Question

我创建了一个像这样的无状态会话bean：

@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();
  }

}

问题：

有什么错误？如何解决它？

javax.naming.NamingException：查找失败了的Java：comp / env的/ Controller.ProductController /的ProductBean“ 在 SerialContext [myEnv = {java.naming.factory.initial的= 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} [根本例外是 javax.naming.NamingException中：异常解析'Remote'的Ejb EJB-REF 名称= Controller.ProductController /的ProductBean，远程 3.x interface = EJB.ProductFacadeBean，ejb-link = null，lookup =，mappedName =，jndi-name = EJB.ProductFacadeBean，refType = Session' 。实际（可能是内部）遥控器用于查找的JNDI名称是 'EJB.ProductFacadeBean＃EJB.ProductFacadeBean' [根本例外是 javax.naming.NamingException：查找失败了 'EJB.ProductFacadeBean＃EJB.ProductFacadeBean' 在 SerialContext [myEnv = {java.naming.factory.initial的= 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} [根本例外是 javax.naming.NameNotFoundException： EJB.ProductFacadeBean＃EJB.ProductFacadeBean 找不到]]]

此处附有完整的例外情况：

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

当我创建会话时实体bean使用netbeans吧为我们创造了抽象的外观？什么目的？我知道门面模式是作为接口请求路由？
ejb-jar.xml有什么用？

所有设置均为默认设置。 ejb bean是在java ee 6 web应用程序中创建的，而不是在另一个war或jar中创建的。 Glassfish 3.1服务器。

请帮忙。

感谢。

Answer 1

您需要通过引用其接口而不是直接实现来注入bean。像这样......

@EJB
private ProductFacadeLocalInterface productBean;

然后，您可以使用在ProductFacadeLocalInterface中公开的接口方法访问bean。

Answer 2

您必须使用该界面。如果您使用Seam Solder和CDI，则可以使用

指定确切的实施方式

@Inject
@Exact(ProductFacadeBean.class)

EJB 3.1依赖注入失败

2 个答案: