I got it, there was the another copy of the same version of the antlr jars on the classpath. However, now I get the following: | 12:20:16,037 ERROR [[/brgjava]] Session event listener threw exception | org.drools.rule.InvalidRulePackage: Unable to create Field Extractor for 'name' | Unable to create Field Extractor for 'action' | Unable to create Field Extractor for 'name' | | at org.drools.rule.Package.checkValidity(Unknown Source) | at org.drools.common.AbstractRuleBase.addPackage(Unknown Source) | at org.jboss.seam.drools.RuleBase.compileRuleBase(RuleBase.java:70) | My rules file is from the example: | package MyApplicationPermissions; | | import org.jboss.seam.security.PermissionCheck; | import org.jboss.seam.security.Role; | | rule CanUserDeleteCustomers | when | c: PermissionCheck(name == "customer", action == "delete") | Role(name == "admin") | then | c.grant(); | end; | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4028635#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...