[英]MapStruct implementation is not working in Spring Boot Web Application
我是 Spring Boot 和MapStruct工具的新手。
早些时候,一个项目(由其他团队使用这些技术编写)没有启动。 然后,我在 Mapper 抽象类中做了一些更改,但现在映射器对象在应用程序启动时变为 null。
映射器抽象类:
@Mapper(componentModel = "spring")
public abstract class UserAndEmployeeMapper {
public UserAndEmployeeMapper INSTANCE = Mappers.getMapper( UserAndEmployeeMapper.class );
@Mapping(source = "username", target = "name")
@Mapping(source = "ssn", target = "ssn", defaultValue = "xxxxxx" )
@Mapping(target = "salary", constant = "34.67")
@Mapping(target = "dob", dateFormat = "dd/MM/yyyy", constant = "10/12/2002")
public abstract Employee mapToEmployee(User user);
public abstract List<Employee> mapToEmployee(List<User> users);
@Mapping(source = "name", target = "username")
public abstract User mapToUser(Employee employee);
public abstract List<User> mapToUser(List<Employee> employees);
}
LoginServiceImpl 类
@Service("loginService")
public class LoginServiceImpl implements LoginService{
private static final AtomicLong counter = new AtomicLong();
@Autowired
private EmployeeDao employeeDao;
private UserAndEmployeeMapper userAndEmployeeMapper;
...
}
pom.xml
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven.compiler.plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${mapstruct.jdk8.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</build>
在 LoginServiceImpl 中添加 @Autowired 后,应用程序未启动并显示以下错误日志
***************************
APPLICATION FAILED TO START
***************************
Description:
Field userAndEmployeeMapper in org.service.impl.LoginServiceImpl required a bean of type 'org.mapper.UserAndEmployeeMapper' that could not be found.
Action:
Consider defining a bean of type 'org.mapper.UserAndEmployeeMapper' in your configuration.
有什么建议么 ?
首先, public UserAndEmployeeMapper INSTANCE = Mappers.getMapper( UserAndEmployeeMapper.class );
只能与默认组件模型一起使用,否则可能会导致UserAndEmployeeMapper
未正确初始化。
LoginServiceImpl
中的UserAndEmployeeMapper
必须使用@Autowired
注解,否则 Spring 无法将其注入,这就是它为null
的原因。
我不知道你的包结构。 如果您的 Spring Boot 应用程序类在包org
中,那么它将获取UserAndEmployeeMapperImpl
。 否则,请确保 spring 配置选择UserAndEmployeeMapperImpl
。
如果上面的所有内容都正确设置并且您正在通过 IDE 启动应用程序,请确保target/generated-sources
或 Gradle 的替代项是您的源的一部分并被拾取。 查看IDE 支持以确保您已正确设置 IDE 的注释处理器发现。 例如,IntelliJ 不会使用您当前的设置调用 MapStruct 注释处理器,它不会从 maven 编译器中获取annotationProcessorPaths
。
将抽象类作为接口对我有用。
public interface UserAndEmployeeMapper {
我也遇到了这个问题,将mapper从抽象类更改为接口对我来说不起作用。
我结束了:
WebAppMapper.java
@Mapper(componentModel = "spring")
public interface WebAppMapper {
CatalogData createCatalogRequestToData(CreateCatalogRequest createCatalogRequest);
}
WebAppMapperImpl.java
@Component
public class WebAppMapperImpl implements WebAppMapper {
@Override
public CatalogData createCatalogRequestToData(CreateCatalogRequest createCatalogRequest) {
CatalogData catalogData = new CatalogData();
catalogData.setId(createCatalogRequest.getId());
catalogData.setName(createCatalogRequest.getName());
return catalogData;
}
}
CatalogController.java
@Autowired
WebAppMapper webAppMapper;
webAppMapper.createCatalogRequestToData(createCatalogRequest);
这对我有用。
springfox-swagger2 依赖项在排除它并在 pom.xml 中添加特定版本的 mapstruct 依赖项后加载旧版本的 mapstruct 它开始生成源
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.2.2</version>
<exclusions>
<exclusion>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
</exclusion>
</exclusions>
在地图结构依赖项下方添加
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-jdk8</artifactId>
<version>1.3.0.Beta1</version>
为了使所有映射器类都符合 Spring bean 的要求,请将以下 compilerArgs 添加到您的 maven-compiler-plugin。
<compilerArgs>
<arg>-Amapstruct.suppressGeneratorTimestamp=true</arg>
