How JBoss EAP datasource failover work ?

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Issue

If one database becomes unavailable, will it switch to the 2nd database connection url provided without restarting the jboss server?
Once the primary database becomes available once again, after the switch, is it possible to switch back to it ?

Environment

JBoss Enterprise Application Platform (EAP)
- 4.2.0
- 4.3.0
- 5.x

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