The pool is designed for concurrent usage.

Up to <max-pool-size/> threads can be inside the pool at the same time (or using connections from a pool).

Once this limit is reached, threads wait for a period defined by <blocking-timeout-seconds/> to use the pool before throwing a NoManagedConnectionsAvailable exception.

The <allocation-retry/> and <allocation-retry-wait-millis/> elements let the pool retry a connection attempt before throwing the exception.