xpath expression containing attribute test followed by or and the preceding
axis causes stack overflow.
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Key: XALANJ-2347
URL: http://issues.apache.org/jira/browse/XALANJ-2347
Project: XalanJ2
Issue Type: Bug
Components: Xalan
Affects Versions: 2.7
Environment: Win XP, Xalan Java 2.7.0, java.version=1.5.0_06
Reporter: Robert Eaton
Priority: Minor
I have been getting a StackOverflowError when trying to perform an XSL
transformation using Xalan 2.7.0 with a styleshhet I had written. I have
simplified the the XSL and the problem seems to be related to an xpath
expression used in an if, but I can't see anything wrong with it.
I was using this xml:
<?xml version="1.0" encoding="UTF-8"?>
<docdef>
<region name="Main Region">
<section id="2" name="section1">
<frag id="1" name="part1" type="text">
<p style="body" align="left" xml:space="preserve">first paragraph.</p>
</frag>
<frag id="2" name="next fragment" type="text">
<p style="inherit" align="center" xml:space="preserve">Paragraph with a style
of inherit but its own alignment , first in fragment.</p>
<p style="inherit" xml:space="preserve"/>
<p xml:space="preserve">Another paragraph</p>
</frag>
</section>
</region>
</docdef>
with this xsl:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:fo="http://www.w3.org/1999/XSL/Format";
xmlns:w="http://schemas.microsoft.com/office/word/2003/wordml";
xmlns:aml="http://schemas.microsoft.com/aml/2001/core";
xmlns:w10="urn:schemas-microsoft-com:office:word"
xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:wx="http://schemas.microsoft.com/office/word/2003/auxHint";
xmlns:o="urn:schemas-microsoft-com:office:office" >
<xsl:template match="[EMAIL PROTECTED]'inherit']">
<xsl:if test="not(preceding-sibling::*) or preceding-sibling::*[1] !=
preceding-sibling::p[1]">
<w:p>
<w:pPr>
<!-- This is the problem statement. The error does not occur if the '@align
or' is removed from the start of the xpath.-->
<xsl:if test="@align or
preceding::p[not(ancestor::table)][not(@style='inherit')][1]/@align">
<xsl:element name="w:jc">
<xsl:if test="@align">
<xsl:attribute name="w:val"><xsl:value-of select="@align"/></xsl:attribute>
</xsl:if>
<xsl:if test="not(@align)">
<xsl:attribute name="w:val">
<xsl:value-of
select="preceding::p[not(ancestor::table)][not(@style='inherit')][1]/@align"/>
</xsl:attribute>
</xsl:if>
</xsl:element>
</xsl:if>
</w:pPr>
<xsl:apply-templates/>
</w:p>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
The error message I get from Xalan is
(Location of error unknown)XSLT Error (java.lang.StackOverflowError): null
Exception in thread "main" java.lang.RuntimeException
at org.apache.xalan.xslt.Process.doExit(Process.java:1153)
at org.apache.xalan.xslt.Process.main(Process.java:1126)
If I do the transformation within XMLSpy it does not report any errors so it
seems to be something to do with Xalan.
I have tried enabling various tracing options, see output below, but I get no
additional output.
C:\xalan\xalan-j_2_7_0>java -Xmx128M -cp c:\xalan\xalan-j_2_7_0\xalan.jar;c:\xal
an\xalan-j_2_7_0\xml-apis.jar;c:\xalan\xalan-j_2_7_0\xercesImpl.jar org.apache.x
alan.xslt.Process -TT -in test.xml -xsl test.xsl -out out.xml
(Location of error unknown)XSLT Error (java.lang.StackOverflowError): null
Exception in thread "main" java.lang.RuntimeException
at org.apache.xalan.xslt.Process.doExit(Process.java:1153)
at org.apache.xalan.xslt.Process.main(Process.java:1126)
I also tried -TG, -TS and -TTC and all give the same result as above.
The results of running environement check are shown below.
#---- BEGIN writeEnvironmentReport($Revision: 1.29 $): Useful stuff found: ----
version.DOM.draftlevel=2.0fd
java.class.path=c:\xalan\xalan-j_2_7_0\xalan.jar;c:\xalan\xalan-j_2_7_0\xml-apis.jar;c:\xalan\xalan-j_2_7_0\xercesImpl.jar
version.JAXP=1.1 or higher
java.ext.dirs=C:\Program Files\Java\jre1.5.0_06\lib\ext
version.xerces2=Xerces-J 2.7.1
version.xerces1=not-present
version.xalan2_2=Xalan Java 2.7.0
version.xalan1=not-present
version.ant=not-present
java.version=1.5.0_06
version.DOM=2.0
version.crimson=not-present
sun.boot.class.path=C:\Program Files\Java\jre1.5.0_06\lib\rt.jar;C:\Program
Files\Java\jre1.5.0_06\lib\i18n.jar;C:\Program
Files\Java\jre1.5.0_06\lib\sunrsasign.jar;C:\Program
Files\Java\jre1.5.0_06\lib\jsse.jar;C:\Program
Files\Java\jre1.5.0_06\lib\jce.jar;C:\Program
Files\Java\jre1.5.0_06\lib\charsets.jar;C:\Program
Files\Java\jre1.5.0_06\classes
#---- BEGIN Listing XML-related jars in: foundclasses.java.class.path ----
xalan.jar-path=c:\xalan\xalan-j_2_7_0\xalan.jar
xml-apis.jar-apparent.version=xml-apis.jar from head branch of xml-commons,
tag: xml-commons-external_1_3_02
xml-apis.jar-path=c:\xalan\xalan-j_2_7_0\xml-apis.jar
xercesImpl.jar-apparent.version=xercesImpl.jar from Xerces-J-bin.2.7.1
xercesImpl.jar-path=c:\xalan\xalan-j_2_7_0\xercesImpl.jar
#----- END Listing XML-related jars in: foundclasses.java.class.path -----
version.SAX=2.0
version.xalan2x=Xalan Java 2.7.0
#----- END writeEnvironmentReport: Useful properties found: -----
# YAHOO! Your environment seems to be OK.
I have also managed to get the error with a different but similar Xpath
expression. It seems to be a problem when it starts with "@align or preceding"
an attribute test followed by the ancestor axis does not seem to cause a
problem and if I remove the '@align or' from the begining and break it up into
multiple xsl:if statements it is okay.
I believe it is happening when the stylesheet it first passed before it
actually starts the transformation.
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