Q: I upgraded from JBoss 2.4.X (prior to 2.4.8) to JBoss 2.4.8 or later. I didn't change my connection configuration, but now I can't get a connection anymore, instead there is a strange error java.lang.RuntimeException: No ManagedConnections Available! WTF ?
A (davidjencks, gsuzor) : You need to provide a maxSize attribute to your pool. The examples in the old JBoss didn't have this, but the new ones do. The best thing is to take the example from the new one and reconfigure your data sources.