[rules-users] Stack Overflow error when using Drool 4.0 pluggin in Eclipse Europa

Hi, I got the Stack Overflow error when I use Drool 4.0 pluggin. Here is what I did: I have been using Drool 3.0.6 pluggin for a while without anyproblem. Now I want to upgrade to 4.0, so I delete the old 3.0.6 pluggin, download the 4.0 pluggin from the website, then drop the org.drools.eclipse_4.0.0.jar to my Eclipse Europa's pluggin. It starts up my Eclipse just fine, I can see new Drool icon and menu. But when I open any .drl file, I got the Stack Overflow error. Any idea? Here is my Eclipse's parameter: -Xms384m -Xmx512m -XX:PermSize=128m -XX:MaxPermSize=128m Best Regards, Tim Nguyen