--- jsr166/src/test/tck/JSR166TestCase.java	2016/09/15 00:32:45	1.202
+++ jsr166/src/test/tck/JSR166TestCase.java	2016/09/15 03:46:19	1.203
@@ -1005,14 +1005,17 @@ public class JSR166TestCase extends Test
         ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
         System.err.println("------ stacktrace dump start ------");
         for (ThreadInfo info : threadMXBean.dumpAllThreads(true, true)) {
-            String name = info.getThreadName();
+            final String name = info.getThreadName();
+            String lockName;
             if ("Signal Dispatcher".equals(name))
                 continue;
             if ("Reference Handler".equals(name)
-                && info.getLockName().startsWith("java.lang.ref.Reference$Lock"))
+                && (lockName = info.getLockName()) != null
+                && lockName.startsWith("java.lang.ref.Reference$Lock"))
                 continue;
             if ("Finalizer".equals(name)
-                && info.getLockName().startsWith("java.lang.ref.ReferenceQueue$Lock"))
+                && (lockName = info.getLockName()) != null
+                && lockName.startsWith("java.lang.ref.ReferenceQueue$Lock"))
                 continue;
             if ("checkForWedgedTest".equals(name))
                 continue;