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From Iain Soedring <IAINS...@uk.ibm.com>
Subject Re: FOP failing to transform XSL to PDF with image when run in tomcat/osgi, but working when run in standalone
Date Wed, 26 Nov 2014 16:23:22 GMT
Thanks Matt, Terence,

This leads me to suspect the problem is with OSGI, I'm currently 
repackaging the FOP jars as an OSGI bundle (it's not on springsource 
unfortunately).  I will update this thread if that resolves it.

Regards,

Iain





From:   Matt Kynaston <matt@claritum.com>
To:     fop-users@xmlgraphics.apache.org
Date:   24/11/2014 22:18
Subject:        Re: FOP failing to transform XSL to PDF with image when 
run in tomcat/osgi, but working when run in standalone



Yeah, ditto that. Mind you, we're also using fop-pdf-images.

I'd review what jars are actually being loaded - this sounds like a 
mismatch somewhere. 

Ah, java. Run once, run... once.

Matt


On 24 November 2014 at 20:54, Terence M. Bandoian <terence@tmbsw.com> 
wrote:
Hi, Iain-

This may not help much but I've been able to successfully use 
fo:external-graphic in FOP 1.0 on Tomcat 6 and Tomcat 7.  The images were 
JPEG and OSGI was not used.

-Terence Bandoian



On 11/24/2014 9:53 AM, Iain Soedring wrote:
Hi,

I have an xsl file that includes an external image:

<fo:external-graphic src="/images/BrandGraphic.PNG"/>

When running as a standalone Java application the transformer.transform 
function works, and I get a valid PDF file.

When running in Tomcat/OSGI, on the same server (same JRE), I get the 
following error:

FATAL ERROR:  'java.lang.IllegalArgumentException: Unknown function: 
gatherContextInfo'
           :Unknown function: gatherContextInfo

If I remove the image from the XSL, everything works.

I checked in the fop 1.0 source, and see that this comes from

org.apache.fop.util.text.AdvancedMessageFormat

        public FunctionPart(String functionName) {
this.function = getFunction(functionName);
if (this.function == null) {
    throw new IllegalArgumentException("Unknown function: " + 
functionName);
}
        }

Unfortunately no stack trace is output when catching this exception, and 
tracing back through the code I can see various places from where this 
could have got called.

the 'gatherContextInfo' function itself is in 
org.apache.fop.fo.FONode.java, and is overridden in sub-classes.

On the class-loading side, I've verified that the same jars are loaded in 
both tomcat and standalone.  The following are the ones that I find are 
essential for my transform to work:

avalon, batik, commons-io, commons-logging, xmlgraphics.

On tomcat there are many more libraries loaded, but the only overlap I can 
see is commons-logging, where my war file already uses a different version 
of this.

I have asked the same question on stackoverflow: 
https://stackoverflow.com/questions/27066409/apachefop-tomcat-osgi-error-java-lang-illegalargumentexception-unknown-functio
, but I haven't get much response beyond what I'd already looked at so 
far.

One other issue I found running FOP in Tomcat/OSGI, was the need to 
override the PDF renderer, with this code:

      FOUserAgent useragent = fopFactory.newFOUserAgent();
      PDFRenderer pdfrenderer = new PDFRenderer();
      pdfrenderer.setUserAgent(useragent);
      useragent.setRendererOverride(pdfrenderer);

      fopFactory.addElementMapping(new FOElementMapping());
...
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, useragent, out);

otherwise the code would fail with:

 Caused by: java.lang.UnsupportedOperationException: Don't know how to 
handle "application/pdf" as an output format. Neither an FOEventHandler, 
nor a Renderer could be found for this output format.
        at 
org.apache.fop.render.RendererFactory.createFOEventHandler(RendererFactory.java:360) 



Does anyone have any idea what could be going wrong here?

Best Regards,

Iain
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU


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Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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