FULL PRODUCT VERSION :
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux, windows 7 64 bit, verified bug in openjdk source code

A DESCRIPTION OF THE PROBLEM :
getPlatformManagementInterfaces throws an exception when it attempts to populate  a TreeSet of Class objects.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The below class will always throw an exception:

public class Fail
{
    public static void main(String[] args)
    {
        for (Class<?> c : java.lang.management.ManagementFactory.getPlatformManagementInterfaces())
        {
            System.out.println(c);
        }
    }
}


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The method should successfully return the collection of interfaces it says it will return instead of always failing.
ACTUAL -
$ javac -cp . Fail.java && java -cp . Fail
Exception in thread "main" java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.Comparable
        at java.util.TreeMap.compare(TreeMap.java:1188)
        at java.util.TreeMap.put(TreeMap.java:531)
        at java.util.TreeSet.add(TreeSet.java:255)
        at java.lang.management.ManagementFactory.getPlatformManagementInterfaces(ManagementFactory.java:792)
        at Fail.main(Fail.java:5)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Fail
{
    public static void main(String[] args)
    {
        for (Class<?> c : java.lang.management.ManagementFactory.getPlatformManagementInterfaces())
        {
            System.out.println(c);
        }
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
The data being accessed cannot be retrieved from outside the java.lang.management package.  The fix should be trivial (either use a HashSet instead of a TreeSet, or if sorting is really deemed desirable, provide a comparator for the treeset to use.)