stop-bamboo.sh does not work if jmx monitoring is enabled

Summary

stop-bamboo.sh does not work if JMX monitoring is enabled.

Steps to Reproduce

1. Enable JMX monitoring by adding -Dcom.sun.management.jmxremote.port=<portNum> to the startup parameters https://confluence.atlassian.com/bamboo0512/monitoring-and-profiling-bamboo-838556863.html
2. Start Bamboo
3. After Bamboo has started, stop Bamboo using stop-bamboo.sh

Expected Results

Bamboo is stopped

Actual Results

The below exception is thrown:

Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: <portNum>; nested exception is: 
	java.net.BindException: Address already in use

Workaround

Stop Bamboo by using kill <pid>