I wrote a small tutorial for using Spring and JMX. I have implemented a BeanInfoAssembler that reads the MBean configuration from an XML-file.
It uses MX4J as JMX-Implementation.
Please try it and post your comments here.
You can download the zipfile from :
Its a working eclipse-projekt. Unzip and run the example. There are only 3 classes in this project. Some explanations are given in the pdf-file.