Bug 8698 - NullPointerException when trying to render FO file
Summary: NullPointerException when trying to render FO file
Status: CLOSED DUPLICATE of bug 6243
Alias: None
Product: Fop - Now in Jira
Classification: Unclassified
Component: general (show other bugs)
Version: 0.20.3
Hardware: All All
: P3 normal
Target Milestone: ---
Assignee: fop-dev
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2002-05-01 15:15 UTC by Mikael St
Modified: 2012-04-01 13:53 UTC (History)
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Description Mikael St 2002-05-01 15:15:52 UTC 
When I try to render the attached FO file, I get this exception

[INFO]: FOP 0.20.3
[DEBUG]: using SAX parser org.apache.xerces.parsers.SAXParser
[INFO]: building formatting object tree
[DEBUG]: setting up fonts
[ERROR]: null
org.apache.fop.apps.FOPException
        at org.apache.fop.apps.Driver.render(Driver.java:486)
        at org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:72
)
        at org.apache.fop.apps.Fop.main(Fop.java:19)

---------

java.lang.NullPointerException
        at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:965)
        at org.apache.fop.apps.Driver.render(Driver.java:481)
        at org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:72
)
        at org.apache.fop.apps.Fop.main(Fop.java:19)

---------

java.lang.NullPointerException
        at org.apache.fop.fo.flow.Flow.setFlowName(Flow.java:98)
        at org.apache.fop.fo.flow.Flow.<init>(Flow.java:77)
        at org.apache.fop.fo.flow.Flow$Maker.make(Flow.java:28)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:261)
        at org.apache.xerces.parsers.SAXParser.startElement(SAXParser.java:1371)

        at org.apache.xerces.validators.common.XMLValidator.callStartElement(XML
Validator.java:840)
        at org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.disp
atch(XMLDocumentScanner.java:1223)
        at org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentS
canner.java:381)
        at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:948)
        at org.apache.fop.apps.Driver.render(Driver.java:481)
        at org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:72
)
        at org.apache.fop.apps.Fop.main(Fop.java:19)

---------

java.lang.NullPointerException
        at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:965)
        at org.apache.fop.apps.Driver.render(Driver.java:481)
        at org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:72
)
        at org.apache.fop.apps.Fop.main(Fop.java:19)

---------

java.lang.NullPointerException
        at org.apache.fop.fo.flow.Flow.setFlowName(Flow.java:98)
        at org.apache.fop.fo.flow.Flow.<init>(Flow.java:77)
        at org.apache.fop.fo.flow.Flow$Maker.make(Flow.java:28)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:261)
        at org.apache.xerces.parsers.SAXParser.startElement(SAXParser.java:1371)

        at org.apache.xerces.validators.common.XMLValidator.callStartElement(XML
Validator.java:840)
        at org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.disp
atch(XMLDocumentScanner.java:1223)
        at org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentS
canner.java:381)
        at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:948)
        at org.apache.fop.apps.Driver.render(Driver.java:481)
        at org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:72
)
        at org.apache.fop.apps.Fop.main(Fop.java:19)



<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format"><fo:layout-master-
set><fo:simple-page-master margin-bottom="2cm" margin-top="2cm" margin-
right="3cm" margin-left="3cm"><fo:region-before extent="12pt"/><fo:region-body 
margin-bottom="20pt" margin-top="20pt"/><fo:region-after 
extent="12pt"/></fo:simple-page-master></fo:layout-master-set><fo:page-
sequence><fo:flow><fo:block space-after="6pt" text-align="centered" font-
size="24pt">Master's thesis</fo:block><fo:block text-align="centered">
            by Mikael St&#9500;Ñldal</fo:block></fo:flow></fo:page-sequence><fo:page-
sequence><fo:sequence-specification><fo:sequence-specifier-repeating page-
master-repeating="one" page-master-first="one"/></fo:sequence-
specification><fo:static-content flow-name="xsl-before"><fo:block font-
size="10pt">Master's thesis</fo:block></fo:static-content><fo:static-content 
flow-name="xsl-after"><fo:block text-align="centered" font-size="10pt"><fo:page-
number/></fo:block></fo:static-content><fo:flow font-family="serif" font-
size="12pt"><fo:block space-after="24pt" font-size="20pt">Table of Contents
        </fo:block><fo:block>
            Chapter 1 -
            XML and related standards...
            <fo:page-number-citation ref-id="chap1"/></fo:block><fo:list-
block><fo:list-item><fo:list-item-label><fo:block/></fo:list-item-
label><fo:list-item-body><fo:block>1.1 Extensible Stylesheet Language...
                <fo:page-number-citation ref-id="sect1.1"/></fo:block></fo:list-
item-body></fo:list-item><fo:list-item><fo:list-item-label><fo:block/></fo:list-
item-label><fo:list-item-body><fo:list-block><fo:list-item><fo:list-item-
label><fo:block/></fo:list-item-label><fo:list-item-body><fo:block>1.1.1 XSL 
Transformations...
                    <fo:page-number-citation ref-
id="subsect1.1.1"/></fo:block></fo:list-item-body></fo:list-item><fo:list-
item><fo:list-item-label><fo:block/></fo:list-item-label><fo:list-item-
body><fo:block>1.1.2 Formatting Objects...
                    <fo:page-number-citation ref-
id="subsect1.1.2"/></fo:block></fo:list-item-body></fo:list-item></fo:list-
block></fo:list-item-body></fo:list-item></fo:list-block>
<fo:block id="chap1" font-size="20pt" break-before="page">
        Chapter 1</fo:block><fo:block space-after="24pt" font-size="20pt">XML 
and related standards</fo:block>


