src/share/classes/com/sun/imageio/plugins/jpeg/JPEGImageWriter.java

*** 316,326 ****
      public Dimension[] getPreferredThumbnailSizes(ImageTypeSpecifier imageType,
                                                    ImageWriteParam param,
                                                    IIOMetadata streamMetadata,
                                                    IIOMetadata imageMetadata) {
          if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
!             return (Dimension [])preferredThumbSizes.clone();
          }
          return null;
      }
  
      private boolean jfifOK(ImageTypeSpecifier imageType,
--- 316,326 ----
      public Dimension[] getPreferredThumbnailSizes(ImageTypeSpecifier imageType,
                                                    ImageWriteParam param,
                                                    IIOMetadata streamMetadata,
                                                    IIOMetadata imageMetadata) {
          if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
!             return preferredThumbSizes.clone();
          }
          return null;
      }
  
      private boolean jfifOK(ImageTypeSpecifier imageType,