Identifies a JMX resource. Typically formatted as a String as jmx.domain:key=value,key=value where "jmx.domain" identifies groups of related components, and the keys and values give more information about the component in question (it's type, it's name, etc.). There is an Object*Name class that wraps the String with useful functions (to pull out individual properties, etc.). Creating an ObjectName from a String is expensive, but the Object*Name instances are cached if you call ObjectName.getInstance(String)