Hi team. 

We are using iron jacamar in our project. And we detected that, it introduced two threads indirectly to our system which can not be stopped during server shutdown process. 

Background : 

1) iron jacamar triggered jnpserver. 
-------
void com.github.fungal.impl.KernelImpl.startup()
void org.jboss.jca.embedded.EmbeddedJCA.startup()
void com.successfactors.sftomcat.EmbeddedIronJacamarInit.startContainer()
-------
void org.jnp.server.Main.start()
Object jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
Object jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[])
Object jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[])
Object java.lang.reflect.Method.invoke(Object, Object[])
Object com.github.fungal.impl.BeanDeployer.createBean(Bean, ClassLoader)
void com.github.fungal.impl.BeanDeployer.run()

2) jnpserver created two threads
RMI Reaper
-------
void sun.rmi.transport.ObjectTable.putTarget(Target)
void sun.rmi.transport.Transport.exportObject(Target)
void sun.rmi.transport.tcp.TCPTransport.exportObject(Target)
void sun.rmi.transport.tcp.TCPEndpoint.exportObject(Target)
void sun.rmi.transport.LiveRef.exportObject(Target)
Remote sun.rmi.server.UnicastServerRef.exportObject(Remote, Object, boolean) 
Remote java.rmi.server.UnicastRemoteObject.exportObject(Remote, UnicastServerRef)
Remote java.rmi.server.UnicastRemoteObject.exportObject(Remote, int, RMIClientSocketFactory, RMIServerSocketFactory)
void org.jnp.server.Main.initJnpInvoker() 
void org.jnp.server.Main.start()

pool-2-thread-1
-------
boolean java.util.concurrent.ThreadPoolExecutor.addWorker(Runnable, boolean)
void java.util.concurrent.ThreadPoolExecutor.execute(Runnable)
void org.jnp.server.Main.initBootstrapListener()
void org.jnp.server.Main.start()

Code analysis 

1, the threads are created by org.jnp.server.Main from lib org.jboss.naming:jnpserver-5.0.3.GA.jar
2, The thread pool is defined and injected from bean xml.

https://github.com/ironjacamar/ironjacamar/blob/1.5.12.Final/embedded/impl/src/main/resources/naming.xml#L5

Requirement

Could you please check if it is possible to make the started threads daemon, or have a way to let them respect shutdown hook, once inro jacamar function is stopped then these two threads can also be stopped.