The Javadoc for RequiredModelMBean.load and .store says:
"Persistence is not supported by the this Model MBean implementation. An MBeanException wrapping a ServiceNotFoundException is thrown."
This is a confusion between the documentation of the Reference Implementation and the specification. The specification does NOT require an implementation not to support persistence. On p72 of the spec we read clearly that, for example, a J2EE-based implementation could support persistence in its RequiredModelMBean.