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Spring Boot看不到我的Mapstruct映射器

分类：编程问答

如何解决Spring Boot看不到我的Mapstruct映射器

我定义了映射器，但是Spring Boot无法检测到它。我好几天都找不到问题了。请帮忙。在IDEA和Netbeans上进行过尝试。试图在this thread的主类上添加一些注释。

说明：

中的构造函数的参数1 com.example.springMysqLelastic.service.impl.UserService需要一个 'com.example.springMysqLelastic.mapper.UserMapper'类型的Bean 找不到。

操作：

考虑定义类型的bean 您的'com.example.springMysqLelastic.mapper.UserMapper' 配置。

UserMapper.java 

package com.example.springMysqLelastic.mapper;

import com.example.springMysqLelastic.model.Food;
import com.example.springMysqLelastic.model.FoodModel;
import com.example.springMysqLelastic.model.User;
import com.example.springMysqLelastic.model.usermodel;
import com.example.springMysqLelastic.model.dto.FoodDTO;
import com.example.springMysqLelastic.model.dto.UserDTO;
import org.mapstruct.Mapper;
import org.springframework.stereotype.Component;

import java.util.List;
//@Component
@Mapper(componentModel = "spring")
public interface UserMapper {

    UserDTO toUserDTO(User user);

    List<UserDTO> toUserDtos(List<User> users);

    User toUser(UserDTO userDTO);

    List<User> toUsers(List<UserDTO> userDTOS);

    usermodel tousermodel(User user);
/*
    FoodDTO toFoodDTO(Food food);

    List<FoodDTO> toFoodDtos(List<Food> foods);

    Food toFood(FoodDTO foodDTO);

    List<Food> toFoods(List<FoodDTO> foodDTOS);

    FoodModel toFoodModel(Food food);*/
}

UserService 

package com.example.springMysqLelastic.service.impl;

import com.example.springMysqLelastic.mapper.UserMapper;
import com.example.springMysqLelastic.model.User;
import com.example.springMysqLelastic.model.dto.UserDTO;
import com.example.springMysqLelastic.repo.IUserDAO;
import com.example.springMysqLelastic.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService implements IUserService {

    private IUserDAO userDAO;
    private UserMapper userMapper;

    @Autowired
    public UserService(IUserDAO userDAO,UserMapper userMapper) {
        this.userDAO = userDAO;
        this.userMapper = userMapper;
    }
    
    @Override
    public UserDTO save(UserDTO userDTO) {
        User user = this.userDAO.save(this.userMapper.toUser(userDTO));
        return this.userMapper.toUserDTO(user);
    }

    @Override
    public UserDTO findById(Long id) {
        return this.userMapper.toUserDTO(this.userDAO.findById(id).orElse(null));
    }

    @Override
    public List<UserDTO> findAll() {
        return this.userMapper.toUserDtos(this.userDAO.findAll());
    }
}

UserController.java 

package com.example.springMysqLelastic.rest;

import com.example.springMysqLelastic.model.dto.UserDTO;
import com.example.springMysqLelastic.service.IUserService;
import com.example.springMysqLelastic.utils.PathResources;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user") //PathResources.USER
public class UserController {

    private final IUserService userService;

    @Autowired
    public UserController(IUserService userService) {
        this.userService = userService;
    }

    @PostMapping("/save") //PathResources.SAVE
    public ResponseEntity<UserDTO> saveUser(@RequestBody UserDTO userDTO) {
        return new ResponseEntity<>(this.userService.save(userDTO),HttpStatus.OK);
    }

    @GetMapping("/find-one/{id}") //PathResources.FIND_ONE + "/{" + PathResources.ID + "}"
    public ResponseEntity<UserDTO> findById(@PathVariable Long id) {
        return new ResponseEntity<>(this.userService.findById(id),HttpStatus.OK);
    }

    @GetMapping("/find-all") //PathResources.FIND_ALL
    public ResponseEntity<List<UserDTO>> findById() {
        return new ResponseEntity<>(this.userService.findAll(),HttpStatus.OK);
    }
}

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>2.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>spring-MysqL-elastic</artifactId>
    <packaging>jar</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-MysqL-elastic</name>
    <description>Demo project for MysqL and ElasticSearch Synchronization in Spring</description>

    <properties>
        <java.version>1.8</java.version>
        <mapstruct.version>1.4.0.Beta3</mapstruct.version>
        <org.json.version>20190722</org.json.version>
        <swagger.version>2.9.2</swagger.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>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
                <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>MysqL</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-jdk8</artifactId>
            <version>${mapstruct.version}</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.json/json -->
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>${org.json.version}</version>
        </dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson 
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.73</version>
</dependency>-->

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <!--<version>1.18.12</version>-->
            <type>jar</type>
        </dependency>
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.6</version>
</dependency>
        <dependency>
            <groupId>jakarta.validation</groupId>
            <artifactId>jakarta.validation-api</artifactId>
            <version>2.0.2</version>
            <type>jar</type>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                        <configuration>
                            <mainClass>com.example.springMysqLelastic.SpringMysqLElasticApplication</mainClass>
                        </configuration>
                    </execution>
                </executions>
            </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.mapstruct</groupId>
                            <artifactId>mapstruct-processor</artifactId>
                            <version>${mapstruct.version}</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

