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 need suggestions on implementing single user login , like My system has a user with a username jdavid and my application should not allow two different sessions for the same username jdavid , can one session peep into all other session
to see if the any has a usernaem jdavid, I am basically looking for some pattern if any available for restricting multiple session for the same username . like jaas or any other security api provides this ?