Callable Statement

I'm issuing the following using JT400 3.0 and v5r1 of OS/400. It creates a 
callable statement passing 2 parms.

import com.ibm.as400.access.*;
import java.math.*;
import java.sql.*;
import java.util.*;
import java.lang.*;
import java.io.*;


public class RpgCall02 {


    public static void main(java.lang.String[] args) {

       try {
       Class.forName("com.ibm.as400.access.AS400JDBCDriver");
       dsp("Class loaded");
       java.sql.DriverManager.registerDriver (new 
com.ibm.as400.access.AS400JDBCDriver ());
       dsp("Driver registered");
       Properties prop = new Properties ();
       prop.put("user", "user");
       prop.put("password", "password");
       AS400JDBCConnection c =  (AS400JDBCConnection)
          DriverManager.getConnection("jdbc:as400://spec00/;date 
format=iso;naming=sql", prop);
       AS400JDBCCallableStatement cs = (AS400JDBCCallableStatement)
          c.prepareCall("CALL zzbm1.javacall2(?, ?)");
       cs.setString (1, "BJM");
       cs.setString (2, "0000091834");
       cs.execute();
       cs.close();
       c.close();
       }
       catch(Exception ex) {
          ex.printStackTrace();
       }
      System.exit(0);
    }

 }


When I run this I get an [sql0204] JavaCall2 in zzbm1 type N* not found.

If I take out the parameters on both the Java pgm and the AS400 CL pgm it works 
fine.

Any ideas.

Thanks Barry