今天在做EJB的一个简单的例子时，出现了如下异常：

 

今天在做EJB的一个简单的例子时，出现了如下异常：

log4j:WARN No appenders could be found for logger (org.jboss.remoting.Client).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" javax.naming.NamingException: Could notdereference object [Root exception isjava.lang.reflect.UndeclaredThrowableException]
at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1150)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:705)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.zzk.ejb.StatefulEjbClient.main(StatefulEjbClient.java:18)
Caused by: java.lang.reflect.UndeclaredThrowableException
at $Proxy0.createProxy(Unknown Source)
at org.jboss.ejb3.JndiProxyFactory.getObjectInstance(JndiProxyFactory.java:52)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1125)
at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1142)
... 4 more
Caused by: java.lang.ClassNotFoundException: [Lorg.jboss.aop.advice.Interceptor;
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:50)
at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveClass(ObjectInputStreamWithClassLoader.java:139)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1624)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:122)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:128)
at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66)
at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:279)
at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:143)
at org.jboss.remoting.Client.invoke(Client.java:525)
at org.jboss.remoting.Client.invoke(Client.java:488)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:48)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:61)
... 9 more

在百思不得其解的情况下，google了一下，原来是因为JDK版本的问题，由于我用的是JDK1。6版本所以出现了如上问题，用JDK1.5程序就可以正常运行了，

顺便将我查到的信息贴出来，为了更好的帮助大家：

Hi,

I've noticed that if you try to lookup a Stateful session bean - e.g.the ShoppingCart from the JBoss EJB3 tutorial - using jdk1.6 - then youget the following exception..

Exception in thread "main" javax.naming.NamingException: Could notdereference object [Root exception isjava.lang.reflect.UndeclaredThrowableException]

In fact this is the error you get when running the "run" target in the tutorial on 1.6..

Using jdk1.5 it works fine.

Anyone seen this. Is the error in JBoss or JDK1.6? Anyone reported this issue to Sun?

Best regards,