"ellenzhao" wrote : There are two solutions: | | 1.delete the Janino compiler in Seam lib and use Eclipse compiler. You can get the Eclipse compiler after downloading the Drools 4.0 binary. In the drools/lib, you see a core-xxxx.jar. That is Eclipse compiler. Drop it into your Seam lib folder, edit your build.xml, edit your application.xml. | | Regards, | Ellen Thanks Ellen. I tried the first option, grabbing the Drools 4.0 distribution. I copied the lib over, and added <module> | <java>core-3.2.3.v_686_R32x.jar</java> | </module> to application.xml, and removed the janino.jar. After a clean build and making sure the jars were in test-build, I still get the same exception though. For the Seam guys, is this something new seam-gen users are expected to setup? Or has seam-gen not yet been updated since the drools update? Any suggestions are appreciated. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4068571#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...