[jira] [Comment Edited] (PDFBOX-3566) ClassCastException in JPEGFactory.createFromImage()

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15657495#comment-15657495 ] 

Tilman Hausherr edited comment on PDFBOX-3566 at 11/11/16 4:50 PM:
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No we won't use {{JPEGImageWriter}} because this would bring a dependency on com.sun.*. There is no mandatory use of that. For example, I use twelvemonkeys.

What we should do is to find a way to avoid that CCE early, e.g. by choosing a plugin that delivers the correct type ({{JPEGImageWriteParam}}) instead of just using the first possible writer. We already do something in ImageIOUtil so I'm optimistic that I can fix this very soon.


was (Author: tilman):
No we won't use "JPEGImageWriter" because this would bring a dependency on com.sun.*. There is no mandatory use of that. For example, I use twelvemonkeys.

What we should do is to find a way to avoid that CCE early, e.g. by getting a plugin that delivers the correct type instead of just using the first possible writer. We already do something in ImageIOUtil so I'm optimistic that this will be fixed very soon.

> ClassCastException in JPEGFactory.createFromImage()
> ---------------------------------------------------
>
>                 Key: PDFBOX-3566
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3566
>             Project: PDFBox
>          Issue Type: Bug
>    Affects Versions: 2.0.3
>         Environment: Linux OS, Java 1.8, Oracle Java Advanced Imaging (JAI) installed.
>            Reporter: ceakki
>
> I was trying to save all the pages from a PDF as images and adding them to a newly created PDF.
> {code}
> PDDocument newDoc = new PDDocument();
> PDFRenderer pdfRenderer = new PDFRenderer(oldDoc);
> floag width = ...
> float height = ...
> page.setMediaBox(new PDRectangle(width, height));
> newDoc.addPage(page);
> PDPageContentStream contents = new PDPageContentStream(newDoc, page);
> BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(0, 200, ImageType.RGB);
> PDImageXObject imageXObject = JPEGFactory.createFromImage(newDoc, bufferedImage, 0.75);
> contents.drawImage(imageXObject, 0, 0, width, height);
> contents.close();
> ...
> {code}
> Sometimes it's working just fine, sometimes it's trowing a ClassCastException in JPEGFactory.createFromImage:
> {noformat}
> java.lang.ClassCastException: com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageWriteParam cannot be cast to javax.imageio.plugins.jpeg.JPEGImageWriteParam
> 	at org.apache.pdfbox.pdmodel.graphics.image.JPEGFactory.encodeImageToJPEGStream(JPEGFactory.java:244)
> 	at org.apache.pdfbox.pdmodel.graphics.image.JPEGFactory.createJPEG(JPEGFactory.java:212)
> 	at org.apache.pdfbox.pdmodel.graphics.image.JPEGFactory.createFromImage(JPEGFactory.java:175)
> 	at org.apache.pdfbox.pdmodel.graphics.image.JPEGFactory.createFromImage(JPEGFactory.java:160)
> 	at com.mimecast.ttpservice.app.jpati.ConvertPDF.saveDoc(ConvertPDF.java:1390)
> {noformat}
> This is happening in the following code of above mentioned class:
> {code}
> imageWriter = ImageIO.getImageWritersBySuffix("jpeg").next();
> ...
> JPEGImageWriteParam jpegParam = (JPEGImageWriteParam)imageWriter.getDefaultWriteParam();
> {code}
> In my case I can get more than one ImageWritter when calling *ImageIO.getImageWritersBySuffix("jpeg")* as follows:
> {noformat}
> com.sun.imageio.plugins.jpeg.JPEGImageWriter
> com.sun.media.imageioimpl.plugins.jpeg.CLibJPEGImageWriter
> {noformat}
> I suspect that sometimes the *CLibJPEGImageWriter* is returned before *JPEGImageWriter*, which produces the ClassCastException a bit later.
> As I need to keep the JAI installed, is it possible to change the above code to loop through all ImageWriters found in order to pick the one needed by PdfBox?
> I would recommend doing something like this: 
> {code}
> Iterator<ImageWriter> iterator = ImageIO.getImageWritersBySuffix("jpeg");
> while (iterator.hasNext()) {
>     ImageWriter foundWriter = iterator.next();
>     if (foundWriter instanceof JPEGImageWriter) {
>         imageWriter = foundWriter;
>         break;
>     }
> }
> if (imageWriter == null) {
>     throw new InvalidStateException("No image writer found of JPEGImageWriter type");
> }
> {code}



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