When you uses JGroups 2.4.1 with JBoss 4.0.5.GA, you get a lot of "deprecated" warning. Most can be erase use the proper configuration in XML, however, i fail to find an XML attributes to remove this one:

21:27:32,566 WARN [JChannel] option GET_STATE_EVENTS has been deprecated (it is always true now); this option is ignored

... This is far from a major issue, but some customers get very worried by ANY warning message...