@Override
    public void returnConnection(PoolableConnection poolableConnection) {
        // Do nothing.
    }
Configuration parameter that controls if a request for a new connection
should be queued until one becomes available or if it should cause an
exception to be thrown if no connection is available.
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/component/connectionpool/SingletonConnectionPoolComponent.java