Rmi Database communication(Please help)

Question

sir
i am trying to return a result set object to a client using rmi.but does not working properly it shows number of exception.but connection is established through it.
here is the coding of Implementation class.plese give me asolution as early as posssible
IMPLEMENTATION CLASS
import java.rmi.*;
import java.rmi.server.*;
import java.io.*;
import java.sql.*;
public class scmimpl extends UnicastRemoteObject implements scmintf,Serializable
     private ResultSet rs=null;
ResultSet rs1=null;
ObjectOutputStream os;
private Statement st=null;
private Connection con=null;
public scmimpl() throws RemoteException,IOException
public boolean Connect() throws RemoteException
     try{
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               con=DriverManager.getConnection("jdbc:odbc:mn1","scott","tiger");
               con.setAutoCommit(false);
               st=con.createStatement();
               return true;
     }catch(Exception e)
          return false;
public ResultSet Quest(String s) throws RemoteException,IOException,NotSerializableException,WriteAbortedException,MarshalException
try{
rs=st.executeQuery(s);
return rs;
catch(Exception e)
     System.out.println("error---->"+e);
     return rs=null;
public boolean Close()
try{
rs1.close();
}catch(Exception ex){}
return(true);
public int Update(String s)
int bl=0;
try{
bl=st.executeUpdate(s);
catch(Exception ex)
{System.out.println(""+ex);}
return bl;
public boolean Cancel()
try{
con.rollback();
return true;
catch(Exception e){return false;}
public boolean Submit()
try{
con.commit();
return true;
catch(Exception e){return false;}
INTERFACE CLASS
import java.rmi.*;
import java.sql.*;
import java.io.*;
public interface scmintf extends Remote
     boolean Connect() throws RemoteException,IOException;
     ResultSet Quest(String s) throws RemoteException,IOException,WriteAbortedException,WriteAbortedException;
     int Update(String s1) throws RemoteException;
     boolean Close() throws RemoteException;
     boolean Cancel() throws RemoteException;
     boolean Submit() throws RemoteException;
SERVER PROGRAM
import java.rmi.*;
import java.net.*;
public class scmServer
     public static void main(String arg[])
          try
               scmimpl SCMimpl=new scmimpl();
               Naming.rebind("scmServer",SCMimpl);
          catch(Exception e)
CLIENT PROGRAM
import java.rmi.*;
import java.sql.*;
import java.io.*;
public class client implements Serializable
     public static void main(String arg[])
          try
               String URL="rmi://localhost/scmServer";
                    scmintf SCMintf=(scmintf)Naming.lookup(URL);
                    boolean f=SCMintf.Connect();
                    System.out.println(""+f);
               //     int n=SCMintf.Update("insert into blogin values('naveen','naveen','a')");
               //     System.out.println(""+n);
                    //boolean f1=SCMintf.Submit();
          ResultSet rs1=SCMintf.Quest("select username from blogin where username='naveen'");
               //FileInputStream is =new FileInputStream("c:/Sale/Working/scmClient/t.tmp");
               //ObjectInputStream p=new ObjectInputStream(is);
               //rs1=(ResultSet)p.readObject();
               //is.close();
                    //     os.readObject();
          }catch(Exception e){
          System.out.println(e);
          e.printStackTrace();
sir these are the exception shown by the program
EXCEPTION
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:      java.io.WriteAbortedException: Writing aborted by exception; java.io.NotSerializableException: sun.jdbc.odbc.JdbcOdbcResultSetjava.rmi.UnmarshalException: error unmarshalling return; nested exception is:      java.io.WriteAbortedException: Writing aborted by exception; java.io.NotSerializableException: sun.jdbc.odbc.JdbcOdbcResultSetjava.io.WriteAbortedException: Writing aborted by exception; java.io.NotSerializableException: sun.jdbc.odbc.JdbcOdbcResultSet     at java.lang.Throwable.<init>(Throwable.java:96)     at java.lang.Exception.<init>(Exception.java:44)     at java.io.IOException.<init>(IOException.java:49)     at java.io.ObjectStreamException.<init>(ObjectStreamException.java:31)     at java.io.WriteAbortedException.<init>(WriteAbortedException.java:45)     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:242)     at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:304)     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:138)     at scmimpl_Stub.Quest(Unknown Source)     at client.main(client.java:15)Process Exit...
thanking you

Answer 1

I think the exception output held your answers:
java.io.WriteAbortedException: Writing aborted by exception;
... and ...
java.io.NotSerializableException: sun.jdbc.odbc.JdbcOdbcResultSet
Anything passed accross the network through RMI must be serializable ..and a ResultSet is not.
Try 'micro-managing' the results on the server side ...if that makes sense to you. Another alternative that I have tried (with ok results) is returning a two dimensional Object array ie: Object[][] that represents the ResultSet. Actually, I found that it works great.
  public static class MovieCapsule implements java.io.Serializable {
    public int mode;
    public Object[] data;
   /** MovieCapsule <I>default</I> Constructor */
    public MovieCapsule() {
      mode = -1;
      data = null;
   /** MovieCapsule <I>loaded</I> Constructor
    * @param md Sets the 'mode' integer.
    * @param dta Sets the Object[] data within the MovieCapsule.
    public MovieCapsule(int md, Object[] dta) {
      mode = md;
      data = dta;
  }This actually was used for a single row of results, but you get the idea. I've worked with a 2D array as well.