On 6/27/2013 1:31 PM, honyk wrote:
Dear All,
I am constantly encountering PermGen errors despite quite high
PermGen limit (even 512m) and many options set - approx once a week
under not heavy load.
I am trying to investigate what the app causes this, but I haven't
succeeded in reproducing it locally yet.
I found several articles about VisualVM (I hope it could help me to
determine some PermGen issues) and connecting it to the Tomcat.
Remotely. But I have no clue how can I conect the local VisualVM to
tomcat that runs on localhost.
Even here it is written:
http://tomcat.apache.org/tomcat-7.0-doc/monitoring.html
Enabling JMX Remote Note: This configuration is needed only if you
are going to monitor Tomcat remotely. It is not needed if you are
going to monitor it locally, using the same user that Tomcat runs
with.
But there is no further description for that simpler (local) method.
If it is obvious, sorry, but I am lost here ;-)
Thanks, Jan
It's actually very simple.
1. Start up Tomcat from startup.sh / startup.bat
2. Fire up visualvm
3. The Local node should have Tomcat visible
4. Double-click on the Tomcat element, and you're connected
Getting a first start on where your leaks are is pretty easy as well.
1. Load your web application
2. Run it to generate the leak
3. Unload it from Tomcat using the manager app (or any other method)
4. Do a Find Leaks from the manager app (or garbage collection from
VisualVM)
5. Do a heap dump
6. In the classes, look for org.apache.catalina.loader.WebappClassLoader
7. Find the instance where the boolean started is false
8. Right-mouse on the instance and search for nearest GC Root
9. Find classes that you wrote and fix
This gets the classLoader leak . . . others can be found by looking for
application - specific classes.
Hope this helps.
. . . just my two cents
/mde/
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