princesshan1977 princesshan1977 [http://community.jboss.org/people/princesshan1977] created the discussion "java client use ejb remote service, exception(jboss5.0 + jdk1.6)" To view the discussion, visit: http://community.jboss.org/message/641181#641181 -------------------------------------------------------------- I  use myeclise + jboss-5.1.0.GA   + jdk1.6 service code like this   @Remote public interface IHelloEJBService { public String sayHelloEJB(String name); } @Stateless public class HelloEJBService implements IHelloEJBService { public String sayHelloEJB(String name) {   // TODO Auto-generated method stub   String msg = "hello" + name + ", Welcome to EJB world!";   System.out.print(msg);   return msg; } } then I deploy the service。 I create  a new  java   client   project，code like this public class TestClient { private static Context context; /**   * @param args   */ public static void main(String[] args) {     try   {    Context ctx = getInitialContext();    Object object = ctx.lookup("HelloEJBService/remote");    IHelloEJBService service= (IHelloEJBService)PortableRemoteObject.narrow(object, IHelloEJBService.class);    System.out.println(service.sayHelloEJB("Client "));   }   catch(Exception e)   {    e.printStackTrace();   } } protected static Context getInitialContext() throws Exception {   if(context == null)   {    Hashtable props = new Hashtable();    props.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");    props.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");    props.put(Context.PROVIDER_URL, "jnp://localhost:1099");    context = new InitialContext(props);   }   return context; } } I  copy  all jars of    D:\jboss-5.1.0.GA\client\    to  client project   and   add  all to classpath. run  the  client  code  ，occur  exception javax.naming.NamingException: Could not dereference object [Root exception is java.lang.reflect.UndeclaredThrowableException] at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1504) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:822) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686) at javax.naming.InitialContext.lookup(InitialContext.java:392) at TestClient.main(TestClient.java:18) Caused by: java.lang.reflect.UndeclaredThrowableException at $Proxy0.createProxyBusiness(Unknown Source) at org.jboss.ejb3.proxy.impl.objectfactory.session.SessionProxyObjectFactory.createProxy(SessionProxyObjectFactory.java:129) at org.jboss.ejb3.proxy.impl.objectfactory.session.stateless.StatelessSessionProxyObjectFactory.getProxy(StatelessSessionProxyObjectFactory.java:79) at org.jboss.ejb3.proxy.impl.objectfactory.ProxyObjectFactory.getObjectInstance(ProxyObjectFactory.java:158) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304) at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1479) at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1496) ... 4 more Caused by: java.lang.ClassNotFoundException: com.test.ejb.IHelloEJBService at org.jboss.remoting.serialization.ClassLoaderUtility.loadClass(ClassLoaderUtility.java:103) at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:86) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveProxyClass(ObjectInputStreamWithClassLoader.java:253) at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732) 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:119) 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.receiveObjectVersion2_2(JavaSerializationManager.java:238) at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:138) at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:123) at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedRead(MicroSocketClientInvoker.java:1220) at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:850) at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:165) at org.jboss.remoting.Client.invoke(Client.java:1724) at org.jboss.remoting.Client.invoke(Client.java:629) at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.proxy.impl.remoting.IsLocalProxyFactoryInterceptor.invoke(IsLocalProxyFactoryInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62) at $Proxy0.createProxyBusiness(Unknown Source) at org.jboss.ejb3.proxy.impl.objectfactory.session.SessionProxyObjectFactory.createProxy(SessionProxyObjectFactory.java:129) at org.jboss.ejb3.proxy.impl.objectfactory.session.stateless.StatelessSessionProxyObjectFactory.getProxy(StatelessSessionProxyObjectFactory.java:79) at org.jboss.ejb3.proxy.impl.objectfactory.ProxyObjectFactory.getObjectInstance(ProxyObjectFactory.java:158) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304) at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1479) at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1496) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:822) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686) at javax.naming.InitialContext.lookup(InitialContext.java:392) at TestClient.main(TestClient.java:18) at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.proxy.impl.remoting.IsLocalProxyFactoryInterceptor.invoke(IsLocalProxyFactoryInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62) ... 11 more -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/641181#641181] Start a new discussion in EJB Development at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]