Hi all,
On my company, we have an issue with wicket 2.0 beta 3 and Resin 3.0.18.
After resin is active for a while, a stack trace occurs in the logfile with the following exception ...
FileNotFoundException (Too many open files). The exception occurs multiple times.
We have tested with our own application, and afterwards also with a clean resin installation with only the wicket sample application.
In both cases the problem occurs.
We are using SuSE 9.3 ( Linux linux01 2.6.11.4-21.7-smp #1 SMP Thu Jun 2 14:23:14 UTC 2005 x86_64 x86_64 x86_64 GNU/Linux )
on an intel xeon.
We are using Sun JRE:
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_06-b05, mixed mode)
Problem also occurs on JRockit:
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
BEA JRockit(R) (build R26.0.0-188-52875-1.5.0_04-20051110-0920-linux-x86_64, )
When investigating open file handles with lsof, it seems that the wicket jar files have a very high amount of open file handles (+/- 1000).
(I think the problem occurs when more than 1024 files are opened simultaneously)
All these file handles are allocated to the wicket jar files.
We have other resin instances running without wicket, and there the phenomenon does not occur,
so it is probably related to the combination Resin / Wicket.
Contents of /proc/sys/fs/file-max
203357
Contents of /proc/sys/fs/file-nr
5835 0 203357
Alle entries in /etc/security/limits.conf are commented out.
Resin is running as user root for testing purposes.
When investigating open file handles on other files, no extremely high file usage on other processes is detected.
Does someone have a clue what could be going on here? Has someone experienced something similar?
After googling for the problem, I did not bump in any eventual solution. All help would be welcome.
Thanks in advance for any reaction.
Tom Desmet
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