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I have a global variable in a servlet class. What will happen to this global variable if two requests hit on the same time?

April 26, 2017class global hit requests servlet time

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I have a global variable in a servlet class. What will happen to this global variable if two requests hit on the same time?

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What will happen is an unforeseeable event. The best way to establish a default occurrence (the servlet handles a request at a time) is to synchronize the access to the global variable or alternatively to create a servlet that implements the SingleThreadModel interface.