HornetQ memory leak using jBPM Human Task component in BRMS 5.3.1

Issue

We are running load tests with the jBPM Human Task component. We have already applied the one-off patch mentioned in https://access.redhat.com/site/solutions/772333, which has fixed the big ramp in memory comsumption. But there is still something HornetQ related being accumulated in within a day of intermediate load (running the test with 300 parallel threads).

Looking at the heap dump with MemoryAnalyzer showed the following leak suspects:

1) One instance of "org.hornetq.core.client.impl.ClientSessionImpl" loaded 
by "org.jboss.classloader.spi.base.BaseClassLoader @ 0x788eb4ad8" 
occupies 346,468,576 (28.80%) bytes. The memory is accumulated in one 
instance of "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded 
by "<system class loader>".

2) One instance of "org.jbpm.task.service.hornetq.HornetQTaskClientHandler" 
loaded by "org.jboss.classloader.spi.base.BaseClassLoader @ 0x788eb4ad8" 
occupies 209,507,600 (17.41%) bytes. The memory is accumulated in one
instance of "java.util.HashMap$Entry[]" loaded by 
"<system class loader>".