[FOP-1549] Marker example (hide.fo) throws Null Pointer Exception for forward references

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 0.94
• Component/s: unqualified
• Environment: Operating System: Windows XP; Platform: PC
• External issue ID: 45295
• Assignee: fop-dev
• Reporter: Jamie Browning
• Created: 27/Jun/08 02:34
• Updated: 27/Jun/08 02:35
• Resolved: 01/Apr/12 06:40

Description

In 0.94 and 0.95 beta the Marker example (hide.fo) throws the following Exception.

C:\Program Files\fop-0.94\examples\fo>ant runtest
Buildfile: build.xml

init:

newPDF:

newTestFiles:
[fop] C:\Program Files\fop-0.94\examples\fo\markers\hide.fo -> C:\Program
Files\fop-0.94\examples\fo\tests\hide.pdf
[fop] 27-Jun-2008 09:59:38 org.apache.fop.cli.InputHandler error
[fop] SEVERE: javax.xml.transform.TransformerException:

BUILD FAILED
C:\Program Files\fop-0.94\examples\fo\build.xml:82: The following error occurred
while executing this line:
C:\Program Files\fop-0.94\examples\fo\build.xml:48: javax.xml.transform.Transfor
merException: java.lang.NullPointerException:

Total time: 2 seconds

I have attached a sample file which more closely matches the use case that I discovered this issue from. This works fine in 0.25 but is broken in 0.94/0.95beta.

The stack trace from running this example on 0.94 is slightly more useful than the one from the example:

H:\My Documents\Catlin\IT\Development\FO Processor\run_fo>"C:\Program Files\fop-
0.94\fop.bat" -fo infile.fo -pdf outfile.pdf
27-Jun-2008 10:32:53 org.apache.fop.cli.Main startFOP
SEVERE: Exception
java.lang.NullPointerException:
at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:168)
at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:115)
at org.apache.fop.cli.Main.startFOP(Main.java:166)
at org.apache.fop.cli.Main.main(Main.java:197)

---------

java.lang.NullPointerException:
at org.apache.fop.fo.flow.PageNumberCitation.startOfNode(PageNumberCitat
ion.java:115)
at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuil
der.java:329)
at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:185)
at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(Tra
nsformerIdentityImpl.java:1072)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Sour
ce)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unkn
own Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unkn
own Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xalan.transformer.TransformerIdentityImpl.transform(Transf
ormerIdentityImpl.java:484)
at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:165)
at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:115)
at org.apache.fop.cli.Main.startFOP(Main.java:166)
at org.apache.fop.cli.Main.main(Main.java:197)