jetty plugin for ant : How to define a jvmarg like javaagent?

I'm running an ant jetty task and i want to provide several jvmargs associated to j开发者_开发问答etty process : -Xmx -Dcom.sun.management.jmxremote.port -javaagent -...

Can't find any option available besides ANT_OPTS..

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See this example: http://ptrthomas.wordpress.com/2006/10/10/how-to-start-and-stop-jetty-from-ant/