Hi,
we face to a problem where our classloader can't be finalized by the garbage
collector.
Let me shortly explain our context. We have an endless running application
which has the Jess library in its classpath. Additionally we load classes with
a custom classloader from separate jar files. These classes are used in
deftemplate from-class statements to be used in the engine. The custom
classloader is provided to the Rete (Rete.setClassLoader()).
I've analyzed the heap dump and found a lot of root reference chains to our
custom classloader. All of them contain the static map
jess.ReflectFunctions.s_descriptors. As far as I understand the code, there is
some kind of Bean introspection for classes used in deftemplate from-class
statements. The results of this introspection seem to be cached in this static
map. jess.ReflectFunctions is loaded by our application classloader and holds
static references to the deftemplate classes and hence to our custom
classloader.
The missing classloader finalization is critical in our scenario, because all
of its loaded classes remain in the PermGenSpace of the heap. As a result the
application will run into OutOfMemoryExceptions over time.
At the moment I have fixed this by implementing a static clean method in
jess.ReflectFunctions, which clears the map:
public static void clearDescriptorsCache(){
ReflectFunctions.s_descriptors.clear();
}
As jess.ReflectFunctions is a package protected class, I call this new function
from the Rete.clear() method:
m_deffacts.clear();
m_defglobals.clear();
m_classSource.clear();
//clear descriptor cache in ReflectFunctions to destroy root references
to business model classloader
ReflectFunctions.clearDescriptorsCache();
broadcastEvent(JessEvent.CLEAR, this, m_globalContext);
Two question, I have:
Might there be problems doing it this way? If the answer is no, is it possible
to include this as part of the next release?
Regards,
Ralf
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