Call to imbedded servlet results in new session

I have a servlet which generates a PDF document.  Within this servlet is a
call to another servlet that generates a chart to be inserted into the PDF.
The problem I have is that the call to the chart servlet creates a new
session.  I need it to be the same session so I can read some session
variables.  I talked to the PDF library author and he said that it is not
the normal behavior; it should keep the same session.

Any ideas on how I can force it to be the same session?  Thanks,
Kenny

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