NPE in StateslessContainer at line 396

[nagin.kothari]

Jboss 6.0 uses jboss-ejb3-core-1.2.2.jar . I am getting null ponter exception at line 396 of StateslessContainer class of  jboss-ejb3-core-1.2.2.jar.

I am not able to understand why I am getting this error, while same application is running fine in jboss 4.3.2. Can somebody help to sort out the issue?

[jaikiran]

Please post the entire exception stacktrace and also the exact version of JBoss AS 6.0. Have you done any changes to the clean JBoss AS download?

[nagin.kothari]

I am using Jboss 6.0.0M2

Following is complete stacktrace

java.lang.NullPointerException

at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(

StatelessContainer.java:396)

at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(

InvokableContextClassProxyHack.java:53)

at org.jboss.aop.Dispatcher.invoke(

Dispatcher.java:91)

at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(

AOPRemotingInvocationHandler.java:82)

at org.jboss.remoting.ServerInvoker.invoke(

ServerInvoker.java:897)

at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(

ServerThread.java:768)

at org.jboss.remoting.transport.socket.ServerThread.processInvocation(

ServerThread.java:721)

at org.jboss.remoting.transport.socket.ServerThread.dorun(

ServerThread.java:548)

at org.jboss.remoting.transport.socket.ServerThread.run(

ServerThread.java:234)

at org.jboss.remoting.MicroRemoteClientInvoker.invoke(

MicroRemoteClientInvoker.java:163)

at org.jboss.remoting.Client.invoke(

Client.java:1634)

at org.jboss.remoting.Client.invoke(

Client.java:548)

at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(

InvokeRemoteInterceptor.java:62)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(

ClientTxPropagationInterceptor.java:67)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(

SecurityClientInterceptor.java:65)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(

IsLocalInterceptor.java:74)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.aspects.remoting.PojiProxy.invoke(

PojiProxy.java:61)

at $Proxy44.invoke(Unknown Source)

at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(

SessionProxyInvocationHandlerBase.java:188)

at $Proxy43.authenticateUser(Unknown Source)

at com.acknow.servlets.login.GreetingServiceImpl.greetServer(

GreetingServiceImpl.java:45)

at sun.reflect.NativeMethodAccessorImpl.invoke0(

Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(

RPC.java:562)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(

RemoteServiceServlet.java:188)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(

RemoteServiceServlet.java:224)

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(

AbstractRemoteServiceServlet.java:62)

at javax.servlet.http.HttpServlet.service(

HttpServlet.java:637)

at javax.servlet.http.HttpServlet.service(

HttpServlet.java:717)

at org.mortbay.jetty.servlet.ServletHolder.handle(

ServletHolder.java:487)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(

ServletHandler.java:1097)

at com.acknow.webcore.WebAccessFilter.doFilter(

WebAccessFilter.java:39)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(

ServletHandler.java:1088)

at org.mortbay.jetty.servlet.ServletHandler.handle(

ServletHandler.java:360)

at org.mortbay.jetty.security.SecurityHandler.handle(

SecurityHandler.java:216)

at org.mortbay.jetty.servlet.SessionHandler.handle(

SessionHandler.java:181)

at org.mortbay.jetty.handler.ContextHandler.handle(

ContextHandler.java:729)

at org.mortbay.jetty.webapp.WebAppContext.handle(

WebAppContext.java:405)

at org.mortbay.jetty.handler.HandlerWrapper.handle(

HandlerWrapper.java:152)

at org.mortbay.jetty.handler.RequestLogHandler.handle(

RequestLogHandler.java:49)

at org.mortbay.jetty.handler.HandlerWrapper.handle(

HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(

Server.java:324)

at org.mortbay.jetty.HttpConnection.handleRequest(

HttpConnection.java:505)

at org.mortbay.jetty.HttpConnection$RequestHandler.content(

HttpConnection.java:843)

at org.mortbay.jetty.HttpParser.parseNext(

HttpParser.java:647)

at org.mortbay.jetty.HttpParser.parseAvailable(

HttpParser.java:211)

at org.mortbay.jetty.HttpConnection.handle(

HttpConnection.java:380)

at org.mortbay.io.nio.SelectChannelEndPoint.run(

SelectChannelEndPoint.java:395)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(

QueuedThreadPool.java:488)

at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(

InvokeRemoteInterceptor.java:74)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(

ClientTxPropagationInterceptor.java:67)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(

SecurityClientInterceptor.java:65)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(

IsLocalInterceptor.java:74)

at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(

MethodInvocation.java:101)

at org.jboss.aspects.remoting.PojiProxy.invoke(

PojiProxy.java:61)

at $Proxy44.invoke(Unknown Source)

at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(

SessionProxyInvocationHandlerBase.java:188)

at $Proxy43.authenticateUser(Unknown Source)

at com.acknow.servlets.login.GreetingServiceImpl.greetServer(

GreetingServiceImpl.java:45)

at sun.reflect.NativeMethodAccessorImpl.invoke0(

Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(

RPC.java:562)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(

RemoteServiceServlet.java:188)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(

RemoteServiceServlet.java:224)

