How to specify system-properties when WSO2 ESB started if deployed on top of an application server

When starting the WSO2 ESB server, we can specify different system-properties such as -DuseSynapseXML, -Dsetup, -Dcarbon.registry.root. But if you have deployed your WSO2 ESB instance on top of an Application server like JBoss or Tomcat, you will wonder how you can specify such options. To make this possible, all you have to do is follow the below steps.

Step 1 - Open a terminal window

Step 2 - Set the system-property which you want to set as a JAVA_OPTS variable
E.g.:- For linux - export JAVA_OPTS="-DuseSynapseXML"
For Windows - set JAVA_OPTS="-DuseSynapseXML"

Step 3 - Now start the Application server the usual way and you will notice that WSO2 ESB is started with the option which you set.
E.g.:- If you specified the system-property -DuseSynapseXML, notice that the server loads the synapse.xml located at the file system and not from the registry