June 20, 2006

Singleton in Spring

Today I found an error in my project related to the singleton in Spring.

A class Pager is a Spring bean injected to a controller by IoC container.
In one method of the controller, it use Pager.data variable to store submissions from a form.

If two threads send the request at the same time, then Pager.data was written twice. So potentially the controller will return wrong result for one form.

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