[FIXED] Spring Boot cannot autowired component with abstract and interface

Issue

In my Spring Boot 2.0.2 application I am trying to inject a component herited from abstract class which implements an interface and it doesn't work.

Code :

Component Abstract : (Do I need to put @Component ?)

package app.project.service;

@Component
public abstract class AbstractStepService implements IStepService {

    protected final void addTask() {
        ...
    }

    @Override
    public StepDataDto launch() throws StepException {
        ...
    }
}

Interface :

package app.project.service;

public interface IStepService  {
    StepDataDto launch() throws StepException;
}

package app.project.service;

Component :

@Component
public class CStepServiceImpl extends AbstractStepService implements IStepService {

    @PostConstruct
    private void defineTasks() {
    }
}

package app.project.service;

Junit Test :

@RunWith(SpringRunner.class)
@SpringBootTest
public class CStepServiceTest {

    @Autowired
    @Qualifier("cStepServiceImpl")
    private IStepService service;

}

package app.project;

Application :

@SpringBootApplication
@ComponentScan(basePackages ={"app.project.service"})
public class MyApplication {}

Error message when launching my Junit test :

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'app.project.service.IStepService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=cStepServiceImpl)}

Any idea ?

Thanks

Solution

Change your declaration like this

@Autowired
@Qualifier("CStepServiceImpl")
private IStepService service;

or

@Autowired
private IStepService CStepServiceImpl;  

That should work. The bean name created automatically by spring has CStepServiceImpl name.

You can also name your bean like this

@Component(value = "myName")
public class CStepServiceImpl extends AbstractStepService implements IStepService {

}

and use myName during Autowiring.

Answered By - pvpkiran