I am getting this error while trying to create a connection pool, on my Oracle database, Oracle 10gR2.

java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1
ORA-12705: Cannot access NLS data files or invalid environment specified

I am able to connect to the database over sqlplus & iSQLPlus client, but when I try to connect using this Java program, I get this error just when the connection pool is to be initialised and it does not initialise the connection pool.

Can someone please help me resolving it?

DB Version: Oracle version 10.2.0.1

OS: RHEL 4.0

Here is a barebone, java code which is throwing this error, while connecting to my database.

import java.sql.*;

public class connect{
    public static void main(String[] args) {
    	Connection con = null;
    	CallableStatement cstmt = null;

    	String url = "jdbc:oracle:thin:@hostname:1521:oracle";
    	String userName = "username";
    	String password = "password";

    	try
    	{
    		System.out.println("Registering Driver ...");
    		DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());

    		System.out.println("Creating Connection ...");
    		con = DriverManager.getConnection(url, userName, password);

    		System.out.println("Success!");

    	} catch(Exception ex) {
    		ex.printStackTrace(System.err);
    	  } finally {
    		if(cstmt != null) try{cstmt.close();}catch(Exception _ex){}
    		if(con != null) try{con.close();}catch(Exception _ex){}
    	    }
    }

}