Need RMI help with upgrading a legacy application on WebSphere 5.1

[Chris Saumenig]

Hi,

I've been asked to help support the upgrade of a legacy application from WAS 3.5 to WAS 5.1, with little to no documentation present on the app itself. Bascially the application contains one servlet that binds an object to the RMI registry in WebSphere using the init() method.

As part of the upgrade, I've taken the source code I found, and rebuilt it, using ant for compiling the classes, then creating the RMI stubs/skeletons (<rmic> task). I'm able to compile an .ear file, and deploy it to the server. When I start the application, I'm receiving the following error in the server logs:

error binding my factory: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: com.foo.MyFactory_Stub (no security manager: RMI class loader disabled)

Here is the code:

Servlet:

  package com.foo;

import java.rmi.Naming;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

public class BinderServlet extends HttpServlet {

  public void init(ServletConfig parm1) throws ServletException {
    try {
      Naming.rebind("MyFactory",new Factory());
    } catch(Exception e) {
      System.out.println("error binding my factory: " + e.getMessage());
    }
  }
}  

Interface:

 package com.foo;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface MyFactoryRemote extends Remote {
  public MyRemote getRemote(String sProvider,
                            String sService,
                            String sVersion) throws RemoteException;
}   

Remote Object:

package com.foo;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class MyFactory extends UnicastRemoteObject implements MyFactoryRemote {
  public MyFactory() throws RemoteException {
    super();
  }
  
  public MyRemote getRemote(String sProvider,
                            String sService,
                            String sVersion) throws RemoteException {
    return new MyRemote(sProvider, sService, sVersion);
  }
}

And finally, the class:

package com.foo;

public class MyRemote {
  public MyRemote(String sProvider,
                  String sService,
                  String sVersion) {
  }
}

I'm sure there's some setup that I am missing, and not being exceptionally familiar with RMI, it may be something very simple. Any help would be greatly appreciated.

Thanks,
Chris

[Nitesh Kant]

This error comes when the program during an RMI call try to de-serialize (unmarshall) an object, the class definition for which is not present in the local JVM.
The stub classes you have created must be available in the classloader of the code throwing this exception.