Take the 2-minute tour ×  Java EE app container provide
"failover" support for EJBs, in their docs never cite any
reasons why you would need to failover an EJB in the first
place!  When do these "failover" conditions take place and what
causes them? Is this just a situation where an exception is
thrown? Or is it possible for an app container to actually
"lose" or "break" an EJB?  Usually, when I've spoken of failover
in the past, its been a networking component like a server that
goes down for some reason. I'm just having a mental block here
trying to envision what would cause a piece of deployed software
to die and "fail over".  Bonus points for concrete examples
instead of just fuzzy, vague, abstract descriptions (!).
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down vote accepted  Java EE in general does not provide such
kind of failover that you talk about. If it's supported at all,
then it's a proprietary feature of a specific implementation.
Typically such failover would be for remote