problem with rmi

[jayander kumar]

hi,

when i am trying to bind a object to a remote registry, iam gettting a exception.

exception is.

ComputeEngine exception: RemoteException occurred in server thread; nested exception i
s:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception i
s:
java.lang.ClassNotFoundException: ComputeEngine_Stub
java.rmi.ServerException: RemoteException occurred in server thread; nested exception
is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception i
s:
java.lang.ClassNotFoundException: ComputeEngine_Stub
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemote
Call.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:350)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at ComputeEngine.main(ComputeEngine.java:34)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exceptio
n is:
java.lang.ClassNotFoundException: ComputeEngine_Stub
Caused by: java.lang.ClassNotFoundException: ComputeEngine_Stub

i am running registry on different machine and the program in which iam binding binind the object on differnt machine.
can anybody help me.

[Nathan Pruett]

The base cause of this problem is -

 java.lang.ClassNotFoundException: ComputeEngine_Stub

How are you handling stubs in your program? Are you supplying them as files directly on the classpath, or are you using dynamic class loading to load them from a URL?

[jayander kumar]

hi
thanks for reply.

i am loading the class dynamically.


/***** this code binds the object ******/

import java.rmi.registry.*;



public class Bind{


public static void main(String[] args) {

if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
}


String name = "time";
try {



// TimeServer m = new TimeServer();


Properties p = System.getProperties();


String url = p.getProperty("java.rmi.server.codebase");


Class m = RMIClassLoader.loadClass(url,"TimeServer");


Registry remoteReg = LocateRegistry.getRegistry("vivek",1099);

remoteReg.rebind(name,(Remote) m.newInstance());

System.out.println("TimeServer bound");

} catch (Exception e) {

e.printStackTrace();
}
}
}


vivek is the system name on which i am running the registry.

i am loading the stub using codebase

java -Djava.security.policy=register.policy -Djava.rmi.server.codebase="http://deepak:8080/rmi/" Bind

deepak is my system name.

when i am trying to bind the object to my own registry it is working fine.

but when iam trying to bind to vivek machine's registry it is giving an exception.

java.rmi.ServerException: RemoteException occurred in server thread; nested exception
is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception i
s:
java.lang.ClassNotFoundException: TimeServer_Stub
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:352)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:207)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:
701)
at java.lang.Thread.run(Thread.java:536)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemote
Call.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:350)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at Bind.main(Bind.java:40)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exceptio
n is:
java.lang.ClassNotFoundException: TimeServer_Stub
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:342)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:207)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:
701)
at java.lang.Thread.run(Thread.java:536)
Caused by: java.lang.ClassNotFoundException: TimeServer_Stub
at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:207)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:427)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:159)
at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:629)
at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:257)
at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:200)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1503)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1425)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1616)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1264)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
... 9 more

kindly help..

[Nathan Pruett]

Which is line 40 in the Bind class? The RMIClassLoader line or the registry.rebind()?

Just to make sure, the TimeServer_Stub class is available on "http://deepak:8080/rmi/", right?

Unfortunately, I don't have multiple machines right now to test out running a registry on one machine and a codebase on another. I'll have to pull my old 475MHz machine out of the closet and get it set up when I get home