDecimalField montoTotalSujetoIva = new BigDecimalField("montoTotalSujetoIva");
+    private final BigDecimalField montoTotalMoneda = new BigDecimalField("montoTotalMoneda");
+    private final TextField informacionAdicional = new TextField("informacionAdicional");
+    private final BigDecimalField descuentoAdicional = new BigDecimalField("descuentoAdicional");
+
+    public TotalesForm(final Class<T> clazz) {
+        initView(clazz);
+    }
+
+    private void initView(final Class<T> clazz) {
         binder = new BeanValidationBinder<>(clazz);
         binder.bindInstanceFields(this);
 

src/main/java/com/primefactorsolutions/invoices/views/invoices/FacturaComputarizadaComercialExportacionesServicioEditView.java

@@ -33,8 +33,6 @@ import org.jetbrains.annotations.NotNull;
 import org.springframework.context.annotation.Scope;
 
 import java.math.BigDecimal;
-import java.util.List;
-import java.util.stream.Stream;
 
 import static com.primefactorsolutions.invoices.utils.TextUtils.makeLabel;
 import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
@@ -45,34 +43,38 @@ import static com.primefactorsolutions.invoices.utils.UiUtils.goTo;
 @Route(value = "edit-invoice", layout = MainLayout.class)
 @PageTitle("Factura | Editar")
 public class FacturaComputarizadaComercialExportacionesServicioEditView extends VerticalLayout {
-    private final CabeceraForm<CabeceraDTO> cabeceraForm;
-    private final ClientForm<ClientDTO> clientForm;
-    private final TotalesForm<TotalesDTO> totalesForm;
-    private final DetallesForm<DetalleDTO> detalleForm;
-    private final Button save = new Button("Crear");
-    private final Button close = new Button("Cancelar");
-    private final Dialog dialog = new Dialog();
     private final InvoiceService invoiceService;
     private final ClientService clientService;
     private final CompanyService companyService;
+    private final Button save = new Button("Crear");
+    private final Button close = new Button("Cancelar");
+    private final Dialog dialog = new Dialog();
+    private CabeceraForm<CabeceraDTO> cabeceraForm;
+    private ClientForm<ClientDTO> clientForm;
+    private TotalesForm<TotalesDTO> totalesForm;
+    private DetallesForm<DetalleDTO> detalleForm;
 
     public FacturaComputarizadaComercialExportacionesServicioEditView(
-            InvoiceService invoiceService,
-            ClientService clientService,
-            CompanyService companyService) {
+            final InvoiceService invoiceService,
+            final ClientService clientService,
+            final CompanyService companyService) {
         this.invoiceService = invoiceService;
         this.clientService = clientService;
         this.companyService = companyService;
 
-        var company = companyService.getCompany();
+        initView();
+    }
+
+    private void initView() {
+        var company = this.companyService.getCompany();
         var cabeceraDTO = CabeceraMapper.INSTANCE.cabeceraDtoFromCompany(company);
         this.cabeceraForm = new CabeceraForm<>(CabeceraDTO.class);
-        this.cabeceraForm.binder.setBean(cabeceraDTO);
+        this.cabeceraForm.getBinder().setBean(cabeceraDTO);
 
         var clientDTO = new ClientDTO();
 
         this.clientForm = new ClientForm<>(ClientDTO.class);
-        this.clientForm.binder.setBean(clientDTO);
+        this.clientForm.getBinder().setBean(clientDTO);
 
         this.detalleForm = new DetallesForm<>(DetalleDTO.class, DetalleDTO::new);
 
@@ -80,7 +82,7 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
         totalesDTO.setInformacionAdicional("Ninguno");
         totalesDTO.setDescuentoAdicional(BigDecimal.valueOf(0));
         this.totalesForm = new TotalesForm<>(TotalesDTO.class);
-        this.totalesForm.binder.setBean(totalesDTO);
+        this.totalesForm.getBinder().setBean(totalesDTO);
 
         var emisorDetails = getEmisorDetails(cabeceraDTO);
         var clienteDetails = getClienteDetails();
@@ -111,20 +113,20 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
 
         this.detalleForm.addChangeListener(c -> {
             var values = this.detalleForm.getValues();
-            var currentTotales = this.totalesForm.binder.getBean();
+            var currentTotales = this.totalesForm.getBinder().getBean();
 
             var total = values.stream()
                     .map(DetalleDTO::getSubTotal)
                     .map(b -> b == null ? new BigDecimal(0) : b)
                     .reduce(BigDecimal::add).orElse(new BigDecimal(0));
 
