references to fact handles not being removed when objects are removed from memory. Converted our application from 5.0.1 to 6.1_Final and encountered memory leaks in the drools processing. Found references to defect 498 and checked out the 6.1.1 code based and built the source (the download package doesn't seem to have these fixes). The majority of leaks were corrected with this code line, however there still remains a memory leak when we run our defined rules. Even though a rule never fires, it's evaluation seems to hold onto beta memory forever and the test application will eventually run out of memory. I can provide a test program that highlights the leak.