1 Reply Latest reply on Jan 25, 2007 3:49 PM by Lydia Chung

    GetEJBObject NullPointerException

    Lydia Chung Newbie

      I have problem when I try to get the object back from EJB Handle.

      I got the following exception:

      13:42:40,959 ERROR [STDERR] java.lang.NullPointerException
      13:42:40,959 ERROR [STDERR] at javax.naming.InitialContext.getURLScheme(Unknown Source)
      13:42:40,959 ERROR [STDERR] at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
      13:42:40,959 ERROR [STDERR] at javax.naming.InitialContext.lookup(Unknown Source)
      13:42:40,959 ERROR [STDERR] at org.jboss.ejb3.stateful.StatefulHandleImpl.getEJBObject(StatefulHandleImpl.java:173)
      13:42:40,959 ERROR [STDERR] at com.xxx.ejb3.ServiceLocator.getBean(ServiceLocator.java:45)
      13:42:40,969 ERROR [STDERR] at com.xxx.ejb3.PresentationBean.process(PresentationBean.java:56)
      13:42:40,969 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      13:42:40,969 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
      13:42:40,969 ERROR [STDERR] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:181)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:79)
      13:42:40,969 ERROR [STDERR] at $Proxy229.process(Unknown Source)
      13:42:40,969 ERROR [STDERR] at com.xxx.servlets.Gateway.doPost(Gateway.java:139)
      13:42:40,969 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      13:42:40,969 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      13:42:40,969 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
      13:42:40,969 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
      13:42:40,969 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
      13:42:40,969 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
      13:42:40,969 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
      13:42:40,969 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
      13:42:40,969 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
      13:42:40,969 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
      13:42:40,969 ERROR [STDERR] at java.lang.Thread.run(Unknown Source)
      13:42:40,969 ERROR [STDERR] java.rmi.RemoteException: Error during getEJBObject; nested exception is:
       java.lang.NullPointerException
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.stateful.StatefulHandleImpl.getEJBObject(StatefulHandleImpl.java:180)
      13:42:40,969 ERROR [STDERR] at com.xxx.ejb3.ServiceLocator.getBean(ServiceLocator.java:45)
      13:42:40,969 ERROR [STDERR] at com.xxx.ejb3.PresentationBean.process(PresentationBean.java:56)
      13:42:40,969 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      13:42:40,969 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
      13:42:40,969 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,969 ERROR [STDERR] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
      13:42:40,989 ERROR [STDERR] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
      13:42:40,989 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:181)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:79)
      13:42:40,989 ERROR [STDERR] at $Proxy229.process(Unknown Source)
      13:42:40,989 ERROR [STDERR] at com.xxx.servlets.Gateway.doPost(Gateway.java:139)
      13:42:40,989 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      13:42:40,989 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      13:42:40,989 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
      13:42:40,989 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
      13:42:40,989 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
      13:42:40,989 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
      13:42:40,989 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
      13:42:40,989 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
      13:42:40,989 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
      13:42:40,989 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
      13:42:40,989 ERROR [STDERR] at java.lang.Thread.run(Unknown Source)
      13:42:40,989 ERROR [STDERR] Caused by: java.lang.NullPointerException
      13:42:40,989 ERROR [STDERR] at javax.naming.InitialContext.getURLScheme(Unknown Source)
      13:42:40,989 ERROR [STDERR] at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
      13:42:40,989 ERROR [STDERR] at javax.naming.InitialContext.lookup(Unknown Source)
      13:42:40,989 ERROR [STDERR] at org.jboss.ejb3.stateful.StatefulHandleImpl.getEJBObject(StatefulHandleImpl.java:173)
      13:42:40,989 ERROR [STDERR] ... 51 more
      


      I have a ServiceLocator which get the Handle of NamePoolBean (stateful bean) and try to restore the NamePoolBean from the Handle.

      My programs are:
      @Stateful
      @Remote(NamePool.class)
      @RemoteHome(NamePoolHome.class)
      public class NamePoolBean{
      }
      
      public interface NamePool extends EJBObject{
       public Handle getHandle();
      }
      
      public interface NamePoolHome extends EJBHome{
       public NamePool create() throws CreateException, RemoteException;
      }
      
      public class ServiceLocator {
       public void getBean(){
       context = new InitialContext();
       namePoolHome = (NamePoolHome) context.lookup("PROJ/NamePoolBean/remoteHome");
       namePool = namePoolHome.create();
       handle = namePool.getHandle();
       EJBObject ejbObject = handle.getEJBObject();
      }
      


      Can anybody help?

      Thanks,