JGroups ForkChannel can hold references to Hibernate SessionFactoryImpl which cause memory leak

    <properties>
        <property name="hibernate.cache.use_query_cache" value="true"/>
        <property name="hibernate.cache.use_second_level_cache" value="true"/>
        <property name="hibernate.cache.region.factory_class" value="org.jboss.as.jpa.hibernate5.infinispan.SharedInfinispanRegionFactory"/>
    </properties>

Class Name                                                                                                  | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap
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channel org.jgroups.JChannel @ 0xc0eac6a0                                                                   |            1 |          112 |               136 |           448
'- channel_listeners java.util.concurrent.CopyOnWriteArraySet @ 0xc0ecd260                                  |            1 |           16 |               136 |           112
   '- al java.util.concurrent.CopyOnWriteArrayList @ 0xc0ecd270                                             |            1 |           24 |               136 |            96
      '- array java.lang.Object[2] @ 0xc0ecd2b8                                                             |            1 |           24 |               136 |            24
         '- [0] org.jgroups.fork.ForkChannel @ 0xc103d250                                                   |            1 |          120 |               136 |         1 328
            '- channel_listeners java.util.concurrent.CopyOnWriteArraySet @ 0xc103d350                      |            1 |           16 |               136 |           968
               '- al java.util.concurrent.CopyOnWriteArrayList @ 0xc103d360                                 |            1 |           24 |               136 |           952
                  '- array java.lang.Object[1] @ 0xc103d3a8                                                 |            1 |           24 |               136 |           880
                     '- [0] org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher @ 0xc103d1f0|            1 |           96 |               136 |           856
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    /** Closes the fork-channel, essentially setting its state to CLOSED. Note that - contrary to a regular channel -
     * a closed fork-channel can be connected again: this means re-attaching the fork-channel to the main-channel*/
    @Override
    public void close() {
        ((ForkProtocolStack)prot_stack).remove(fork_channel_id);
        if(state == State.CLOSED)
            return;
        disconnect();                     // leave group if connected
        prot_stack.destroy();
        state=State.CLOSED;
        notifyChannelClosed(this);
	this.clearChannelListeners(); // <-- this is the line I added
    }