RESTEasy exception handling --------------------------- Key: JBSEAM-3265 URL: https://jira.jboss.org/jira/browse/JBSEAM-3265 Project: Seam Issue Type: Task Components: WS Reporter: Christian Bauer Assignee: Christian Bauer Fix For: 2.1.2.CR1 JAX-RS specifies the ExceptionMapper providers: The job of an ExceptionMapper is to convert an Exception instance to an HttpResponse. Two issues with that: RESTEasy does all that internally, that means once we dispatch a request to RESTEasy, we'll never get an exception out of the dispatcher call, only an HttpResponse. So we can't do internal cleanup of Seam contexts after an exception occurs. Second problem is that Seam has exactly the same functionality built-in, with ExceptionHandler and pages.xml declarations of mappings. So we definitely should give users the option to use that instead of writing a dozen ExceptionMapper classes. To get this working we need to get the exception out of the dispatcher invocation, to either call RESTEasy ExceptionMappers from outside of the dispatcher or to let it bubble up to the Seam ExceptionHandler so pages.xml can be used. This requires a rewrite of the exception handling in RESTEasy, the issue has been brought up on their dev mailing list.