HI, I downloaded the drmaa.jar from : http://gridengine.sunsource.net/servlets/ProjectDocumentList?folderID=15&expandFolder=15&folderID=0 And i tried runnning a simple java code which imports the drmaa package,which was downloaded from gridway.org : *import org.ggf.drmaa.*; import java.util.*; public class Howto1 { public static void main (String[] args) { SessionFactory factory = SessionFactory.getFactory(); Session session = factory.getSession(); try { session.init(null); System.out.println("Session Init success"); System.out.println ("\t DRMAA version " + session.getVersion()); session.exit(); System.out.println("Session Exit success"); } catch (DrmaaException e) { e.printStackTrace(); } } }* But when i ran the java code,it gave me an exception: * Exception in thread "main" java.lang.NoClassDefFoundError: org/ggf/drmaa/DrmaaException* Please suggest a suitable solution Regards Santosh