jmx, cruisecontrol + rmi / call method with arg

Hello,
I use CruiseControl which use MX4J to publish its interface to various protocols. I have built a working CruiseControl Connector which allows me to remotely trigger tasks. 

Among the methods that can be invoked there is one  which has a parameter, namely "buildWithTarget". My problem is how to correctly set the target parameter.

My call on MBeanServerConnection via RMI
	mbsc.invoke("myProject", "buildWithTarget", params, args);
always fails with the following exception:
at mx4j.server.ReflectionMBeanInvoker.invoke(ReflectionMBeanInvoker.java:61)
[cruiseConrolConnector]         at mx4j.server.interceptor.InvokerMBeanServerInterceptor.invoke(InvokerMBeanServerInterceptor.java:238)
[cruiseConrolConnector]         at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:120)
[cruiseConrolConnector]         at mx4j.server.interceptor.SecurityMBeanServerInterceptor.invoke(SecurityMBeanServerInterceptor.java:84)
[cruiseConrolConnector]         at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:120)
[cruiseConrolConnector]         at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:120)

How do I find out what to pass as params and args?

thanks for help.

jacques

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