There was some discussion on dev about if and how context level clustering is supported in TC6.
From rereading that thread it's not clear to me whether or not it's OK to apply this patch. On the surface it seems harmless to just pass the cluster reference from the deployment plan on through to the tomcat objects But without a deeper understanding of whether or not tomcat6 does in fact respond correctly to that setting I am hesitant to do so.
It would be a big help if you could please take a moment to explain your clustering configuration and how you tested your patch. Another concern in my mind is whether or not Geronimo's existing support for Engine/Host level clustering might be adversely affected by making this change (I don't think so, but am not convinced yet).
Thanks for your help and cooperation.