This has been already done as part of AS7-1471 but has been subsequently reverted to 2.2.1.GA again. Git log message[1] indicates that this has been done as part of JBCTS-1075. However, I cannot see any direct relation between JBCTS-1075 and the version of RESTEasy on AS7 (perhaps a different issue?). Stuart, is there any chance to get 2.2.2.GA into AS7?

[1] https://github.com/jbossas/jboss-as/commit/1ee0f8f2996ff9e7c32e88153da6f32c448e28cd