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From Hans Wichman <>
Subject tomcat hangs, top displays 99%
Date Thu, 08 Jul 2004 11:35:25 GMT
while stresstesting my application using tomcat 4.1.29, oracle, dbcp 
connection pooling and a stresstest tool, I see the amount of my 
connections in my pool fluctuate (as expected). At a certain while I still 
have plenty connections left in the pool, errors start occuring:
org.apache.jasper.JasperException: setAttribute: Session already invalidated

and after this has happened for a while (some processing proceeds 
normally), I get:
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(
	at org.apache.jasper.servlet.JspServlet.service(
... root cause ...
	at org.apache.jsp.header_jsp._jspService(
	at org.apache.jasper.runtime.HttpJspBase.service(

at this point tomcat hangs. If I shutdown the stresstest tool, tomcat still 
displays at 99% when running top (freebsd).

Does anybody know why these errors occur, and why after stopping the 
stresstest, tomcat is still at 99%?
I don't see any out of memory errors or something like that, and don't 
really know where to start exploring the problem.

thanks in advance
Hans W

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