Hi, I am facing a strange error now a days with Drool GUI. Whenever i am adding/modifying rules and built the rule, after that once I restart my application server its unable to connect with Drool and gives me error message java.lang.UnsupportedClassVersionError: unsupported classversion 50.0. If I remove my cahnges it started working fine. I am not sure why this error is coming. While googleing I come to know that it comes when java compiler is used lower version but since the project start my application java version is 5 and Drool Jboss javaversion is 6. But this error is occuring recently. Not sure why its coming and we are stucked due to this issue. Please let me know what wrong I am doing. Thanks, Amit -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-UnsupportedClassVersionError-... Sent from the Drools: User forum mailing list archive at Nabble.com.