javax.management.ObjectName should implement Comparable<ObjectName>. Even though it is not very meaningful to say that one ObjectName is "less than" another, by implementing Comparable we would allow a SortedSet<ObjectName> to show its contents in a reasonable order without having to define a custom Comparator. In particular, ObjectNames with the same domain should be grouped together.

The proposed semantics would be that name1.compareTo(name2) would be the same as name1.getCanonicalName().compareTo(name2.getCanonicalName()).