Hi bob
There are several ways to try to find where this comes from
0) Check in the tomcat manager the status of memory. You may be running
out of java memory and so the garbage collector is running like crazy.
1) When issue arise, go to an AIX console (the timer is ticking, you
have 60 seconds according to your message) and send a SIGQUIT to the
java vm. You will get a complete thread dump of you javaprocess inside
catalina.out
2) run the webapp inside a tomcat itself running inside eclipse (there
are several eclipse plugin to do so), when this arise, suspend the java
process and analyse the Thread
3) If all else fail, play with a profiler, maybe you will get useful
infos from it
Search for dead lock and / or memory leaks
Also, nothing noticeable in catalina.out?
Bob Wyatt wrote:
Sorry, but this is re-request. My original request didn't elicit any
replies, so I thought I'd try again.
Our web application has a search feature that can be activated by pressing
the F2 key in Internet Explorer, or by clicking a small (978 bytes) gif
image file of a magnifying glass in our myapp/images directory.
This directory is populated with 45 gif image files, the largest being 144
KB, the smallest being 69 bytes, and the median being about 8 KB.
Occasionally, this search icon does not display; I'll get a black box for
several (10 - 15) seconds, then the image 'paints' in small spurts.
Even rarer are cases where we will click upon an action that should bring up
a new page, but after 60 seconds or so, we get the dreaded 'Page Not Found'
(PNF) message.
Whenever we get it, we have to disconnect and reconnect to the webapp; we do
not reboot the PC but must close Internet Explorer.
.
It seems that the faster the operator is, the more frequently the image
issue arises; about 3 times a day. The PNF occurs about twice a week.
There are no more than 6 users running the webapp when these all occur; this
is occurring on a development system.
Are there any diagnostic or logging activities in Tomcat that I can enable
to try to catch the culprit?
It does not appear to be a networking issue, as other connections to other
systems or the internet appear unaffected.
This is Tomcat 5.0.28 on AIX 5.2.
Regards,
Bob
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