Issue
I try to add mapstruct mapper in my Spring project.
I have a User entity. I need to show a list of users in the admin panel. For this, I did DTO UserForAdmin, mapper UserMapper and rest controller AdminRestController. When I try to get UserMapper I get errors.
- Mappers.getMapper(UserMapper.class)
I get error
java.lang.ClassNotFoundException: Cannot find implementation for ru.project.mapper.UserMapper
- Autowired
I get error
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2019-07-17 15:47:07.886 ERROR 13652 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
*************************** APPLICATION FAILED TO START
Description:
Field userMapper in ru.project.controller.rest.AdminRestController required a bean of type 'ru.project.mapper.UserMapper' that could not be found.
The injection point has the following annotations: - @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'ru.project.mapper.UserMapper' in your configuration.
Here my source code.
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 http://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>2.1.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>ru.project</groupId>
<artifactId>project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>project</name>
<description>The project is project of resourse for investors.</description>
<properties>
<java.version>12</java.version>
<org.mapstruct.version>1.3.0.Final</org.mapstruct.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-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity5</artifactId>
</dependency>
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>2.3.5</version>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>${org.mapstruct.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</path>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${org.mapstruct.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
</project>
My interface UserMapper:
package ru.project.mapper;
import java.util.List;
import org.mapstruct.Mapper;
import ru.project.domain.User;
import ru.project.dto.UserForAdmin;
@Mapper
//@Mapper(componentModel = "spring")
public interface UserMapper {
UserForAdmin UserToUserForAdmin(User user);
List<UserForAdmin> UserListToUserForAdminList(List<User> user);
}
My RestController:
package ru.project.controller.rest;
import java.util.List;
import org.mapstruct.factory.Mappers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import ru.project.dto.UserForAdmin;
import ru.project.mapper.UserMapper;
import ru.project.service.UserService;
@RestController
public class AdminRestController {
@Autowired
private UserService userService;
//@Autowired
//private UserMapper userMapper;
@GetMapping("/admin/users")
public List<UserForAdmin> findAllUsers(){
UserMapper userMapper = Mappers.getMapper(UserMapper.class);
return userMapper.UserListToUserForAdminList(userService.findAll());
}
}
I would like to use Awtowired.
Solution
You need to use @Mapper(componentModel="spring")
package ru.project.mapper;
import java.util.List;
import org.mapstruct.Mapper;
import ru.project.domain.User;
import ru.project.dto.UserForAdmin;
@Mapper(componentModel = "spring")
public interface UserMapper {
UserForAdmin UserToUserForAdmin(User user);
List<UserForAdmin> UserListToUserForAdminList(List<User> user);
}
and use below in AdminRestController
@Autowired
private UserMapper userMapper;
And i am assuming that User and UserForAdmin have same field names
After this run mvn clean compile and sources will be generated
Answered By - Harish Gupta
Answer Checked By - David Marino (JavaFixing Volunteer)
