When I do the following:

1. Have a cluster of 2 nodes.
2. Create a BatchMessage on node 1.
3. Do not set orig_src
4. Send it to all members (destination null)

Then:

1. Node 1 (sender) receives it ok
2. Node 2 (other) does not receive it
3. I believe it is BatchMessage.size() that explodes with an NPE, but there is no log on any level on node 1 or 2 indicating something has gone wrong.

My first expectation was that orig_src is optional and does not need to be set, or that it's populated automatically (like sender in BaseMessage).

If it needs to be explicitly set then at least I would have expected a log somewhere indicating that the message could not be sent.

Tested with 5.3.5