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With JBoss AS7 you can start a domain mode where instances can be administered accross different physical machines.
This mode includes a controller which will restart instances that are crashed.
See the admin document
According to the JBOSS AS 7 Administration Guide:
"It's important to understand that the choice between a managed domain and standalone servers is all about how your servers are managed, not
what capabilities they have to service end user requests."
Can you please advise how this "watch dog" can be configured also in standaloan mode with one managed server?
If you will have such "watch dog" you need to start in domain mode, there is no possibility for standalone mode. Only in domain mode you will have a controller (JVM process) that control the server instances.
So you might configure only one server in your case.