Getting java.lang.UnsupportedOperationException at org.apache.pdfbox.pdmodel.graphics.color.PDPattern.toRGB

[aino-vedang]

I am using Pdf2Dom to parse pdf document. In my java application when I tried to convert a PDF file to html. I am getting,

java.lang.UnsupportedOperationException
at org.apache.pdfbox.pdmodel.graphics.color.PDPattern.toRGB(PDPattern.java:95)
at org.fit.pdfdom.PathDrawer.pdfColorToColor(PathDrawer.java:133)
at org.fit.pdfdom.PathDrawer.clearPathGraphics(PathDrawer.java:79)
at org.fit.pdfdom.PathDrawer.drawPath(PathDrawer.java:59)
at org.fit.pdfdom.PDFDomTree.createPathImage(PDFDomTree.java:403)
at org.fit.pdfdom.PDFDomTree.renderPath(PDFDomTree.java:251)
at org.fit.pdfdom.PDFBoxTree.processOperator(PDFBoxTree.java:499)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:503)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:477)
at org.apache.pdfbox.contentstream.PDFStreamEngine.showForm(PDFStreamEngine.java:181)
at org.apache.pdfbox.contentstream.operator.DrawObject.process(DrawObject.java:65)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:848)
at org.fit.pdfdom.PDFBoxTree.processOperator(PDFBoxTree.java:542)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:503)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:477)
at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150)
at org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:139)
at org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:391)
at org.fit.pdfdom.PDFBoxTree.processPage(PDFBoxTree.java:208)
at org.apache.pdfbox.text.PDFTextStripper.processPages(PDFTextStripper.java:319)
at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:266)
at org.fit.pdfdom.PDFDomTree.createDOM(PDFDomTree.java:218)
at com.demo.pdf.converter.PdfProcessor.convertToHtml(PdfProcessor.java:87)

[THausherr]

I suspect this is a bug in PDF2Dom, a pattern in a PDF can't be converted to an RGB color. (Think about it - e.g. a dots pattern isn't one RGB color, it is a vector graphics instruction).

To see how patterns are treated in PDFBox, see PageDrawer.getPaint().

More files with patterns can be found here:
https://issues.apache.org/jira/browse/PDFBOX-1094

[aino-gautam]

@aino-vedang pdf2dom internally uses pdfbox and not the other way around as you mentioned. Did you find a solution yet ?

And seems @THausherr is correct in his quote that the issue lies in pdf2dom.

[aino-vedang]

@aino-gautam I realised that issue is in pdf2dom library and just now I have updated the question. But I haven't found solution for it yet.