Websphere에서 EntityManager에 액세스 할 때 NullPointerException이 발생했습니다.

다음 코드가 있습니다.Websphere에서 EntityManager에 액세스 할 때 NullPointerException이 발생했습니다.

public class PersistableProcessStepStatus extends ProcessStepStatus { 
    @PersistenceContext(unitName = "primary") 
    private EntityManager entityManager;  
    private void changeFlag(String namedQuery, String flag, boolean enable) { 
       getEntityManager().createNamedQuery(namedQuery) 
           .setParameter("a", prozessName) 
           .setParameter("b", vorgangName) 
           .setParameter(flag, enable).executeUpdate(); 
     } 
    [...] 
}

JMX 콘솔에서 내 메서드를 호출하고 예외가 throw되는 changeFlag 메서드로갑니다. 엔티티 관리자는 내 응용 프로그램의 다른 부분에서 작동합니다. 이 애플리케이션은 Websphere 8.5.5.1에서 실행됩니다.

JPATxEntityManager의 소스 코드를 찾을 수 없으므로 처리 방법을 모르겠습니다.

다음은 createNamedQuery 메서드를 호출하여 throw되는 예외입니다.

[30/10/14 15:18:34:805 CET] 000002a7 SystemErr  R java.lang.NullPointerException 
[30/10/14 15:18:34:805 CET] 000002a7 SystemErr  R at com.ibm.ws.jpa.management.JPATxEntityManager.getEMInvocationInfo(JPATxEntityManager.java:218) 
[30/10/14 15:18:34:805 CET] 000002a7 SystemErr  R at com.ibm.ws.jpa.management.JPATxEntityManager.getEMInvocationInfo(JPATxEntityManager.java:191) 
[30/10/14 15:18:34:806 CET] 000002a7 SystemErr  R at com.ibm.ws.jpa.management.JPAEntityManager.createNamedQuery(JPAEntityManager.java:312) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at public.PersistableProcessStepStatus.changeFlag(PersistableProcessStepStatus.java:34) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at public.PersistableProcessStepStatus.enableDebugMode(PersistableProcessStepStatus.java:51) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at java.lang.reflect.Method.invoke(Method.java:611) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:69) 
[30/10/14 15:18:38:694 CET] 000002a7 SystemErr  R at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at java.lang.reflect.Method.invoke(Method.java:611) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:272) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1152) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at java.security.AccessController.doPrivileged(AccessController.java:298) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at com.ibm.oti.security.CheckedAccessControlContext.securityCheck(CheckedAccessControlContext.java:30) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at sun.misc.JavaSecurityAccessWrapper.doIntersectionPrivilege(JavaSecurityAccessWrapper.java:41) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1146) 
[30/10/14 15:18:38:695 CET] 000002a7 SystemErr  R at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:999) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:847) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:783) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.ibm.ws.management.AdminServiceImpl$1.run(AdminServiceImpl.java:1335) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:1228) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at com.ibm.ws.management.remote.AdminServiceForwarder.invoke(AdminServiceForwarder.java:346) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:86) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399) 
[30/10/14 15:18:38:696 CET] 000002a7 SystemErr  R at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:830) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at javax.management.remote.rmi._RMIConnectionImpl_Tie.invoke(_RMIConnectionImpl_Tie.java:751) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at javax.management.remote.rmi._RMIConnectionImpl_Tie._invoke(_RMIConnectionImpl_Tie.java:158) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:631) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:501) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.rmi.iiop.ORB.process(ORB.java:622) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.CORBA.iiop.ORB.process(ORB.java:1581) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.rmi.iiop.Connection.doRequestWork(Connection.java:3148) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.rmi.iiop.Connection.doWork(Connection.java:3013) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:63) 
[30/10/14 15:18:38:697 CET] 000002a7 SystemErr  R at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118) 
[30/10/14 15:18:38:698 CET] 000002a7 SystemErr  R at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1864)

출처

2014-10-30 user831217

이인가

@TransactionManagement(TransactionManagementType.BEAN) public class PersistableProcessStepStatus extends ProcessStepStatus { @PersistenceUnit(unitName = "second") private EntityManagerFactory entityManagerFactory; private void changeFlag(String namedQuery, String flag, boolean enable) { entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); entityManager.createNamedQuery(namedQuery) .setParameter("a", prozessName) .setParameter("b", vorgangName) .setParameter(flag, enable).executeUpdate(); entityManager.getTransaction().commit();

} :

것은이 persistence.xml에

<persistence-unit name="second" transaction-type="RESOURCE_LOCAL">

변화 클래스를 persistente-utnit를 만들 MBean? 이것은 추측이지만 JTA 트랜잭션과 관련이 없다고 말할 수 있습니다. 주석을 @PersistenceUnit으로 변경하고 트랜잭션을 수동으로 시작하십시오. – Gas

그래서이에 대한 해결책은 다음과 같습니다

출처

2014-11-03 09:07:36 user831217

Websphere에서 EntityManager에 액세스 할 때 NullPointerException이 발생했습니다.

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