This is my User class.
@Entity
@Table(name = "user_table")
@Data
public class User {
@Id
private Long id;
private String userName;
private String password;
}
This is my UserDto, I know the fields name are same. But I'm trying to understand the concept.
@Data
public class UserDto {
private Long id;
private String userName;
private String password;
}
I wanted to use MapStruct for to Entity-Dto and Dto-Entity convertions. So I've wrote a base interface like EntityMapper.
public interface EntityMapper<D, E> {
E toEntity(D dto);
D toDto(E entity);
List<E> toEntity(List<D> dtoList);
List<D> toDto(List<E> entityList);
}
Then I created a new Interface which is extends EntityMapper .
@Mapper(componentModel = "spring", uses = UserService.class)
public interface UserMapper extends EntityMapper<UserDto , User> {
@Mapping(source = "id", target = "id")
@Mapping(source = "userName", target = "userName")
@Mapping(source = "password", target = "password")
@Override
User toEntity(UserDto dto);
@Override
UserDto toDto(User entity);
@Override
List<User> toEntity(List<UserDto> dtoList);
@Override
List<UserDto> toDto(List<User> entityList);
This my controller
@RestController
@RequestMapping("/v1/api/users")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
@PostMapping("/save")
public ResponseEntity<UserDto> saveUser(@RequestBody UserDto userDto){
UserDto res = userService.saveUser(userDto);
return ResponseEntity.ok(res);
}
}
And finally when I try to create a new service class and use a reference from UserMapper interface. The spring tells me
Could not autowire. No beans of 'UserMapper' type found.
for this line
private final UserMapper userMapper;
And this is my whole Service Class. When I delete the @Service annotation the error is fixing. But this is a service class so I have to put @Service annotation I think.
I've tried to add @Component annotation to UserMapper. But application failed to start.
@Service
public class UserService {
private final UserRepository userRepository;
private final UserMapper userMapper;
public UserService(UserRepository userRepository, UserMapper userMapper) {
this.userRepository = userRepository;
this.userMapper = userMapper;
}
public UserDto saveUser(UserDto userDto){
User user = userMapper.toEntity(userDto);
user = userRepository.save(user);
UserDto res = userMapper.toDto(user);
return res;
}
}
Here is the pom.xml.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.6</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>AprilSevenApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>AprilSevenApp</name>
<description>AprilSevenApp</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mapstruct/mapstruct -->
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>1.4.2.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.dot</groupId>
<artifactId>util</artifactId>
<version>0.2.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
I just added to this dependency for mapstruct. If is there a different dependencies that I have to add, I did'nt know.
<!-- https://mvnrepository.com/artifact/org.mapstruct/mapstruct --
>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>1.4.2.Final</version>
</dependency>
An annotation processor must be added to the compiler plugin in order to generate an implementation for UserMapper interface.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>1.4.2.Final</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
Also I don't think can remove uses = UserService.class, considering that UserService is not a Mapper. Here is the official documentation of uses annotation parameter:
Other mapper types used by this mapper. May be hand-written classes or other mappers generated by MapStruct. No cycle between generated mapper classes must be created.