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From Stéphane PURNELLE <>
Subject Question about thread management
Date Fri, 11 Dec 2009 09:48:31 GMT
Hi all,

Server description :  tomcat 6.0.16, jdk 6.0.7 64-bits, RedHal EL 4.8 
64-bits, mod-jk enabled.

On this server, we have 2 servlets managed by tomcat and some java 
programs which run by cron.

all run fine except sometimes we have a java hotspot :

# An unexpected error has been detected by Java Runtime Environment:
#  Internal Error (nmethod.cpp:1707), pid=7204, tid=1134967136
#  Error: guarantee(cont_offset != 0,"unhandled implicit exception in 
compiled code")
# Java VM: Java HotSpot(TM) 64-Bit Server VM (10.0-b23 mixed mode 
# If you would like to submit a bug report, please visit:

and servlet hang.  We must restart tomcat.

One of servlets contain more than 20 threads.
The other servlet is developed by a external society and I don't know what 
this servlet do.

The problem start when a java program (not a servlet) run.
This program have two part and the second part start a thread.

We tried to avoid the program by change the cron time of program without 

and now, I would like to know if there are some parameters for manage the 
number of thread supported by tomcat or java.
It's maybe a java problem, but how to ensure that tomcat will not hang by 
a thread "overburn".


        Stéphane Purnelle

Stéphane PURNELLE                         Admin. Systèmes et Réseaux 
Service Informatique       Corman S.A.           Tel : 00 32 (0)87/342467
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