I want to write a very simple GUI asking user to input his/her database uid and pwd. If the login is accepted or rejected, they will see the corresponding pages. Just wondering how to check if the uid/pwd for database is correct ? just try to build a database Connection using the GUI's input uid/pwd ? and if there is no SQLException then it is ok, or it fails ? But it seems SQLException can be caused by other database problem other than incorrect uid/pwd... How to exactly check if the uid/pwd is correct ?