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From Jesse Klaasse <>
Subject Re: IIS 6.0 / JK1.2.25 / Tomcat 5.5.20 - "Service temporary unavailable"
Date Wed, 10 Dec 2008 08:48:48 GMT

After two months with a system running smoothly, we are currently
experiencing the same problems again (albeit less often).

A little update:
- The system's memory has been upgraded to 16 GB, Tomcat's memory settings
are Xms4096m and Xmx10240m now.
- We are using commons-dbcp 1.2.2 instead of Tomcat's internal pooling
mechanism, so with org.apache.commons.dbcp.BasicDataSourceFactory as data
source factory
- Java version is Sun JDK now. We are still at IIS 6.0, JK 1.2.26,
Tomcat 5.5.20 and APR 1.1.14.
- We have no automatic Tomcat reboots
- Currently this 503 hang happens about once or twice a week

Attached you will find a part of the isapi_redirector.log of today (the
whole morning 503 errors occurred). 
I also tried to create a thread dump using StackTrace while Tomcat was
hanging, but it didn't really work. The other JVM's were able to produce a
thread dump, and since all JVM's are part of the same group of services, I
have included this thread dump.

Any idea, anyone?

Jesse Klaasse wrote:
> Last Wednesday, I decided to try to use commons-dbcp (1.2.2) instead of
> the included naming-factory-dbcp.jar. Besides that, I have removed the
> "validationQuery" attribute, after reading about some problems with that.
> Since then, no problems have arised, Tomcat behaved nicely. I hope this
> finally has solved my problems. Still have to wait a few weeks before I
> can really say the system is stable. I keep my fingers crossed.

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