HQL/SQL query translator error on SJSAS 8.1 EE

I encountered an error while executing hibernate query in my app and the log message is shown below.

[#|2006-09-20T13:27:02.956-0400|WARNING|sun-appserver-ee8.1_02|javax.enterprise.system.stream.err|_ThreadID=12;|

CharScanner; panic: ClassNotFoundException: org.hibernate.hql.ast.HqlToken|#]

I am using HIberante 3 and I do have antlr-2.7.2.jar in my classpath. And I am using org.hibernate.hql.classic.ClassicQueryTranslatorFactory class instead of

org.hibernate.hql.ast.ASTQueryTranslatorFactory. I have also added the antlr-2.7.2.jar in classpath-prefix in domain.xml. Did anybody encounter the same problem? Please advice.

Thanks.

[674 byte] By [ndnguy] at [2007-11-26 10:16:49]