Index: threading.py
===================================================================
--- threading.py	(revision 6348)
+++ threading.py	(working copy)
@@ -213,7 +213,6 @@
 
 # relies on the fact that this is a CHM
 _threads = weakref.WeakValueDictionary()
-_active = _threads
 _jthread_to_pythread = Collections.synchronizedMap(WeakHashMap())
 
 class Thread(JavaThread):
@@ -294,6 +293,7 @@
         pass
 
     def __delete(self):
+        del _threads[self._thread.getId()]
         pass