src/java.base/share/classes/java/io/DeleteOnExitHook.java

*** 1,7 ****
  /*
!  * Copyright (c) 2005, 2018, 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) 2005, 2019, 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
*** 62,71 ****
--- 62,77 ----
          }
  
          files.add(file);
      }
  
+     static synchronized void remove(String file) {
+         if(files != null) {
+             files.remove(file);
+         }
+     }
+ 
      static void runHooks() {
          LinkedHashSet<String> theFiles;
  
          synchronized (DeleteOnExitHook.class) {
              theFiles = files;