modules/javafx.media/src/main/java/com/sun/media/jfxmedia/locator/ConnectionHolder.java

*** 1,7 ****
  /*
!  * Copyright (c) 2010, 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) 2010, 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
*** 254,264 ****
              String scheme = uri.getScheme().toLowerCase();
              return ("http".equals(scheme) || "https".equals(scheme));
          }
  
          boolean isSeekable() {
!             return (urlConnection instanceof HttpURLConnection) || (urlConnection instanceof JarURLConnection);
          }
  
          boolean isRandomAccess() {
              return false;
          }
--- 254,266 ----
              String scheme = uri.getScheme().toLowerCase();
              return ("http".equals(scheme) || "https".equals(scheme));
          }
  
          boolean isSeekable() {
!             return (urlConnection instanceof HttpURLConnection) ||
!                    (urlConnection instanceof JarURLConnection) ||
!                    isJRT();
          }
  
          boolean isRandomAccess() {
              return false;
          }
*** 295,305 ****
                  } finally {
                      if (tmpURLConnection != null) {
                          Locator.closeConnection(tmpURLConnection);
                      }
                  }
!             } else if (urlConnection instanceof JarURLConnection) {
                  try {
                      closeConnection();
  
                      urlConnection = uri.toURL().openConnection();
  
--- 297,307 ----
                  } finally {
                      if (tmpURLConnection != null) {
                          Locator.closeConnection(tmpURLConnection);
                      }
                  }
!             } else if ((urlConnection instanceof JarURLConnection) || isJRT()) {
                  try {
                      closeConnection();
  
                      urlConnection = uri.toURL().openConnection();
  
*** 333,342 ****
--- 335,349 ----
          private ReadableByteChannel openChannel(InputStream inputStream) throws IOException {
              return (inputStream == null) ?
                      Channels.newChannel(urlConnection.getInputStream()) :
                      Channels.newChannel(inputStream);
          }
+ 
+         private boolean isJRT() {
+             String scheme = uri.getScheme().toLowerCase();
+             return "jrt".equals(scheme);
+         }
      }
  
      // A "ConnectionHolder" that "reads" from a ByteBuffer, generally loaded from
      // some unsupported or buggy source
      private static class MemoryConnectionHolder extends ConnectionHolder {