src/java.base/windows/classes/sun/nio/fs/DefaultFileSystemProvider.java

8213406: (fs) More than one instance of built-in FileSystem observed in heap
Reviewed-by: alanb, cushon, weijun

*** 1,7 ****
  /*
!  * Copyright (c) 2008, 2009, 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) 2008, 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
*** 23,38 ****
   * questions.
   */
  
  package sun.nio.fs;
  
! import java.nio.file.spi.FileSystemProvider;
  
  /**
!  * Creates default provider on Windows
   */
  public class DefaultFileSystemProvider {
      private DefaultFileSystemProvider() { }
!     public static FileSystemProvider create() {
!         return new WindowsFileSystemProvider();
      }
  }
--- 23,52 ----
   * questions.
   */
  
  package sun.nio.fs;
  
! import java.nio.file.FileSystem;
  
  /**
!  * Creates this platform's default FileSystemProvider.
   */
  public class DefaultFileSystemProvider {
+     private static final WindowsFileSystemProvider INSTANCE
+         = new WindowsFileSystemProvider();
+ 
      private DefaultFileSystemProvider() { }
! 
!     /**
!      * Returns the platform's default file system provider.
!      */
!     public static WindowsFileSystemProvider instance() {
!         return INSTANCE;
!     }
! 
!     /**
!      * Returns the platform's default file system.
!      */
!     public static FileSystem theFileSystem() {
!         return INSTANCE.theFileSystem();
      }
  }