Error in return of Vector method

Question

Hi people, I have a problem if a program in runtime: i call a method in a client class named JRSimpleClient and then occur a message of error: NUllPOinterException . let see the server class:
the kind of return is Vector
Vector<Object> myVector = new Vector<Object>(1000);
  public Vector getCompleteResult(int id, String searchString) throws
     RemoteException, SQLException {
         jrc[id].performSearch(searchString);
         while (myVector.toString() != " ")
           result= jrc[id].getNextRow();
             myVector.add(result) ;
       return myVector;
      } so the performSearch and nextRow return a query (in database client.mdb)
the client class just call the method above
servlet.getCompleteResult(id,search);if anyone help me i 'll be thankfull.

Answer 1

while (myVector.toString() != " ") This is one of the strangest termination conditions I have ever seen. Are you seriously expecting one space as the only result of the query? Re-examine this.
It means your vector does not contain any value.Why would that cause an NPE?
@OP: can you provide the complete stack trace? Is the NPE happening directly in your client, or is it being thrown to you from the server?