PDF images - IllegalStateException - Error registering a PDFObject: PDFObject already has an object number

[Peter Coppens]

Fop fans,

Somewhere deep in Œmy¹ web application when rendering a constructed fo I get

SEVERE: Exception stack tracejava.lang.IllegalStateException: Error
registering a PDFObject: PDFObject already has an object number
        at 
org.apache.fop.pdf.PDFDocument.assignObjectNumber(PDFDocument.java:429)
        at 
org.apache.fop.pdf.PDFDocument.registerObject(PDFDocument.java:414)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.cloneForNewDocument(PDFBoxAda
pter.java:100)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.transferDict(PDFBoxAdapter.ja
va:169)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.cloneForNewDocument(PDFBoxAda
pter.java:133)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.cloneForNewDocument(PDFBoxAda
pter.java:99)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.cloneForNewDocument(PDFBoxAda
pter.java:142)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.cloneForNewDocument(PDFBoxAda
pter.java:142)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxAdapter.createFormFromPDFBoxPage(PDFB
oxAdapter.java:182)
        at 
org.apache.fop.render.pdf.pdfbox.PDFBoxPDFImageHandler.generateImage(PDFBoxP
DFImageHandler.java:93)
        at 
org.apache.fop.render.pdf.PDFRenderer.putImage(PDFRenderer.java:1745)
        at 
org.apache.fop.render.pdf.PDFRenderer.renderImage(PDFRenderer.java:1679)
        at 
org.apache.fop.render.AbstractRenderer.renderViewport(AbstractRenderer.java:
734)
        at 
org.apache.fop.render.AbstractPathOrientedRenderer.renderViewport(AbstractPa
thOrientedRenderer.java:557)
        at 
org.apache.fop.render.AbstractRenderer.renderInlineArea(AbstractRenderer.jav
a:617)
        at 
org.apache.fop.render.pdf.PDFRenderer.renderInlineArea(PDFRenderer.java:1345
)
        at 
org.apache.fop.render.AbstractRenderer.renderLineArea(AbstractRenderer.java:
592)
        at 
org.apache.fop.render.pdf.PDFRenderer.renderLineArea(PDFRenderer.java:1336)
        at 
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:52
9)
        at 
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:564
)
        at 
org.apache.fop.render.pdf.PDFRenderer.renderBlock(PDFRenderer.java:1329)
        at 
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:51
9)
        at 
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:564
)
        at 
org.apache.fop.render.pdf.PDFRenderer.renderBlock(PDFRenderer.java:1329)
        at 
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:51
9)
        at 
org.apache.fop.render.AbstractPathOrientedRenderer.renderBlockViewport(Abstr
actPathOrientedRenderer.java:478)

...

I was wondering whether someone can diagnose this without me having to try
and extract a repro.

Thanks indeed!

Peter