Memory leakage

What is memory leakage?
It is nothing but if your jvm cannot provide heap size that your application requires at runtime then memory leakage takes place.
Todays industry are facing a great problem with this the reason basically for this is creating unnessary objects.And also care has not been taken while creating session object which pays a high penalty.Imagine a web application where a 1000 user hits persecond and we have created session objects without having any thought so imagine what is going to happen.
To avoid this lets create only one session per user.For that you have to create session like this
HttpSession session =request.getSession(false);
what it will do if a session object is already there it wont create a new one as regard to true or void arguement of getSession method of request object.