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(

AbstractRemoteServiceServlet.java:62)

at javax.servlet.http.HttpServlet.service(

HttpServlet.java:637)

at javax.servlet.http.HttpServlet.service(

HttpServlet.java:717)

at org.mortbay.jetty.servlet.ServletHolder.handle(

ServletHolder.java:487)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(

ServletHandler.java:1097)

at com.acknow.webcore.WebAccessFilter.doFilter(

WebAccessFilter.java:39)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(

ServletHandler.java:1088)

at org.mortbay.jetty.servlet.ServletHandler.handle(

ServletHandler.java:360)

at org.mortbay.jetty.security.SecurityHandler.handle(

SecurityHandler.java:216)

at org.mortbay.jetty.servlet.SessionHandler.handle(

SessionHandler.java:181)

at org.mortbay.jetty.handler.ContextHandler.handle(

ContextHandler.java:729)

at org.mortbay.jetty.webapp.WebAppContext.handle(

WebAppContext.java:405)

at org.mortbay.jetty.handler.HandlerWrapper.handle(

HandlerWrapper.java:152)

at org.mortbay.jetty.handler.RequestLogHandler.handle(

RequestLogHandler.java:49)

at org.mortbay.jetty.handler.HandlerWrapper.handle(

HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(

Server.java:324)

at org.mortbay.jetty.HttpConnection.handleRequest(

HttpConnection.java:505)

at org.mortbay.jetty.HttpConnection$RequestHandler.content(

HttpConnection.java:843)

at org.mortbay.jetty.HttpParser.parseNext(

HttpParser.java:647)

at org.mortbay.jetty.HttpParser.parseAvailable(

HttpParser.java:211)

at org.mortbay.jetty.HttpConnection.handle(

HttpConnection.java:380)

at org.mortbay.io.nio.SelectChannelEndPoint.run(

SelectChannelEndPoint.java:395)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(

QueuedThreadPool.java:488)

[jaikiran]

The NPE is a known bug https://jira.jboss.org/jira/browse/EJBTHREE-1994

But the root cause is something specific to your application. Which bean method are you calling from the "authenticateUser" method? Can you post the relevant piece of code from the bean and its interfaces?

[nagin.kothari]

authentiacteUser is mtheod of Statless Session bean  UserService.

here is excerpt from my code

@Remote

public

interface UserService

{

User authenticateUser ()

throws ApplicationException;

}

@Stateless

public

class UserServiceBean implements UserService {

public

User authenticateUser() throws ApplicationException {

     System.

out.println(" in UserServiceBean: authenticateUser");

}

I am calling this method from servlet client as follows :

UserService service = (UserService) BeanLocator.getBean(

"UserServiceBean/remote");

User u = service.authenticateUser();

getBean  method in Beanlocater class looks into JNDI and provides the proxy for stateless bean UserServiceBean.

This code works fine in jboss 4.3.2, but not in jbosss 6.0M2

looking into source code of StatlessContainer at line 396

MethodInfo info = advisor.getMethodInfo(methodHash);
         Method unadvisedMethod = info.getMethod();

looks loke info is null, but why? I am not able to understand.

The mehod authenticateUser is present in UserServiceBean

[jaikiran]

Are you sure, the bean deployed on the server has that method? Also, does your client application (which calls this bean) have the correct (version of) jar files with the bean interface?

[jaikiran]

Also, please provide more details about your client application? Is it a standalone application? Is it a client application deployed on some other server instance? Or is it running on the same server? A complete exception stacktrace is also useful (Please do not use font colours while posting. Instead use the formatting options available in the forum editor).

[nagin.kothari]

The authenticateUser bean method is indeed available in Stateless bean UserServiceBaen. (same code is working fine in jboss 4.3.2).This method is been called from Servlet which is running another Servletcontainer(and not the jboss's tomcat).The earlier exception stack trace provided by me is complete one that I get on client.

[nagin.kothari]

Problem got resolved as there were some client jar missing on the client.

thanks for your prompt replies and help.

However I am getting new error in my application.

My application has Interceptor with following code

public class ApplicationIterceptor implements Interceptor {

public Object invoke(Invocation invocation) throws Throwable {

     EJBContainerInvocation ejb = (EJBContainerInvocation) invocation;
 
       Principal p =  ejb.getBeanContext().getEJBContext().getCallerPrincipal();

}

}

In jboss 4.3.2 ejb.getBeanContext() was returing value, however in jboss 6.0M2 it is returning null. Is there any change in thw way for getting CallerPrincipal in Jboss6?

thanks in advance.

[nagin.kothari]

Hi Jai,

any  clue why BeanContext is null in this case?

[jaikiran]

Nagin Kothari wrote:

My application has Interceptor with following code

public class ApplicationIterceptor implements Interceptor {

public Object invoke(Invocation invocation) throws Throwable {

     EJBContainerInvocation ejb = (EJBContainerInvocation) invocation;
 
       Principal p =  ejb.getBeanContext().getEJBContext().getCallerPrincipal();

}

}

In jboss 4.3.2 ejb.getBeanContext() was returing value, however in jboss 6.0M2 it is returning null. Is there any change in thw way for getting CallerPrincipal in Jboss6?

thanks in advance.

I haven't looked into the details yet, but why are you using a AOP interceptor and accessing JBoss internal classes to get hold of the caller principal?

[nagin.kothari]

Intention to use AOP interceptor was not to get to caller principal.It is written for getting context data  passed by client which are generic and not specific to bean method call(e.g  Locale). And also to pass on response data to client back through

invocation.setResponseContextInfo(responseMap); 

there i needed callerprincipal. In 4.3.2  , I  used get value for Beancontext as well as value for  invocation.getTargetObject(). but now both are null in case of 6.0M2

[jaikiran]

Post your -aop.xml configs where you have added your custom interceptor.

By the way, I would recommend that it's better to not rely on JBoss internal classes.

Intention to use AOP interceptor was not to get to caller principal.It is written for getting context data  passed by client which are generic and not specific to bean method call(e.g  Locale)

Can't it be done through javax.interceptor.* interceptors?

[nagin.kothari]

Yes context data coming from client is available through ejb interceptor , but can data be passed back to client through it. I do not think so.

that's why i have use AOP interecptor. Also client side interceptor is also AOP interceptor.

[jaikiran]

I guess you missed this part of my previous message?

jaikiran wrote:

Post your -aop.xml configs where you have added your custom interceptor.