Question

I have this code for my Spring-based web project:

Controller:

@Controller
@RequestMapping("mycontroller")
public class MyObjectController {

    @Autowired
    private MyService service;
// Code omitted
}

Service:

@Service
public class MyServiceImpl implements MyService {

    @Autowired
    @Qualifier("mydao")
    private MyDao mydao;

    @Autowired
    @Qualifier("mydao2")
    private MyDao2 mydao2;

// Code omitted
}

Context.xml (Spring):

<annotation-driven />
<context:annotation-config /> 

<context:component-scan base-package="com.mycompany" />

<beans:bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<beans:bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />    

<beans:bean id="myService" class="com.mycompany.serviceimpl.MyServiceImpl" /> 

However it throws this error:

NoSuchBeanDefinitionException: No unique bean of type [com.mycompany.service.MyService] is defined: expected single matching bean but found 2: [myService, myServiceImpl]

Answer 1

Your bean is defined twice, here (@Service annotation, results in registering myServiceImpl bean):

@Service
public class MyServiceImpl implements MyService {

and here (in Context.xml, bean with myService id):

<beans:bean id="myService" class="com.mycompany.serviceimpl.MyServiceImpl" /> 

Either remove the definition from XML or remove the annotation.