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

I resolved the error by doing

1. mvn clean install

2. Also add this to your pom

      <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>