<fo:block id="sect1.1" font-weight="bold" font-size="14pt">1.1 Extensible 
Stylesheet Language</fo:block>


<fo:block id="subsect1.1.1" font-weight="bold">1.1.1 XSL 
Transformations</fo:block>

<fo:block>
XSLT 
    [5]
 is a language for specifying how a class of XML documents
are to be transformed into other documents. The output document can be
another type of XML, HTML <fo:footnote><fo:footnote-citation>1</fo:footnote-
citation><fo:block>1HyperText Markup Language</fo:block></fo:footnote> or plain 
text. XSLT allows the content of the
input document to be filtered, reordered, sorted and duplicated.
Arbitrary static content can be inserted in the output document.
</fo:block>
<fo:block>
Since XSLT usually is used for formatting and presenting XML documents, a
transformation specification is called a stylesheet. An XSLT stylesheet is
also an XML document.
</fo:block>
<fo:block>
The software module that reads an XSLT stylesheet and applies its
transformation rules on an XML document to produce a transformed document is
called an <fo:inline-sequence font-style="italic">XSLT processor</fo:inline-
sequence>.
</fo:block>


<fo:block id="subsect1.1.2" font-weight="bold">1.1.2 Formatting 
Objects</fo:block>

<fo:block>
Formatting Objects 
    [6]
 (here abbreviated FO) is an XML language used
to describe the formatting and presentation of information on some
medium.
</fo:block>
<fo:block>
Even though FO documents can be stored and transfered as any other XML
documents, they are usually generated by an XSLT transformation and then
directly interpreted to produce the desired presentation.
</fo:block>





<fo:block break-before="page" space-after="24pt" font-size="20pt">
        Bibliography
    </fo:block><fo:list-block>
<fo:list-item><fo:list-item-label id="xmlcomp"><fo:block>[1]
</fo:block></fo:list-item-label><fo:list-item-body><fo:block>Bradley, Niel: 
<fo:inline-sequence font-style="italic">The XML companion, second 
editon</fo:inline-sequence>,
Addison-Wesley 1999.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="xml"><fo:block>[2]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">Extensible Markup Language (XML) 1.0</fo:inline-sequence>,
REC-xml-19980210.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="xmlns"><fo:block>[3]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">Namespaces in XML</fo:inline-sequence>, REC-xml-names-
19990114.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="xpath"><fo:block>[4]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">XML Path Language (XPath) Version 1.0</fo:inline-sequence>, 
REC-xpath-19991116.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="xslt"><fo:block>[5]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">XSL Transformations (XSLT) Version 1.0</fo:inline-sequence>, 
REC-xslt-19991116.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="xsl"><fo:block>[6]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">Extensible Stylesheet Language (XSL) Version 1.0</fo:inline-
sequence>
(working draft), WD-xsl-20000112.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="css1"><fo:block>[7]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">Cascading Style Sheets, level 1</fo:inline-sequence>
REC-CSS1-19990111.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="css2"><fo:block>[8]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">Cascading Style Sheets, level 2</fo:inline-sequence>
REC-CSS2-19980512.</fo:block></fo:list-item-body></fo:list-item>

<fo:list-item><fo:list-item-label id="html"><fo:block>[9]</fo:block></fo:list-
item-label><fo:list-item-body><fo:block>W3C: <fo:inline-sequence font-
style="italic">HTML 4.01 Specification</fo:inline-sequence>,
REC-html401-19991224.</fo:block></fo:list-item-body></fo:list-item>
</fo:list-block>

</fo:flow></fo:page-sequence></fo:root>
Comment 1 J.Pietschmann 2002-05-01 22:14:00 UTC 
That's a rather interesting one. The FO document is invalid, there is
the flow-name missing on the fo:flow, a rare error. While trying
to complain, FOP falls over because there is apparently no logger set
on the flow Java object.
Comment 2 Don Oxley 2002-05-19 16:52:33 UTC 
This appears to be caused by a failure to change the master-name property on 
the fo:conditional-page-master-reference.  Making this correction causes the 
problem to go away.

(This bug was submitted by Bill Cohagan on my behalf - I've confirmed the fix 
with him)

    --Don
Comment 3 J.Pietschmann 2002-10-09 19:38:02 UTC 

*** This bug has been marked as a duplicate of 6243 ***
Comment 4 Glenn Adams 2012-04-01 13:53:26 UTC 
batch transition to closed remaining pre-FOP1.0 resolved bugs