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https://issues.apache.org/jira/browse/GERONIMO-4871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770567#action_12770567
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Quintin Beukes commented on GERONIMO-4871:
------------------------------------------

It has to be something that changed between that 2. I'm sure that part is 
obvious for anyone reading this.

It has to also be something the 2 does different. Perhaps related to a 
JavaAgent or JMX? Something else that captures the signal? 

Have you tried echoing the command geronimo.sh uses to start and then running 
it manually, removing arguments until you find on that could possibly trigger 
this? Does the same happen when you run the minimal server? Have you tried to 
remove modules until you could perhaps find one, which without it everything 
works?

If I had a Mac I would have a look at it, but ... :>

> Something blocking 'kill -3' signals?
> -------------------------------------
>
>                 Key: GERONIMO-4871
>                 URL: https://issues.apache.org/jira/browse/GERONIMO-4871
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>            Reporter: Kevan Miller
>             Fix For: 2.2.1
>
>
> I occasionally use 'kill -3' to cause a java process to dump all thread 
> stacks. For some reason, this isn't working on Geronimo 2.2

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