After stopping the server there is a bunch of daemon threads:
transaction-manager, AutoDeployer, DynamicReloader, pool-X-thread-Y.
Most of these threads (all except of some instances of pool-X-thread-Y) are
never finished until VM exit.
In the use case, when embedded GF is restarted many times during main
application session this can cause "Out-Of-Memory" problem and other side effects.