Initial context factory error for websphere 6.1

[omkarj...@gmail.com]

hi
my code is :

Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory");
env.put(Context.PROVIDER_URL, "iiop://localhost:9060");
try
{
jndiContext = new InitialContext(env);
}
catch(NamingException ne)
{
System.out.println("Failed to create JNDI API. \n Context:"+ne.toString());
System.exit(1);
}
i am getting following exception....

java.lang.NoClassDefFoundError: com/ibm/CORBA/iiop/ObjectURL
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at com.ibm.websphere.naming.WsnInitialContextFactory.init_implClassCtor(WsnInitialContextFactory.java:172)
at com.ibm.websphere.naming.WsnInitialContextFactory.getInitialContext(WsnInitialContextFactory.java:112)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
at javax.naming.InitialContext.init(InitialContext.java:219)
at javax.naming.InitialContext.<init>(InitialContext.java:195)
at com.rnd.was.WASTopicSubscriber.main(WASTopicSubscriber.java:57)
Exception in thread "main"