主班 

package com.example.springMysqLelastic;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
//@SpringBootApplication(scanBasePackages={"com.example.springMysqLelastic"})
@EnableElasticsearchRepositories("com.example.springMysqLelastic.repo.elastic")
@EnableScheduling
//@ComponentScan(scanBasePackages = {"com.example.springMysqLelastic"})
//@EntityScan("com.example.springMysqLelastic.model")
//@EnableJpaRepositories("com.example.springMysqLelastic")
//@ComponentScan(basePackages = {"com.example.springMysqLelastic"})
//@EnableAutoConfiguration

public class SpringMysqLElasticApplication {

    public static void main(String[] args) {

        SpringApplication.run(SpringMysqLElasticApplication.class,args);
    }

}

解决方法

我认为这是与mapstruct库冲突的问题。

我如下修改了您的POM，它开始为我工作。他们在这里有一些讨论此问题的文档。 https://www.programmersought.com/article/6208308983/ 

<?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>2.3.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example</groupId>
  <artifactId>spring-mysql-elastic</artifactId>
  <packaging>jar</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>spring-mysql-elastic</name>
  <description>Demo project for Mysql and ElasticSearch Synchronization in Spring</description>

  <properties>
    <java.version>1.8</java.version>
    <mapstruct.version>1.4.0.Beta3</mapstruct.version>
    <org.json.version>20190722</org.json.version>
    <swagger.version>2.9.2</swagger.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct-jdk8</artifactId>
      <version>${mapstruct.version}</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.json/json -->
    <dependency>
      <groupId>org.json</groupId>
      <artifactId>json</artifactId>
      <version>${org.json.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.73</version>
    </dependency>-->

    <dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger2</artifactId>
      <version>${swagger.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.mapstruct</groupId>
          <artifactId>mapstruct</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger-ui</artifactId>
      <version>${swagger.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.mapstruct</groupId>
          <artifactId>mapstruct</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <!--<version>1.18.12</version>-->
      <type>jar</type>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.8.6</version>
    </dependency>
    <dependency>
      <groupId>jakarta.validation</groupId>
      <artifactId>jakarta.validation-api</artifactId>
      <version>2.0.2</version>
      <type>jar</type>
    </dependency>
    <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct</artifactId>
      <version>1.4.0.Beta3</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
            <configuration>
              <mainClass>com.example.springmysqlelastic.SpringMysqlElasticApplication</mainClass>
            </configuration>
          </execution>
        </executions>
      </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.mapstruct</groupId>
                <artifactId>mapstruct-processor</artifactId>
                <version>1.4.0.Beta3</version>
            </path>
          </annotationProcessorPaths>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>

PS：我已经删除了JPA依赖关系，以使其在没有spring的情况下工作。算了。

您会发现我已将招摇依赖性更改为如下所示-

<dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger2</artifactId>
      <version>${swagger.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.mapstruct</groupId>
          <artifactId>mapstruct</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger-ui</artifactId>
      <version>${swagger.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.mapstruct</groupId>
          <artifactId>mapstruct</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

您可以检查它是否适合您吗？

更新 在代码生成步骤之后，这就是它生成的-

package com.example.springmysqlelastic.mapper;

import java.util.ArrayList;
import java.util.List;
import javax.annotation.Generated;
import org.springframework.stereotype.Component;

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",date = "2020-08-11T16:40:57+0530",comments = "version: 1.4.0.Beta3,compiler: javac,environment: Java 1.8.0_265 (Private Build)"
)
@Component
public class UserMapperImpl implements UserMapper {

    @Override
    public UserDTO toUserDTO(User user) {
        if ( user == null ) {
            return null;
        }

        UserDTO userDTO = new UserDTO();

        return userDTO;
    }

    @Override
    public List<UserDTO> toUserDtos(List<User> users) {
        if ( users == null ) {
            return null;
        }

        List<UserDTO> list = new ArrayList<UserDTO>( users.size() );
        for ( User user : users ) {
            list.add( toUserDTO( user ) );
        }

        return list;
    }

    @Override
    public User toUser(UserDTO userDTO) {
        if ( userDTO == null ) {
            return null;
        }

        User user = new User();

        return user;
    }

    @Override
    public List<User> toUsers(List<UserDTO> userDTOS) {
        if ( userDTOS == null ) {
            return null;
        }

        List<User> list = new ArrayList<User>( userDTOS.size() );
        for ( UserDTO userDTO : userDTOS ) {
            list.add( toUser( userDTO ) );
        }

        return list;
    }
}
,

在documentation中说除了main依赖之外，还需要添加annotationProcessor

Gradle 示例：

dependencies {
    implementation 'org.mapstruct:mapstruct:1.4.2.Final'
    annotationProcessor 'org.mapstruct:mapstruct-processor:1.4.2.Final'
}

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