The HotSpot thread MBean (object name java.lang:type=Threading) implementing java.lang.management.ThreadMXBean (http://docs.oracle.com/javase/7/docs/api/index.html?java/lang/management/ThreadMXBean.html) exposes an assortment of operations to retrieve ThreadInfo (http://docs.oracle.com/javase/7/docs/api/index.html?java/lang/management/ThreadInfo.html) for the different running threads. ThreadInfo contains a lot of information but non regard which thread group each thread belongs to.

It might be too much work to introduce a ThreadGroupInfo class to fully describe the group, but at least providing the thread group name would make it much simpler from a management point of view to sort the threads according to their grouping and responsibilities.