Java – EJB 3.1 Dependency Injection Failed

code-injectiondependenciesejbjava

i have created a stateless session bean like this : 

@WebServlet(name = "ProductController", urlPatterns = {"/ProductController"})
public class ProductController extends HttpServlet {

  @EJB
  private ProductFacadeBean productBean;
}

@Stateless
public class ProductFacadeBean extends AbstractFacade<Product> implements ProductFacadeLocalInterface {
  @PersistenceContext(unitName = "OnlineStorePU")
  private EntityManager em;

  protected EntityManager getEntityManager() {
    return em;
  }

  public ProductFacadeBean() {
    super(Product.class);
  }

}

@Local
public interface ProductFacadeLocalInterface {

  void create(Product product);

  void edit(Product product);

  void remove(Product product);

  Product find(Object id);

  List<Product> findAll();

  List<Product> findRange(int[] range);

  int count();

}


public abstract class AbstractFacade<T> {
  private Class<T> entityClass;

  public AbstractFacade(Class<T> entityClass) {
    this.entityClass = entityClass;
  }

  protected abstract EntityManager getEntityManager();

  public void create(T entity) {
    getEntityManager().persist(entity);
  }

  public void edit(T entity) {
    getEntityManager().merge(entity);
  }

  public void remove(T entity) {
    getEntityManager().remove(getEntityManager().merge(entity));
  }

  public T find(Object id) {
    return getEntityManager().find(entityClass, id);
  }

  public List<T> findAll() {
    javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
    cq.select(cq.from(entityClass));
    return getEntityManager().createQuery(cq).getResultList();
  }

  public List<T> findRange(int[] range) {
    javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
    cq.select(cq.from(entityClass));
    javax.persistence.Query q = getEntityManager().createQuery(cq);
    q.setMaxResults(range[1] - range[0]);
    q.setFirstResult(range[0]);
    return q.getResultList();
  }

  public int count() {
    javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
    javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
    cq.select(getEntityManager().getCriteriaBuilder().count(rt));
    javax.persistence.Query q = getEntityManager().createQuery(cq);
    return ((Long) q.getSingleResult()).intValue();
  }

}

Question :

  1. What is the error about ? How to
    solve it ?

    javax.naming.NamingException: Lookup
    failed for
    'java:comp/env/Controller.ProductController/productBean'
    in
    SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory,
    java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl,
    java.naming.factory.url.pkgs=com.sun.enterprise.naming}
    [Root exception is
    javax.naming.NamingException:
    Exception resolving Ejb for 'Remote
    ejb-ref
    name=Controller.ProductController/productBean,Remote
    3.x interface =EJB.ProductFacadeBean,ejb-link=null,lookup=,mappedName=,jndi-name=EJB.ProductFacadeBean,refType=Session'
    . Actual (possibly internal) Remote
    JNDI name used for lookup is
    'EJB.ProductFacadeBean#EJB.ProductFacadeBean'
    [Root exception is
    javax.naming.NamingException: Lookup
    failed for
    'EJB.ProductFacadeBean#EJB.ProductFacadeBean'
    in
    SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory,
    java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl,
    java.naming.factory.url.pkgs=com.sun.enterprise.naming}
    [Root exception is
    javax.naming.NameNotFoundException:
    EJB.ProductFacadeBean#EJB.ProductFacadeBean
    not found]]]

The full exception is attached here : 

HTTP Status 500 -

type Exception report

message

descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: PWC1392: Error instantiating servlet class Controller.ProductController

root cause

com.sun.enterprise.container.common.spi.util.InjectionException: Error creating managed object for class Controller.ProductController

root cause

com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=Controller.ProductController/productBean,Remote
3.x interface =EJB.ProductFacadeBean,ejb-link=null,lookup=,mappedName=,jndi-name=EJB.ProductFacadeBean,refType=Session into class Controller.ProductController

root cause

javax.naming.NamingException: Lookup failed for 'java:comp/env/Controller.ProductController/productBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=Controller.ProductController/productBean,Remote
3.x interface =EJB.ProductFacadeBean,ejb-link=null,lookup=,mappedName=,jndi-name=EJB.ProductFacadeBean,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'EJB.ProductFacadeBean#EJB.ProductFacadeBean' [Root exception is javax.naming.NamingException: Lookup failed for 'EJB.ProductFacadeBean#EJB.ProductFacadeBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: EJB.ProductFacadeBean#EJB.ProductFacadeBean not found]]]

root cause

javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=Controller.ProductController/productBean,Remote
3.x interface =EJB.ProductFacadeBean,ejb-link=null,lookup=,mappedName=,jndi-name=EJB.ProductFacadeBean,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'EJB.ProductFacadeBean#EJB.ProductFacadeBean' [Root exception is javax.naming.NamingException: Lookup failed for 'EJB.ProductFacadeBean#EJB.ProductFacadeBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: EJB.ProductFacadeBean#EJB.ProductFacadeBean not found]]

root cause

javax.naming.NamingException: Lookup failed for 'EJB.ProductFacadeBean#EJB.ProductFacadeBean' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: EJB.ProductFacadeBean#EJB.ProductFacadeBean not found]

root cause

javax.naming.NameNotFoundException: EJB.ProductFacadeBean#EJB.ProductFacadeBean not found

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.1 logs. GlassFish Server Open Source Edition 3.1
  1. When i created the session for
    entity bean using netbeans it
    created the abstract facade for us ?
    What is the purpose ? I know facade
    pattern is to serve as interface to
    route the request ?
  2. What is the use of ejb-jar.xml ?

All settings are default.
The ejb bean is created inside java ee 6 web application rather than in another war or jar.
Glassfish 3.1 server.

Please help.

Thanks.

Best Answer

You need to inject the bean by refering to its interface and not to its implementation directly. Something like this ..

@EJB
private ProductFacadeLocalInterface productBean;

You can then access the bean using the interface methods that you exposed in ProductFacadeLocalInterface.

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