GetEJBObject NullPointerException
lydiachung Jan 25, 2007 2:07 PMI 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,