Practical example of Hexagonal architecture - add project

EmpServiceApp/src/com/baeldung/employee/config/AppConfig.java

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+package com.baeldung.employee.config;
+
+import javax.persistence.EntityManagerFactory;
+import javax.sql.DataSource;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.TransactionManager;
+
+@Configuration
+@EnableJpaRepositories(basePackages = "com.baeldung.employee.data", entityManagerFactoryRef = "emf")
+@ComponentScan(basePackages = "com.baeldung.employee")
+public class AppConfig {
+
+    @Bean
+    public DataSource h2DataSource() {
+
+        EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();
+        EmbeddedDatabase db = builder.setType(EmbeddedDatabaseType.H2)
+            .addScript("createEmployeeTable.sql")
+            .build();
+        return db;
+
+    }
+
+    @Bean
+    public ModelMapper mapper() {
+
+        return new ModelMapper();
+    }
+
+    /*    @Bean
+    public ObjectMapper objectMapper() {
+    
+        ObjectMapper mapper = new ObjectMapper();
+        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);
+    
+        return mapper;
+    }
+    */
+
+    @Bean(name = "emf")
+    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
+
+        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+
+        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
+        factory.setJpaVendorAdapter(vendorAdapter);
+        factory.setPackagesToScan("com.baeldung.employee");
+        factory.setDataSource(h2DataSource());
+        // factory.setJpaProperties(jpaProperties());
+
+        return factory;
+    }
+
+    @Bean
+    public TransactionManager jpaTransactionManager(EntityManagerFactory emf) {
+        JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(emf);
+        return transactionManager;
+    }
+
+}

EmpServiceApp/src/com/baeldung/employee/config/ApplicationInitializer.java

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+package com.baeldung.employee.config;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRegistration;
+
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+public class ApplicationInitializer implements WebApplicationInitializer {
+
+    @Override
+    public void onStartup(ServletContext servletContext) throws ServletException {
+
+        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
+        context.register(AppConfig.class);
+
+        servletContext.addListener(new ContextLoaderListener(context));
+
+        // Create DispatcherServlet
+
+        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("EmployeeSpringApp", new DispatcherServlet());
+        dispatcher.setLoadOnStartup(1);
+        dispatcher.addMapping("/app");
+
+    }
+}

EmpServiceApp/src/com/baeldung/employee/data/EmployeeDataAdapter.java

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+package com.baeldung.employee.data;
+
+import com.baeldung.employee.dto.EmployeeDTO;
+
+public interface EmployeeDataAdapter {
+
+    void addEmployee(EmployeeDTO emp);
+
+}

EmpServiceApp/src/com/baeldung/employee/data/EmployeeDataAdapterImpl.java

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+package com.baeldung.employee.data;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.baeldung.employee.domain.Employee;
+import com.baeldung.employee.dto.EmployeeDTO;
+
+@Component
+public class EmployeeDataAdapterImpl implements EmployeeDataAdapter {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Autowired
+    private ModelMapper modelMapper;
+
+    @Override
+    public void addEmployee(EmployeeDTO emp) {
+
+        em.persist(modelMapper.map(emp, Employee.class));
+
+    }
+}

EmpServiceApp/src/com/baeldung/employee/data/EmployeeRepo.java

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+package com.baeldung.employee.data;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.baeldung.employee.domain.Employee;
+
+public interface EmployeeRepo extends JpaRepository<Employee, Long> {
+
+}

EmpServiceApp/src/com/baeldung/employee/domain/Employee.java

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+package com.baeldung.employee.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "EMPLOYEE")
+public class Employee {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private int id;
+
+    private String name;
+
+    public Employee() {
+    }
+
+    public Employee(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    // Standard constructors, getters and setters
+}

EmpServiceApp/src/com/baeldung/employee/dto/EmployeeDTO.java

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+package com.baeldung.employee.dto;
+
+public class EmployeeDTO {
+
+    private long id;
+    private String name;
+
+    // Standard constructors, getters and setters
+}

EmpServiceApp/src/com/baeldung/employee/service/EmployeeController.java

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+package com.baeldung.employee.service;
+
+import java.net.URI;
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+
+import com.baeldung.employee.domain.Employee;
+
+@RestController
+public class EmployeeController {
+
+    @Autowired
+    private EmployeeService empService;
+
+    @GetMapping(value = "/", produces = MediaType.TEXT_HTML_VALUE)
+    public String home() {
+
+        return "This is employee app page";
+    }
+
+    @PostMapping(path = "/employees", consumes = "application/json", produces = "application/json")
+    public ResponseEntity<Object> addEmployee(@RequestBody Map<String, String> empBody) {
+
+        String id = empBody.get("id");
+        String name = empBody.get("name");
+
+        Employee emp = new Employee(Integer.valueOf(id), name);
+        empService.addEmployee(emp);
+
+        // Create resource uri
+        URI uri = ServletUriComponentsBuilder.fromCurrentRequest()
+            .buildAndExpand(emp.getId())
+            .toUri();
+
+        // Send uri in response
+        return ResponseEntity.created(uri)
+            .build();
+    }
+}

EmpServiceApp/src/com/baeldung/employee/service/EmployeeService.java

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+package com.baeldung.employee.service;
+
+import com.baeldung.employee.domain.Employee;
+
+public interface EmployeeService {
+
+    void addEmployee(Employee emp);
+}

EmpServiceApp/src/com/baeldung/employee/service/EmployeeServiceImpl.java

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+package com.baeldung.employee.service;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.employee.data.EmployeeDataAdapter;
+import com.baeldung.employee.domain.Employee;
+import com.baeldung.employee.dto.EmployeeDTO;
+
+@Service
+public class EmployeeServiceImpl implements EmployeeService {
+
+    @Autowired
+    private EmployeeDataAdapter employeeDataAdapter;
+
+    @Autowired
+    private ModelMapper modelMapper;
+
+    @Override
+    public void addEmployee(Employee emp) {
+        employeeDataAdapter.addEmployee(modelMapper.map(emp, EmployeeDTO.class));
+    }
+
+}

EmpServiceApp/src/createEmployeeTable.sql

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+DROP TABLE IF EXISTS EMPLOYEE;
+
+CREATE TABLE EMPLOYEE (
+
+  ID IDENTITY PRIMARY KEY,
+  NAME VARCHAR(64) NOT NULL,
+
+);
+
+INSERT INTO EMPLOYEE (ID, NAME) VALUES (10, 'EMP 10');
+INSERT INTO EMPLOYEE (ID, NAME) VALUES (20, 'EMP 20');

EmpServiceApp/web/WEB-INF/applicationContext.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns:context="http://www.springframework.org/schema/context"
+       xmlns="http://www.springframework.org/schema/beans"
+       xsi:schemaLocation="http://www.springframework.org/schema/beans
+    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
+    http://www.springframework.org/schema/context
+    http://www.springframework.org/schema/context/spring-context-4.1.xsd">
+
+    <context:component-scan base-package="com.baeldung.employee.*"/>
+
+</beans>

EmpServiceApp/web/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
+         version="4.0">
+    <display-name>Employee Spring App</display-name>
+
+    <listener>
+        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
+    </listener>
+
+    <servlet>
+        <servlet-name>EmployeeSpringApp</servlet-name>
+        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+        <init-param>
+            <param-name>contextConfigLocation</param-name>
+            <param-value>/WEB-INF/applicationContext.xml</param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>EmployeeSpringApp</servlet-name>
+        <url-pattern>/*</url-pattern>
+    </servlet-mapping>
+</web-app>