Hi,
thanks a lot for the replies! I suppose having such list would be beneficial for a lot of people. "Migration Considerations" or something like this.
I can see there are two kinds of potential issues:
1. missing or changed (CMP, JAXR, JBossWeb Valves, etc) API
2. missing "features" - or generally stuff on somewhat higher level than Java API - such as the SAML issue - it may or may not be the result of the API changes. This can be somewhat tricky to identify, but I believe it should be documented if the feature was part of the JBoss AS 7 distribution.
Cheers,
Jaromir