java.lang.noclassdeffounderror sun/io/unknowncharacterexception is displayed on connecting to DB2

Hi ,

I am getting java.lang.noclassdeffounderror sun/io/unknowncharacterexception  is displayed on connecting to DB2 from ready API 

Below is the code 

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.*;

try
{
// Load the DB2 Drivers
Class.forName("com.ibm.db2.jcc.DB2Driver");
// Establish Connection to DB2
Connection mConnection = DriverManager.getConnection("jdbc:db2://mvsnbdc-db2db2e:55100/Schema","XXXX","XXXX")

}
catch (ClassNotFoundException cnfe)
{
cnfe.printStackTrace();
}

for the line .get connection i am getting the mentioned Error 

I have added db2jcc4, db2jcc_license_cu jar files in bin/ext ..folder 

It could be good if this could be solved