cshannon commented on PR #1659:
URL: https://github.com/apache/activemq/pull/1659#issuecomment-3909723905

   > I'm taking a look at this a bit more as something still doesn't add up. 
The fix here works but I'm not sure why it would be necessary.
   > 
   > I started playing with the unit test and when I debug it I see the message 
is being copied on dispatch, but all the consumers are receiving the exact same 
message reference so I am going to see if I can track down why.
   
   Oops neve rmind, I am getting different references (looking at the wrong 
thing) but I am still checking more into this to see if we can better pinpoint 
the issue vs just using synchronized. We can add it but it would be nice to 
know where exactly the issue is with multiple threads touching the message at 
the same time.


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