Need an easy way to shutdown geotools without having memory leaks
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Key: GEOT-3330
URL: http://jira.codehaus.org/browse/GEOT-3330
Project: GeoTools
Issue Type: Bug
Affects Versions: 2.7-M3
Environment: Linux saiph 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16
20:36:48 UTC 2010 i686 GNU/Linux
Tomcat 6.0.29
Reporter: Robert Olofsson
Priority: Critical
Running tomcat and reloading the a webapp that uses some small parts of
geotools results in the following:
SEVERE: The web application [/bios] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.threadlo...@1624517]) and a value of
type
[org.geotools.referencing.operation.projection.TransverseMercator.Provider]
(value [PROJECTION["Transverse_Mercator"]]) but failed to remove it when the
web application was stopped. This is very likely to create a memory leak.
Dec 1, 2010 10:35:58 AM org.apache.catalina.loader.WebappClassLoader
clearThreadLocalMap
SEVERE: The web application [/bios] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.threadlo...@a5f70c]) and a value of
type [org.geotools.referencing.wkt.Formatter] (value []) but failed to remove
it when the web application was stopped. This is very likely to create a memory
leak.
Dec 1, 2010 10:35:58 AM org.apache.catalina.loader.WebappClassLoader
clearThreadLocalMap
SEVERE: The web application [/bios] created a ThreadLocal with key of type
[java.lang.ThreadLocal] (value [java.lang.threadlo...@a5f70c]) and a value of
type [org.geotools.referencing.wkt.Formatter] (value []) but failed to remove
it when the web application was stopped. This is very likely to create a memory
leak.
We already call:
org.geotools.util.WeakCollectionCleaner.DEFAULT.exit ();
org.geotools.referencing.factory.DeferredAuthorityFactory.exit ();
in a shutdown hook to remove some threads.
There is however no easy way to remove the ThreadLocals.
These classes are also classes that we do not use directly, they are used by
geotools internally and
it is quite time consuming to profile and try to figure out what classes that
may have a shutdown/remove/cleanup/exit
method and if that method actually works.
Wanted:
One class: org.geotools.util.ShutDownGeoToolsWithoutMemoryLeaks that has a
method shutdown() that does all the
neccessary calls to shutdown geotools without memory leaks.
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