1依赖注入失败

1依赖注入失败

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EJB 3.1依赖注入失败

本文介绍了EJB 3.1依赖注入失败的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我创建了一个无状态会话bean，如下所示：

  @WebServlet（name =ProductController，urlPatterns = { / ProductController}）
 public class ProductController extends HttpServlet {
 
 @EJB 
 private ProductFacadeBean productBean; 
} 
 
 @Stateless 
 public class ProductFacadeBean extends AbstractFacade< Product>实现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（产品）; 
 
 void remove（产品产品）; 
 
产品查找（Object id）; 
 
列表<产品>的findAll（）; 
 
列表<产品> 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（）。 
 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（）; 
} 
 
}

问题：


  1. 有什么错误？如何
    解决它？

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 forentity bean using netbeans itcreated the abstract facade for us ?What is the purpose ? I know facadepattern is to serve as interface toroute 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.

解决方案

you must use the interface. If you use Seam Solder and CDI you can specify the exact implementation with 

@Inject
@Exact(ProductFacadeBean.class)

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09-06 02:19
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