a first JNDI programmer looking for help.....plz help

[dmjpro]

this is my code ... look at carefullyyyyy ...

import javax.naming.*;
import java.util.*;

class JNDITest
{
public static void main(String args[]) throws Exception
{
Hashtable tab = new Hashtable();
tab.put("Debasis","Moumita");
tab.put("Shyam","Mamata");
tab.put("Debabrata","Sujata");
Context ctx = new InitialContext(tab);
System.out.println("Debasis: " + ctx.lookup("Shyam"));
}
}

i just write in Oracle Jdeveloper 3.2.3 an try to run this ....

and i get .... javax.naming.NoInitialContextException Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial


why does it mean???? plz explain .......

any help is most welcome.....

thanxxxxx