From hudson logs:

2010-04-05 03:07:48,034 ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (RMI TCP Connection(4)-127.0.0.1) Error installing to PostClassLoader: name=vfs:///qa/services/hudson/hudson_workspace/workspace/JBoss-AS-6.0.x/JBossAS_6_0/testsuite/output/lib/log4j113-ejb.jar state=ClassLoader mode=Manual requiredState=PostClassLoader: org.jboss.deployers.spi.DeploymentException: Error during deploy: vfs:///qa/services/hudson/hudson_workspace/workspace/JBoss-AS-6.0.x/JBossAS_6_0/testsuite/output/lib/log4j113-ejb.jar
at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:185)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1857)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1575)
at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1516)
at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:377)
at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:2042)
at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:1081)
at org.jboss.dependency.plugins.AbstractController.executeOrIncrementStateDirectly(AbstractController.java:1320)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1244)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1137)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:937)
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:652)
at org.jboss.deployers.plugins.deployers.DeployersImpl.change(DeployersImpl.java:2008)
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:1101)
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:679)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:370)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:271)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:670)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1426)
at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1264)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1359)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:788)
at sun.reflect.GeneratedMethodAccessor289.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at org.jboss.ejb3.singleton.deployer.EJB3DeploymentDeployer.deploy(EJB3DeploymentDeployer.java:88)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:179)
... 42 more