I am running Weblogic 9.1 and Hibernate 3.1. I have read that there is the conflict between the ANTLR supplied by Weblogic and the ANTLR used by Hibernate 3.1. I have successfully got Hibernate running on my Weblogic server by adding the ANTLR jars before the WebLogic jars in the Weblogic classpath.

The other supplied "solution" is to use the classic query parser (Hibernate 2's parser). I was curious to know what the performance impacts and compatibility problems that I might get if I choose to use the classic query parser.

Thanks for your help/insight.