JSR-174 introduced a standardized, JMX-based, management API for JVMs. The JRockit specific extensions to that API are known internally as the JMXMAPI. It is a set of MBeans that expose JRockit-specific behavior that is used by JRockit Mission Control. In JRockit, JMXMAPI has been around since R27, where it superseded the JSR-174 implementation from R26. JMXMAPI is not yet officially supported and has so far changed with every major release of JRockit.
See also JMX, JSR-174, and MBean.