diff -r f604d14c8132 -r a80638fa1a8c src/java.desktop/windows/classes/sun/awt/shell/Win32ShellFolder2.java
--- a/src/java.desktop/windows/classes/sun/awt/shell/Win32ShellFolder2.java	Thu Jul 05 13:26:50 2018 +0200
+++ b/src/java.desktop/windows/classes/sun/awt/shell/Win32ShellFolder2.java	Thu Jul 05 19:05:08 2018 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 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
@@ -170,7 +170,7 @@
     }
 
     // Known Folder data
-    static class KnownFolderDefinition {
+    static final class KnownFolderDefinition {
         String guid;
         int category;
         String name;
@@ -187,7 +187,10 @@
         String ftidType;
         String path;
         String saveLocation;
-        static final List<KnownFolderDefinition> libraries = getLibraries();
+    }
+
+    static final class KnownLibraries {
+        static final List<KnownFolderDefinition> INSTANCE = getLibraries();
     }
 
     static class FolderDisposer implements sun.java2d.DisposerRecord {
@@ -625,7 +628,7 @@
         // this is a temp fix until java.io starts support Libraries
         if( path != null && path.startsWith("::{") &&
                 path.toLowerCase().endsWith(".library-ms")) {
-            for (KnownFolderDefinition kf : KnownFolderDefinition.libraries) {
+            for (KnownFolderDefinition kf : KnownLibraries.INSTANCE) {
                 if (path.toLowerCase().endsWith(
                         "\\" + kf.relativePath.toLowerCase()) &&
                         path.toUpperCase().startsWith(