--- a/src/hotspot/share/services/management.cpp	Thu Apr 25 05:54:54 2019 -0700
+++ b/src/hotspot/share/services/management.cpp	Thu Apr 25 10:56:31 2019 -0400
@@ -844,7 +844,7 @@
 static jint get_vm_thread_count() {
   VmThreadCountClosure vmtcc;
   {
-    MutexLockerEx ml(Threads_lock);
+    MutexLocker ml(Threads_lock);
     Threads::threads_do(&vmtcc);
   }
 
@@ -1704,7 +1704,7 @@
 
   ThreadTimesClosure ttc(names_ah, times_ah);
   {
-    MutexLockerEx ml(Threads_lock);
+    MutexLocker ml(Threads_lock);
     Threads::threads_do(&ttc);
   }
   ttc.do_unlocked();