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I have a jsp application (using Spring) that uses a couple of global variables. I need multiple people to be able to use this program concurrently, however. What is the best way to go about making it thread-safe such that each instance of the program is independent of the others?
::EDIT:: Am I okay if I just don’t use any singleton objects?
Each request is handled in its own thread. These threads are managed by the servlet container. It is not a good idea to use static global variables in a servlet. All instance variables are common to all threads, therefore it can lead to ambiguous state.
I recommend saving this type information in a scope variable (application,session, request, page, etc).
If you have to use a global variable then you will need to synchronize the access to it to avoid unknown states.