OrionRemoteException: Error (de-)serializing object:

[Andres Garcia Hourcade]

Hi, i am new in J2EE technology and i'm big troubles.

I have an intranet application (jsp & ejb) running fine with version 1.4.0,
i am trying to deploy the same EAR in 1.5.2 version, but i get this error.

com.evermind.server.rmi.OrionRemoteException: Error (de-)serializing object:
org.gjt.mm.mysql.jdbc2.ResultSet; nested exception is:
java.io.NotSerializableException: org.gjt.mm.mysql.jdbc2.ResultSet

This error occurs when i return a ResultSet from a method "executeQuery" of
an EJB that manages de mysql db.

I have written many jsp, that are in production, and i woud not want to
modify them.
Is there any solution for this error ?
Can i solve this problem if i return a Vector, instead of a ResultSet ?

Many thanks in advance and best regards

Andres Garcia Hourcade

====================================
EJB
====================================
import java.rmi.*;
import java.util.*;

import javax.ejb.*;
import javax.naming.*;

import java.sql.*;
import javax.sql.*;
import javax.sql.DataSource;

// ejb que maneja archivos de log
import Log.*;

public class DbManagerBean implements SessionBean
{

   transient SessionContext context;
   transient Connection conn = null;
   transient DataSource ds = null;
   transient Statement st = null;
   transient ResultSet rs = null;

   public void getConnection(String datasource) throws RemoteException,
DbManagerException
   {
      try
      {
         InitialContext ictx = new InitialContext();
         this.ds = (DataSource) ictx.lookup(datasource);
         this.conn = this.ds.getConnection();
      }
      catch (Exception e)
      {
         throw new DbManagerException(e);
      }
   }


   public void closeConnection() throws RemoteException, DbManagerException
   {
      try
      {
         this.conn.close();
      }
      catch (Exception e)
      {
         throw new DbManagerException(e);
      }
   }

   public ResultSet executeQuery(String strsql, String logonuser) throws
RemoteException, DbManagerException
   {
      st = null;
      rs = null;
      try
      {
         //ResultSet.TYPE_SCROLL_INSENSITIVE,
         //ResultSet.CONCUR_READ_ONLY
         this.st = this.conn.createStatement();
         try{
           // logeo la consulta
           InitialContext context = new InitialContext();
           LogHome logHome = (LogHome)
javax.rmi.PortableRemoteObject.narrow(context.lookup("Log"), LogHome.class);
           Log log = logHome.create();
           log.writeDebug(strsql, logonuser);
           log.remove();
         }
         catch (Exception e)
         {
            throw new DbManagerException(e);
         }
         rs = this.st.executeQuery(strsql);
         // the closing of a statement also closes all
         // the resultsets asociated with the statement
         st.close();
      }
      catch (SQLException e)
      {
         throw new DbManagerException(e, this.conn);
      }
      return (rs);
   }

   public void ejbPassivate(){
       context = null;
       conn = null;
       ds = null;
       st = null;
       rs = null;
   }

   public void ejbActivate()
   {
   }

   public void ejbRemove()
   {

   }

   public void ejbCreate()
   {

   }

   public void setSessionContext(SessionContext context)
   {
      this.context = context;
   }

}