[rules-users] Drools Classloader Leak?

[Mark Proctor]

Each kbase has it's own root classloader, and then an additional child 
classloader per package in the kbase.

Mark
On 07/05/2010 22:08, malkhafaji wrote:
> Hello,
>
> I noticed (using JConsole) that my application keeps loading more and more
> classes. I have over 105K classes loaded! I did a lot of debugging and
> isolation until I found the line that brings the number of classes loaded
> from 20K to 105K. It is this line:
>
> this.knowledgeBase.addKnowledgePackages(packages);
>
> packages is an array list of 8 DRLs that are compiled successfully. I am
> calling the line above exactly 99 times. However, I do have 99 instances of
> this.knowledgeBase. So, I have a total of 99 instances of "knowledgeBase",
> and each instance is called once (line above) with 8 successfully compiled
> DRLs.
>
> I am starting to think that each instance of a KnowledgeBase somehow uses
> its own Classloader? Do I need to manually get the current application
> Classloader and pass it on to each instance of KnowledgeBase to ensure that
> no classes are loaded more than once? Is this a leak in the Classloader that
> comes inside the KnowledgeBase.addKnowledgePackage method? I did post
> somewhere else about delays on the line above, and no wonder it sometimes
> takes a couple of seconds to execute that line (the largest rules file I
> have is 150 KB with no more than 100 rules) if it creates a new Classloader
> and loads the same loaded classes AGAIN. Any insights on this?
>
> P.S. I did a search on the forum and couldn't find anything related to this.
> If you have better searching skills and found a post in that regards, please
> kindly point me to it. This is a very important issue as we are going to a
> live production environment in 3 weeks and I am not too happy with the
> performance, specifically around the line above.
>
> Thank you, and have a great weekend.
>