src/java.base/share/classes/jdk/internal/misc/InternalLock.java

*** 1,7 ***
  /*
!  * Copyright (c) 2021, 2022, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ---
  /*
!  * Copyright (c) 2021, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this

*** 37,14 ***
   */
  public class InternalLock {
      private static final boolean CAN_USE_INTERNAL_LOCK;
      static {
          String s = System.getProperty("jdk.io.useMonitors");
!         if (s != null && (s.isEmpty() || s.equals("true"))) {
-             CAN_USE_INTERNAL_LOCK = false;
-         } else {
              CAN_USE_INTERNAL_LOCK = true;
          }
      }
  
      private final ReentrantLock lock;
  
--- 37,14 ---
   */
  public class InternalLock {
      private static final boolean CAN_USE_INTERNAL_LOCK;
      static {
          String s = System.getProperty("jdk.io.useMonitors");
!         if (s != null && s.equals("false")) {
              CAN_USE_INTERNAL_LOCK = true;
+         } else {
+             CAN_USE_INTERNAL_LOCK = false;
          }
      }
  
      private final ReentrantLock lock;