<arg>-Amapstruct.defaultComponentModel=spring</arg>
</compilerArgs>
如果使用 maven-processor-plugin 添加以下选项
<options>
<mapstruct.suppressGeneratorTimestamp>
true
</mapstruct.suppressGeneratorTimestamp>
<mapstruct.defaultComponentModel>
spring
</mapstruct.defaultComponentModel>
</options>
在 pom.xml 中试试这个:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>17</source>
<target>17</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>1.4.2.Final</version>
</path>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
</path>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok-mapstruct-binding</artifactId>
<version>0.2.0</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
并重新加载 Maven (ALT+F5)
就我而言,我认为错误是由于 build.gradle 不完整造成的。
前
dependencies {
compile group: 'org.mapstruct', name: 'mapstruct-processor', version: '1.2.0.Final'
}
后
apply plugin: 'net.ltgt.apt'
dependencies {
compile group: 'org.mapstruct', name: 'mapstruct-processor', version: '1.2.0.Final'
compile group: 'org.mapstruct', name: 'mapstruct-jdk8', version: '1.2.0.Final'
apt 'org.mapstruct:mapstruct-processor:1.2.0.Final'
}
buildscript {
repositories {
mavenCentral()
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath("net.ltgt.gradle:gradle-apt-plugin:0.9")
}
}
确保您已正确配置 build.gradle,如 文档中所述。
如果使用 Eclipse,您可能需要安装m2e-apt插件。
它将在 IDE 中为 MapStruct 启用注释处理器。
首先很简单,您需要创建如下界面,
@Mapper(componentModel = "spring")
public interface CompanyMapper {
@BeanMapping(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
void updateCustomerFromDto(CompanyDto dto, @MappingTarget CompanyBean entity);
}
现在,当您运行应用程序时,它将在 target/generated-source 文件夹中自行生成其实现文件
因此,每当您想使用 CompanyMapper 时,您只需要像我们使用@Mapper(componentModel = "spring")
那样自动装配它,这样 spring boot 就可以注入它。
您还需要通过 eclipse 中的以下步骤启用 Maven 注释处理:
Step1 :- 右键单击项目
Step2 :- 转到属性
Step3 : 从侧边栏展开 Maven
Step4 :- 选择注释处理
第 5 步:- 选中启用项目特定设置
Step6 :- 选择实验单选按钮
Step7 :- 申请并关闭
完成 ! 我希望它对某人有帮助。
确保将注释处理器路径放在依赖项中。
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>${java.version}</source> <!-- depending on your project -->
<target>${java.version}</target> <!-- depending on your project -->
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${org.mapstruct.version}</version>
</path>
<!-- other annotation processors -->
</annotationProcessorPaths>
</configuration>
</plugin>
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>2.7.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.customer-service</groupId>
<artifactId>customer-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>customer-service</name>
<description>Microservice Client-Facture avec Spring Boot</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>2021.0.3</spring-cloud.version>
<org.mapstruct.version>1.4.2.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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</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.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>${org.mapstruct.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-ui</artifactId>
<version>1.5.2</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</exclude>
</excludes>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>17</source> <!-- depending on your project -->
<target>17</target> <!-- depending on your project -->
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</path>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${org.mapstruct.version}</version>
</path>
<!-- other annotation processors -->
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
</project>
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