Multiple requests sharing the same Servlet instance

[Keith Hankin]

I am having a problem where one Servlet instance seems to being used by two different 
threads at the same time. It is my understanding that Servlet instances will not be 
used by two threads at the same time, so that the service() method would thus only be 
called by one thread, then it can be called again if the Servlet instance is reused by 
way of pooling.