Is synchronization within an HttpSession feasible?

Question

UPDATE: Solution right after question.

Question:

Usually, synchronization is serializing parallel requests within a JVM, e.

Answer 1

The answers are correct. If you want to avoid the same user executes 2 different (or the same) requests at the same time, you can synchronize on the HttpSession. The best to do this is to use a Filter.

Notes:

• if your resources (images, scripts, and any non-dynamic file) also comes through the servlet, you could create a bottleneck. Then be sure, the synchonization is only done on dynamic pages.
• Try to avoid the getSession directly, you should better test if the session already exists because a session is not automatically created for guests (as nothing has to be stored in the session). Then, if you call getSession(), the session will be created and memory will be lost. Then use getSession(false) and try to deal with the null result if no session already exists (in this case, don't synchronize).