You're right, a container is free to instantiate a servlet class multiple times 
as it sees fit. 

Recently, a customer proposed us to reimplement the JbpmThreadsServlet as a 
servlet context listener, which is guaranteed to execute only once. I filed the 
request as JBPM-742, but haven't found the time to implement it yet.

For backwards compatibility, static variables are not the right choice because 
you could have thread servlets in several web modules. The servlet context 
comes in handy here.

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