"kenevel" wrote : for example throwing a custom RuntimeException along the 
lines of a DataSourceTemporarilyUnavailableException. This could travel up the 
stack to the front-end and result in appropriate messages being generated for 
the system's users. 
Why can't you guys handle this in through the application without playing with 
the JCa pool Mbeans?
You can have a utility class which will get the connection from the underlying 
datasource and if it fails to get the connection due to unavailability of DB 
this utility class throws required application exception.
Looks to me you wanted to take care of this scenario
http://wiki.jboss.org/wiki/WhatHappensToJBossIfIRestartTheDatabase
 

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