Changing signature of Channel.down() breaks drop in replacement with JGroups <= 2.4

Changing the signatue for Channel.down() from:

void down(Event e);

to:

Object down(Event e);

Causes NoSuchMethodError to be thrown in JBoss 4.0.5.

This is not a super major issue (just need to recompile JBoss), but since our project doesn't like the idea of recompiling JBoss (want to get it directly from the site) it is a show stopper.

If drop-in replacement for JGroups <= 2.4 is a requirment, something will have to be done but the result of Channel.down() is only used in a few places, so it shouldn't be too much to get it to work.

It looks like it is just the JBoss HA service that uses Channel.down() explicitly.