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https://issues.apache.org/jira/browse/PDFBOX-3760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973385#comment-15973385
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Tilman Hausherr commented on PDFBOX-3760:
-----------------------------------------
Yes it is swallowed... users want it like that. But in your case, it is clearly
a configuration error. It's described in the dependency page. And although it
doesn't throw an exception, it puts an ERROR in the logfile.
Re "include the jbig2-imageio dependency with PDFBox" we can't because of an
incompatible license.
> PDFStreamEngine swallows errors and should throw exceptions when pdf cannot
> be read
> -----------------------------------------------------------------------------------
>
> Key: PDFBOX-3760
> URL: https://issues.apache.org/jira/browse/PDFBOX-3760
> Project: PDFBox
> Issue Type: Improvement
> Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5
> Reporter: Steven McDermott
> Priority: Minor
>
> The PDFStreamEngine class has the method below. Trying to convert a PDF
> without the jbig2-imageio dependency installed, the following error message
> shows in the logs:
> {code}
> Cannot read JBIG2 image: jbig2-imageio is not installed
> {code}
> This message shows in the logs and no error is thrown back to the
> implementing class. Therefore actual errors are not communicated to the
> client attempting to convert a PDF. This should throw an error and print the
> stack trace to the console so that debugging can occur quickly and resolution
> to misconfiguration can be made.
> Another alternative option is to include the jbig2-imageio dependency with
> PDFBox so that this exception would never occur.
> Method for reference:
> {code}
> protected void operatorException(Operator operator, List<COSBase> operands,
> IOException e)
> throws IOException
> {
> if (e instanceof MissingOperandException ||
> e instanceof MissingResourceException ||
> e instanceof MissingImageReaderException)
> {
> LOG.error(e.getMessage());
> }
> else if (e instanceof EmptyGraphicsStackException)
> {
> LOG.warn(e.getMessage());
> }
> else if (operator.getName().equals("Do"))
> {
> // todo: this too forgiving, but PDFBox has always worked this
> way for DrawObject
> // some careful refactoring is needed
> LOG.warn(e.getMessage());
> }
> else
> {
> throw e;
> }
> }{code}
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