diff -r a8dcacf95bff -r 1126f0607c70 src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.cpp
--- a/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.cpp	Thu Apr 25 05:54:54 2019 -0700
+++ b/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.cpp	Thu Apr 25 10:56:31 2019 -0400
@@ -123,7 +123,7 @@
 }
 
 size_t JfrStackTraceRepository::clear() {
-  MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
+  MutexLocker lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
   if (_entries == 0) {
     return 0;
   }
@@ -142,7 +142,7 @@
 }
 
 traceid JfrStackTraceRepository::add_trace(const JfrStackTrace& stacktrace) {
-  MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
+  MutexLocker lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
   const size_t index = stacktrace._hash % TABLE_SIZE;
   const StackTrace* table_entry = _table[index];
 
@@ -238,7 +238,7 @@
 }
 
 size_t JfrStackTraceRepository::write_impl(JfrChunkWriter& sw, bool clear) {
-  MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
+  MutexLocker lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
   assert(_entries > 0, "invariant");
   int count = 0;
   for (u4 i = 0; i < TABLE_SIZE; ++i) {