-            System.out.println(">>>>>>>>" + total);
             currentTotales.setMontoTotalMoneda(total);
             currentTotales.setMontoTotal((total.subtract(currentTotales.getDescuentoAdicional()))
                     .multiply(BigDecimal.valueOf(7.0)));
-            currentTotales.setMontoTotalSujetoIva(currentTotales.getMontoTotal().subtract(currentTotales.getDescuentoAdicional()));
+            currentTotales.setMontoTotalSujetoIva(currentTotales.getMontoTotal()
+                    .subtract(currentTotales.getDescuentoAdicional()));
 
-            this.totalesForm.binder.setBean(currentTotales);
+            this.totalesForm.getBinder().setBean(currentTotales);
         });
 
         return detalleDetails;
@@ -135,7 +137,7 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
         ClientInputForm clientInputForm = new ClientInputForm(clientService);
         clientInputForm.addListener(c -> {
             var selectedClientDTO = ClientMapper.INSTANCE.clientDtoFromClient(c);
-            this.clientForm.binder.setBean(selectedClientDTO);
+            this.clientForm.getBinder().setBean(selectedClientDTO);
             this.clientForm.setVisible(true);
         });
 
@@ -154,7 +156,7 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
             if (e.isOpened()) {
                 clienteText.setText("Cliente");
             } else {
-                var clienteDTO = clientForm.binder.getBean();
+                var clienteDTO = clientForm.getBinder().getBean();
                 clienteText.setText("Cliente (" + clienteDTO.getNombreRazonSocial() + ")");
             }
         });
@@ -171,7 +173,7 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
     }
 
     @NotNull
-    private Details getEmisorDetails(CabeceraDTO cabeceraDTO) {
+    private Details getEmisorDetails(final CabeceraDTO cabeceraDTO) {
         var emisorText = new Text("Emisor");
         var emisorSummary = new HorizontalLayout();
         emisorSummary.setSpacing(false);
@@ -204,9 +206,9 @@ public class FacturaComputarizadaComercialExportacionesServicioEditView extends
 
         this.save.addClickListener(e -> {
             var factura = new FacturaComputarizadaComercialExportacionServicio();
-            var cabecera = CabeceraMapper.INSTANCE.cabeceraFromDtos(this.cabeceraForm.binder.getBean(),
-                    this.clientForm.binder.getBean(),
-                    this.totalesForm.binder.getBean());
+            var cabecera = CabeceraMapper.INSTANCE.cabeceraFromDtos(this.cabeceraForm.getBinder().getBean(),
+                    this.clientForm.getBinder().getBean(),
+                    this.totalesForm.getBinder().getBean());
             var detalles = detalleForm.getValues().stream()
                     .map(DetalleMapper.INSTANCE::detalleFromDto)
                     .toList();

src/main/java/com/primefactorsolutions/invoices/xml/adapters/DateTimeXmlAdapter.java

@@ -11,12 +11,12 @@ import java.time.ZoneOffset;
 public class DateTimeXmlAdapter extends XmlAdapter<String, LocalDateTime> {
 
     @Override
-    public String marshal(LocalDateTime v) throws Exception {
+    public String marshal(final LocalDateTime v) throws Exception {
         return v.toInstant(ZoneOffset.UTC).toString();
     }
 
     @Override
-    public LocalDateTime unmarshal(String v) throws Exception {
+    public LocalDateTime unmarshal(final String v) throws Exception {
         return LocalDateTime.ofInstant(Instant.parse(v), ZoneId.of("UTC"));
     }
 }

src/main/java/com/primefactorsolutions/invoices/xml/adapters/DateXmlAdapter.java

@@ -11,14 +11,14 @@ public class DateXmlAdapter extends XmlAdapter<String, Date> {
     private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 
     @Override
-    public String marshal(Date v) throws Exception {
+    public String marshal(final Date v) throws Exception {
         synchronized (dateFormat) {
             return dateFormat.format(v);
         }
     }
 
