8340276: Test java/lang/management/ThreadMXBean/Locks.java failed wit…

…h NullPointerException

Reviewed-by: cjplummer, lmesnik

test/jdk/java/lang/management/ThreadMXBean/Locks.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -422,6 +422,9 @@ private static ThreadInfo findOwnerInfo(ThreadInfo[] infos, String lock)
  lock + " expected to have owner");
  }
  for (ThreadInfo info1 : infos) {
+ if (info1 == null) {
+ continue; // Missing thread, e.g. completed. Ignore.
+ }
  if (info1.getThreadId() == threadId) {
  ownerInfo = info1;
  break;