src/java.base/windows/classes/java/io/WinNTFileSystem.java

*** 41,51 ****
  class WinNTFileSystem extends FileSystem {
  
      private final char slash;
      private final char altSlash;
      private final char semicolon;
!     private final String userDir;
  
      public WinNTFileSystem() {
          Properties props = GetPropertyAction.privilegedGetProperties();
          slash = props.getProperty("file.separator").charAt(0);
          semicolon = props.getProperty("path.separator").charAt(0);
--- 41,52 ----
  class WinNTFileSystem extends FileSystem {
  
      private final char slash;
      private final char altSlash;
      private final char semicolon;
!     private String userDir;
!     private volatile boolean isUserDirNormal;
  
      public WinNTFileSystem() {
          Properties props = GetPropertyAction.privilegedGetProperties();
          slash = props.getProperty("file.separator").charAt(0);
          semicolon = props.getProperty("path.separator").charAt(0);
*** 351,361 ****
             we must look this up every time */
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) {
              sm.checkPropertyAccess("user.dir");
          }
!         return normalize(userDir);
      }
  
      private String getDrive(String path) {
          int pl = prefixLength(path);
          return (pl == 3) ? path.substring(0, 2) : null;
--- 352,372 ----
             we must look this up every time */
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) {
              sm.checkPropertyAccess("user.dir");
          }
!         boolean normalize = !isUserDirNormal;
!         if (normalize) {
!             synchronized(userDir) {
!                 normalize = !isUserDirNormal;
!                 if (normalize) {
!                     userDir = normalize(userDir);
!                     isUserDirNormal = true;
!                 }
!             }
!         }
!         return userDir;
      }
  
      private String getDrive(String path) {
          int pl = prefixLength(path);
          return (pl == 3) ? path.substring(0, 2) : null;