MapStruct - @Mapper annotation don't create bean

Question

I downloaded application from this source https://github.com/springframeworkguru/spring5-mvc-rest/tree/vendor-api And I have a problem with MapStruct.

@Mapper
public interface CategoryMapper {

CategoryMapper INSTANCE = Mappers.getMapper(CategoryMapper.class);


CategoryDTO categoryToCategoryDTO(Category category);

}

@Data
public class CategoryDTO {
    private Long id;
    private String name;
}

domain class:

@Data
@Entity
public class Category {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
}

Service class:

@Service
public class CategoryServiceImpl implements CategoryService {

    private final CategoryMapper categoryMapper;
    private final CategoryRepository categoryRepository;

    public CategoryServiceImpl(CategoryMapper categoryMapper, CategoryRepository categoryRepository) {
        this.categoryMapper = categoryMapper;
        this.categoryRepository = categoryRepository;
    }
}

And in pom.xml dependency, I paste only two::

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <org.mapstruct.version>1.2.0.CR2</org.mapstruct.version>
</properties>
<dependency>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct-jdk8</artifactId>
        <version>${org.mapstruct.version}</version>
</dependency>

And plugin:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.7.0</version>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <annotationProcessorPaths>
            <path>
                 <groupId>org.projectlombok</groupId>
                 <artifactId>lombok</artifactId>
                 <version>${lombok.version}</version>
            </path>
            <path>
                 <groupId>org.mapstruct</groupId>
                 <artifactId>mapstruct-processor</artifactId>
                 <version>${org.mapstruct.version}</version>
           </path>
        </annotationProcessorPaths>
        <compilerArgs>
           <compilerArg>
                 -Amapstruct.defaultComponentModel=spring
           </compilerArg>
        </compilerArgs>
    </configuration>
</plugin>

Description:

Parameter 0 of constructor in 
guru.springfamework.services.CategoryServiceImpl required a bean of type 'guru.springfamework.api.v1.mapper.CategoryMapper' that could not be found.

Action:

Consider defining a bean of type 'guru.springfamework.api.v1.mapper.CategoryMapper' in your configuration.

I think that in my Intellij annotation @Mapper don't create a bean for mapper. I didn't change code from John GitHub. Any idea? I tried to change path generated source to target but this doesn't help Thanks for help.

Answer 1

In your Mapper class, use @Mapper(componentModel = "spring") instead of just @Mapper

and run mvn clean install, that's it! you're done!

and the alternative to it, is to define compiler arguments in plugin of pom.xml like below!

 <plugin>
     <configuration>
         <compilerArgs>
             <compilerArg>
                 -Amapstruct.defaultComponentModel=spring
             </compilerArg>
         </compilerArgs>
     </configuration>
 </plugin>