Javassist ProxyFactory does not handle interfaces with generics correctly. -------------------------------------------------------------------------- Key: JASSIST-184 URL: https://issues.jboss.org/browse/JASSIST-184 Project: Javassist Issue Type: Bug Affects Versions: 3.17.0-GA Reporter: Eduardo Macarron Assignee: Shigeru Chiba Fix For: 3.18.0-GA Attachments: testinterfaces.tar.gz We included Javassist support for MyBatis 3.2.0. We had an issue regarding generics. http://code.google.com/p/mybatis/issues/detail?id=664 We have isolated it and looks like this is a problem in Javassist. CGlib works fine in the same scenario.