destroySubcontext failing with NameNotFoudException

[N, Ravikiran]

Hi all,

I trying to understand under what conditions destroySubContext fails in 
tomcat..? I'm trying to destroy Context which I had created, because of which 
I'm unable to createContext the next time I start the service.  My code is 
below :

private Context srvCtx;
public void init(ServletConfig servletconfig) throws ServletException {
                Context initCtx = new InitialContext();
                srvCtx = initCtx.createSubcontext("myapp");
}

public void destroy() {
                try
                {
                                if (srvCtx != null)
                                {
                                                
srvCtx.destroySubcontext(GS_CTX_NAME);
                                                srvCtx.close();
                                }
                }
                catch(NamingException e)
                {
                                log_.error(new 
LogQueueMessageStructure("Couldn't unbind the context",3016),e);
                }
}

What is wrong with my code and also how can I debug this issue..? Please help 
me out..!!

Regards,
Ravikiran N