assertHasEntry( msg, name );
assertHasEntry( nextInterceptor, msg, name );
    public void modify( NextInterceptor nextInterceptor, Name name, int modOp, Attributes attrs ) throws NamingException    {        // check if entry to modify exists        String msg = "Attempt to modify non-existant entry: ";        assertHasEntry( msg, name );        nextInterceptor.modify( name, modOp, attrs );    }