Autowiring with annotations exception

[msantos]

Hello there!! I'm new with spring and i am experiencing a problem wiring components. I have wired a Controller class to a Service class. But i'm having problems wiring the service class to a DAO class. i get this exception:

org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'publicadorService': Injection of autowired dependencies failed; 
nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private pt.msoftware.territorios.persistence.dao.PublicadorDao pt.msoftware.territorios.persistence.services.PublicadorService.publicadorDao; 
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No matching bean of type [pt.msoftware.territorios.persistence.dao.PublicadorDao] found for dependency: 
expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.inject.Inject()}

Here is the code of the classes:

@Controller
@RequestMapping("/publicadores")
public class PublicadorController {
	@Inject
	private PublicadorService publicadorService;
	
	public PublicadorController() {
	}
	
	@RequestMapping("managePublicador")
	public String managePublicador(Model model) {
		model.addAttribute("publicador", new Publicador());
		return "/publicadores/managePub";
	}
	
	@RequestMapping(value="savePub", method=RequestMethod.POST)
	public String savePublicador(Publicador publicador, BindingResult bindingResult) {
		publicadorService.savePublicador(publicador);
		return "";
	}
}

@Service
public class PublicadorService {
	@Inject
	private PublicadorDao publicadorDao;
	
	public PublicadorService() {
		
	}
	
	public PublicadorService(PublicadorDao publicadorDao) {
		this.publicadorDao = publicadorDao;
	}
	
	public void savePublicador(Publicador publicador) {
		publicadorDao.merge(publicador);
	}
	
	public Publicador getPublicador(Publicador publicador) {
		return  publicadorDao.find(publicador.getId());
	}
}

I got the exception after adding the @Inject annotation above publicadorDao.

@Repository("pulbicadorDao")
@Transactional
public class PublicadorDao implements BaseDao {
	@PersistenceContext
	private EntityManager em;
	
	public void persist(BaseEntity baseEntity) {
		em.persist(baseEntity);
	}

	public void merge(BaseEntity baseEntity) {
		em.merge(baseEntity);
	}

	public void delete(BaseEntity baseEntity) {
		em.remove(baseEntity);
	}

	public Publicador find(Integer id) {
		return em.find(Publicador.class, id);
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:beans="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<context:annotation-config />

	<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

	<!-- Enables the Spring MVC @Controller programming model -->
	<annotation-driven />

	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
	<resources mapping="/resources/**" location="/resources/" />

	<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
	<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<beans:property name="prefix" value="/WEB-INF/views/" />
		<beans:property name="suffix" value=".jsp" />
	</beans:bean>
	
	<context:component-scan base-package="pt.msoftware.territorios" />
	
	<!--  JPA AND HIBERNATE -->	
	
	<beans:bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<beans:property name="dataSource" ref="dataSource" />
		<beans:property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
		<beans:property name="persistenceUnitName" value="territoriosPU"/>
	</beans:bean>
	
	<beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<beans:property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <beans:property name="url" value="jdbc:mysql://localhost:3306/territorios"/>
        <beans:property name="username" value="territuser"/>
        <beans:property name="password" value="territuser"/>
	</beans:bean>
	
	<beans:bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
		<beans:property name="database" value="MYSQL" />
		<beans:property name="showSql" value="true" />
		<beans:property name="generateDdl" value="true" />
		<beans:property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />	
	</beans:bean>
	
	<beans:bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
	
	<!-- Exception translation bean post processor -->
  	<beans:bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
</beans:beans>

Can anyone figure it out what am i doing wrong? Thanks a lot.

[msantos]

Hello there.

I already fixed the problem, but i did not understand what i have done.

On the service class, instead of used the PublicadorDao class on the @Inject annotation i have used the interface like this:

@Inject
private IPublicadorDao  publicadorDao;

Why using the interface instead the concrete class annotated with the @Repository it works?

[dkarr]

I don't know, but I would point out the following:
* PublicadorDao implements BaseDao, not IPublicadorDao. You don't show that definition or reference anywhere.
* Probably irrelevant, but perhaps '@Repository("pulbicadorDao")' should be '@Repository("publicadorDao")'.

[msantos]

You are right on both cases.

1) I have noticed too that the name of the repository was wrong. But using the wright name or even removing it the problem remains.

2) I have mistaken on the interface. Meanwhile I changed the interface to IPublicadorDao wich extends from the interface BaseDao. AND IT IS WORKING. But i don't know why.

Would Spring thinks that BaseDao is a Repository too? But it isn't annotated!!! Im not understanding the root of the problem.