Error in return of Vector method

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.

[1201 byte] By [alexmonassa] at [2007-11-26 12:18:02]