Jakarta ee 只有在Netbeans 7.1和GlassFish Server 3.1上编译代码后,EntityManager才会出现异常
我正在使用Netbeans 7.1和GlassFish server 3.1部署我的第一个JavaEE项目。 在我对ejb代码进行任何更改/编译之后,我遇到了一个从项目开始就困扰着我的问题,代码只是抛出了下面的异常(主要的异常也是最奇怪的-java.lang.ClassCastException:com.bestdeal.entity.Games不能转换为com.bestdeal.entity.Games)。 当我重新启动glassfish服务器时,这个问题似乎总是可以解决的,但是如果我对代码进行任何更改,同样的问题会再次出现 我正在使用JPA、EntityManager和EntityManager工厂在需要时构建EntityManager。对DB的访问发生在我通过faces页面发出请求之后,该页面随后调用托管Bean中的一个函数,该函数反过来触发对EBJ代码中dataaccess类的请求(如下所示) 你知道是什么导致了这个恼人的问题吗Jakarta ee 只有在Netbeans 7.1和GlassFish Server 3.1上编译代码后,EntityManager才会出现异常,jakarta-ee,persistence,glassfish-3,netbeans-7,Jakarta Ee,Persistence,Glassfish 3,Netbeans 7,我正在使用Netbeans 7.1和GlassFish server 3.1部署我的第一个JavaEE项目。 在我对ejb代码进行任何更改/编译之后,我遇到了一个从项目开始就困扰着我的问题,代码只是抛出了下面的异常(主要的异常也是最奇怪的-java.lang.ClassCastException:com.bestdeal.entity.Games不能转换为com.bestdeal.entity.Games)。 当我重新启动glassfish服务器时,这个问题似乎总是可以解决的,但是如果我对代码进
javax.ejb.EJBException
javax.faces.el.EvaluationException: javax.ejb.EJBException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.ejb.EJBException
at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5193)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5091)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4879)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at $Proxy219.prepareSession(Unknown Source)
at com.bestdeal.ejb.__EJB31_Generated__BestDeal__Intf____Bean__.prepareSession(Unknown Source)
at com.bestdeal.web.BestDealMBean.prepareSession(BestDealMBean.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:737)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:254)
at com.sun.el.parser.AstValue.invoke(AstValue.java:228)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 33 more
Caused by: java.lang.ClassCastException: com.bestdeal.entity.Games cannot be cast to com.bestdeal.entity.Games
at com.bestdeal.ejb.DataAccess.GetSessionInit(DataAccess.java:263)
at com.bestdeal.ejb.EventProcessor.StartEventProcessor(EventProcessor.java:65)
at com.bestdeal.ejb.BestDeal.prepareSession(BestDeal.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5366)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5338)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5326)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
... 47 more
EJB代码:
public class DataAccess {
private final EntityManagerFactory emf;
private EntityManager em;
public DataAccess() {
emf = Persistence.createEntityManagerFactory("Best-ejbPU");
em = emf.createEntityManager();
}
public Games GetSessionInit(int SessionId){
em.clear();
Query query = em.createNativeQuery("update games set PeopleInStore=MarketShare*MarketTotal where gameindex=1;");
query.executeUpdate();
Query querysql = em.createQuery("select g from Games g where g.sessionNumber=" + SessionId);
List<Games> l = querysql.getResultList();
return l.get(0);//=>javax.ejb.EJBException occurs here !!!!!!!!!!!!!!!!!!
}
}
公共类数据访问{
私人最终实体管理工厂emf;
私人实体管理者;
公共数据访问(){
emf=Persistence.createEntityManagerFactory(“最佳ejbPU”);
em=emf.createEntityManager();
}
公共游戏GetSessionInit(int SessionId){
em.clear();
Query Query=em.createNativeQuery(“更新游戏集PeopleInStore=MarketShare*MarketTotal,其中gameindex=1;”;
query.executeUpdate();
queryquerysql=em.createQuery(“从游戏g中选择g,其中g.sessionNumber=“+SessionId”);
List l=querysql.getResultList();
返回l.get(0);//=>javax.ejb.EJBException发生在此处!!!!!!!!!!!!!!!!!!
}
}
这有点取决于您如何设置持久化单元,但我并不感到惊讶,因为这不起作用
用于获取实体管理器的方法是JavaSE
方法。JavaEE不一定支持这一点。我确信JBoss上运行的代码也不一样
除非您跳过了注释,否则您显示的bean也不是EJB(因此,您显示的不是EJB代码)
在JavaEE中,您应该注入实体管理器,或者从JNDI中查找它。然后,您的bean将如下所示:
@Stateless
public class DataAccess {
@PersistenceContext
private EntityManager em;
public Games getSessionInit(int SessionId) {
em.createNativeQuery("update games set PeopleInStore = MarketShare * MarketTotal where gameindex = 1;")
.executeUpdate();
return em.createQuery("select g from Games g where g.sessionNumber=" + SessionId)
.getResultList()
.get(0);
}
}
(与问题无关,但您可能需要重构代码,而不是盲目地使用第一个元素;列表可能是空的。另外考虑使用命名查询机制将查询放入单独的文件中,参见例如)
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