     @Override
-    public Date unmarshal(String v) throws Exception {
+    public Date unmarshal(final String v) throws Exception {
         synchronized (dateFormat) {
             return dateFormat.parse(v);
         }

src/main/resources/checkstyle.xml

@@ -0,0 +1,195 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+        "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+
+  Checkstyle configuration that checks the sun coding conventions from:
+
+    - the Java Language Specification at
+      https://docs.oracle.com/javase/specs/jls/se11/html/index.html
+
+    - the Sun Code Conventions at https://www.oracle.com/java/technologies/javase/codeconventions-contents.html
+
+    - the Javadoc guidelines at
+      https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html
+
+    - the JDK Api documentation https://docs.oracle.com/en/java/javase/11/
+
+    - some best practices
+
+  Checkstyle is very configurable. Be sure to read the documentation at
+  https://checkstyle.org (or in your downloaded distribution).
+
+  Most Checks are configurable, be sure to consult the documentation.
+
+  To completely disable a check, just comment it out or delete it from the file.
+  To suppress certain violations please review suppression filters.
+
+  Finally, it is worth reading the documentation.
+
+-->
+
+<module name="Checker">
+    <!--
+        If you set the basedir property below, then all reported file
+        names will be relative to the specified directory. See
+        https://checkstyle.org/config.html#Checker
+
+        <property name="basedir" value="${basedir}"/>
+    -->
+    <property name="severity" value="error"/>
+
+    <property name="fileExtensions" value="java, properties, xml"/>
+
+    <!-- Excludes all 'module-info.java' files              -->
+    <!-- See https://checkstyle.org/config_filefilters.html -->
+    <module name="BeforeExecutionExclusionFileFilter">
+        <property name="fileNamePattern" value="module\-info\.java$"/>
+    </module>
+
+    <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
+    <module name="SuppressionFilter">
+        <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
+                  default="checkstyle-suppressions.xml" />
+        <property name="optional" value="true"/>
+    </module>
+
+    <!-- Checks that a package-info.java file exists for each package.     -->
+    <!-- See https://checkstyle.org/config_javadoc.html#JavadocPackage -->
+    <!-- <module name="JavadocPackage"/> -->
+
+    <!-- Checks whether files end with a new line.                        -->
+    <!-- See https://checkstyle.org/config_misc.html#NewlineAtEndOfFile -->
+    <!-- <module name="NewlineAtEndOfFile"/> -->
+
+    <!-- Checks that property files contain the same keys.         -->
+    <!-- See https://checkstyle.org/config_misc.html#Translation -->
+    <module name="Translation"/>
+
+    <!-- Checks for Size Violations.                    -->
+    <!-- See https://checkstyle.org/config_sizes.html -->
+    <module name="FileLength"/>
+    <module name="LineLength">
+        <property name="max" value="120"/>
+        <property name="fileExtensions" value="java"/>
+    </module>
+
+    <!-- Checks for whitespace                               -->
+    <!-- See https://checkstyle.org/config_whitespace.html -->
+    <module name="FileTabCharacter"/>
+
+    <!-- Miscellaneous other checks.                   -->
+    <!-- See https://checkstyle.org/config_misc.html -->
+    <module name="RegexpSingleline">
+        <property name="format" value="\s+$"/>
+        <property name="minimum" value="0"/>
+        <property name="maximum" value="0"/>
+        <property name="message" value="Line has trailing spaces."/>
+    </module>
+
+    <!-- Checks for Headers                                -->
+    <!-- See https://checkstyle.org/config_header.html   -->
+    <!-- <module name="Header"> -->
+    <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
+    <!--   <property name="fileExtensions" value="java"/> -->
+    <!-- </module> -->
+
+    <module name="TreeWalker">
+
+        <!-- Checks for Javadoc comments.                     -->
+        <!-- See https://checkstyle.org/config_javadoc.html -->
+        <module name="InvalidJavadocPosition"/>
+
+        <!-- Checks for Naming Conventions.                  -->
+        <!-- See https://checkstyle.org/config_naming.html -->
+        <module name="ConstantName"/>
+        <module name="LocalFinalVariableName"/>
+        <module name="LocalVariableName"/>
+        <module name="MemberName"/>
+        <module name="MethodName"/>
+        <module name="PackageName"/>
+        <module name="ParameterName"/>
+        <module name="StaticVariableName"/>
+        <module name="TypeName"/>
+
+        <!-- Checks for imports                              -->
+        <!-- See https://checkstyle.org/config_imports.html -->
+        <!-- <module name="AvoidStarImport"/> -->
+
+        <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
+        <module name="RedundantImport"/>
+        <module name="UnusedImports">
+            <property name="processJavadoc" value="false"/>
+        </module>
+
+        <!-- Checks for Size Violations.                    -->
+        <!-- See https://checkstyle.org/config_sizes.html -->
+        <module name="MethodLength"/>
+        <module name="ParameterNumber"/>
+
+        <!-- Checks for whitespace                               -->
+        <!-- See https://checkstyle.org/config_whitespace.html -->
+        <module name="EmptyForIteratorPad"/>
+        <module name="GenericWhitespace"/>
+        <module name="MethodParamPad"/>
+        <module name="NoWhitespaceAfter"/>
+        <module name="NoWhitespaceBefore"/>
+        <module name="OperatorWrap"/>
+        <module name="ParenPad"/>
+        <module name="TypecastParenPad"/>
+        <module name="WhitespaceAfter"/>
+        <module name="WhitespaceAround"/>
+
+        <!-- Modifier Checks                                    -->
+        <!-- See https://checkstyle.org/config_modifier.html -->
+        <module name="ModifierOrder"/>
+        <module name="RedundantModifier"/>
+
+        <!-- Checks for blocks. You know, those {}'s         -->
+        <!-- See https://checkstyle.org/config_blocks.html -->
+        <module name="AvoidNestedBlocks"/>
+        <module name="EmptyBlock"/>
+        <module name="LeftCurly"/>
+        <module name="NeedBraces"/>
+        <module name="RightCurly"/>
+
+        <!-- Checks for common coding problems               -->
+        <!-- See https://checkstyle.org/config_coding.html -->
+        <module name="EmptyStatement"/>
+        <module name="EqualsHashCode"/>
+        <!-- <module name="HiddenField"/> -->
+        <module name="IllegalInstantiation"/>
+        <module name="InnerAssignment"/>
+        <!-- <module name="MagicNumber"/> -->
+        <module name="MissingSwitchDefault"/>
+        <module name="MultipleVariableDeclarations"/>
+        <module name="SimplifyBooleanExpression"/>
+        <module name="SimplifyBooleanReturn"/>
+
+        <!-- Checks for class design                         -->
+        <!-- See https://checkstyle.org/config_design.html -->
+        <!--<module name="DesignForExtension"/>-->
+        <module name="FinalClass"/>
+        <!-- <module name="HideUtilityClassConstructor"/>-->
+        <module name="InterfaceIsType"/>
+        <module name="VisibilityModifier"/>
+
+        <!-- Miscellaneous other checks.                   -->
+        <!-- See https://checkstyle.org/config_misc.html -->
+        <module name="ArrayTypeStyle"/>
+        <module name="FinalParameters"/>
+        <module name="TodoComment"/>
+        <module name="UpperEll"/>
+
+        <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
+        <module name="SuppressionXpathFilter">
+            <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}"
+                      default="checkstyle-xpath-suppressions.xml" />
+            <property name="optional" value="true"/>
+        </module>
+
+    </module>
+
+</module>

src/test/java/com/primefactorsolutions/invoices/services/ClientServiceTest.java

@@ -0,0 +1,22 @@
+package com.primefactorsolutions.invoices.services;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ClientServiceTest {
+
+    @BeforeEach
+    void setUp() {
+    }
+
+    @AfterEach
+    void tearDown() {
+    }
+
+    @Test
+    void getClient() {
+    }
+}