NullPointerException at sun.reflect.NativeMethodAccessorImpl
mhoennig Apr 11, 2007 5:35 PMDear JBoss experts,
I tried my own "hello world" with EJB3 on JBoss 4.0.5GA today. But when I invoke a method on my SLSB, I am getting this stack:
[java] log4j:WARN No appenders could be found for logger (org.jboss.security.SecurityAssociation).
[java] log4j:WARN Please initialize the log4j system properly.
[java] java.lang.NullPointerException
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[java] at java.lang.reflect.Method.invoke(Method.java:585)
[java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
[java] at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:263)
[java] at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
[java] at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
[java] at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
[java] at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
[java] at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
[java] at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:398)
[java] at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
[java] at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
[java] at org.jboss.remoting.Client.invoke(Client.java:525)
[java] at org.jboss.remoting.Client.invoke(Client.java:488)
[java] at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
[java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
[java] at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
[java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
[java] at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
[java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
[java] at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:77)
[java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
[java] at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
[java] at $Proxy0.ping(Unknown Source)
[java] at ....EJB3TestClient.main(EJB3TestClient.java:38)
Does the log4j warning has to do with it? Looking at the stack I doubt it.
My SLSB is pretty simple:
1. a remote interface:
package ...; @javax.ejb.Remote public interface EJB3StatelessTestSessionFacade { public String ping(); }
2. the bean:
package ...; @javax.ejb.Stateless public class EJB3StatelessTestSessionBean implements EJB3StatelessTestSessionFacade { public String ping() { return "pong "; } }
3. a client:
package ...; import java.util.Properties; import javax.ejb.EJB; import javax.naming.InitialContext; public class EJB3TestClient { @EJB public static EJB3StatelessTestSessionFacade aFacade; /** * @param args */ public static void main(String[] args) { try { Properties p = new Properties(); p.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory"); p.put("java.naming.factory.url.pkgs","=org.jboss.naming:org.jnp.interfaces"); p.put("java.naming.provider.url","localhost:1099"); p.put("jnp.socket.Factory","org.jnp.interfaces.TimedSocketFactory"); System.out.println( "getting initial context" ); InitialContext aIC = new InitialContext(p); if ( aFacade == null ) { System.out.println( "session bean lookup" ); aFacade = (EJB3StatelessTestSessionFacade) aIC.lookup( "java:ejb3test/EJB3StatelessTestSessionBean/remote" ); } System.out.println( "calling session bean" ); System.out.println( aFacade.ping() ); } catch ( Exception aExc ) { aExc.printStackTrace(System.err); } } }
Any idea what I am doing wrong?
Thanks!
... Michael