ManagedConnectionPool doesn't create new connection on JBossEAP

Issue

• Our DBA recently stops and restarts database on DEV machine every night.  Our application ( deployed as ejb) reads database. After the database comes back, the application still fails complaining ManagedConnectionFactory is null.  I noticed the same errors happened after I modified oracle-ds.xml file.

    FATAL[JdbcOperation.java:60][Cannot get database connection: You are trying to use a connection factory that has been shut down: ManagedConnectionFactory is null.;
    nested throwable: (javax.resource.ResourceException: You are trying to use a connection factory that has been shut down: ManagedConnectionFactory is null.)]