This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
I have impelemented one application for getting the details of particular customer that is available in the database for this i created one login page with login.jsp in this i have two setter's and getter's with the name FirstName and LastName. And it contains one submit button.
When i am clicking on submit button i am getting
why i am getting this error. In which situatin it will occur please clarify my doubt as soon as...