Styjun

When generating mapper-implementations with MapStruct, using "jsr330" componentModel, micronaut will throw a NoSuchBeanException during runtime when trying to inject those.

A workaround would be to use a provider that will supply the mapper-objects, but the generated code should work.

Mapper definition:

@Mapper(componentModel = "jsr330")
public interface FooBarMapper 
 Foo toFoo(Bar bar);

Controller:

@Controller
public class SomeController 
 @Inject
 public SomeController(FooBarMapper mapper) 
 

 @Get
 public String foo() 
 return "foo";
 

pom.xml excerpt:

<annotationProcessorPaths>
 <path>
 <groupId>org.mapstruct</groupId>
 <artifactId>mapstruct-processor</artifactId>
 <version>$mapstruct.version</version>
 </path>
 <path>
 <groupId>io.micronaut</groupId>
 <artifactId>micronaut-inject-java</artifactId>
 <version>$micronaut.version</version>
 </path>
 <path>
 <groupId>io.micronaut.configuration</groupId>
 <artifactId>micronaut-openapi</artifactId>
 <version>$micronaut.version</version>
 </path>
</annotationProcessorPaths>

When calling the method on the controller, I would expect Micronaut to find the Mapstruct generated class (it is annotated with @Singleton), but instead, the result is

Message: No bean of type [com.example.FooBarMapper] exists. Ensure the class is declared a bean and if you are using Java or Kotlin make sure you have enabled annotation processing.
Path Taken: new SomeController([FooBarMapper mapper])
io.micronaut.context.exceptions.DependencyInjectionException: Failed to inject value for parameter [mapper] of class: com.example.SomeController

I found Micronaut PR which should resolve the problem with mapstruct using jsr330 component model. They are planning to include the fix in 1.1.0.

UPDATE: The issue if fixed in 1.1.0.RC1