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https://issues.apache.org/jira/browse/XALANC-715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139399#comment-13139399
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Steven J. Hathaway commented on XALANC-715:
-------------------------------------------
Using the CurrentCVS for XalanC and standard XSLT operations,
I do not have problems with NULL pointers when it comes to
processing standard empty nodesets. The reported problem
appears to be localized to the xalan:nodeset() extension function.
Here is my standard validation test using standard XSLT notation.
-------------------------
Standard XSLT without using XPath function "xalan:nodeset(...)" seems to work
OK.
The XML File: foo.xml
<foo/>
The XSL File: foo.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0">
<xsl:template name='EmptyTest'>
<xsl:param name='empty'/>
<xsl:param name='bar'/>
<parm-string parm='empty'><xsl:value-of select='$empty'/></parm-string>
<parm-nodes parm='empty'><xsl:copy-of select='$empty'/></parm-nodes>
<parm-string parm='bar'><xsl:value-of select='$bar'/></parm-string>
<parm-nodes parm='bar'><xsl:copy-of select='$bar'/></parm-nodes>
</xsl:template>
<xsl:template match="/">
<out>
<xsl:call-template name='EmptyTest'>
<xsl:with-param name='bar'><abc>my test line</abc></xsl:with-param>
</xsl:call-template>
</out>
</xsl:template>
</xsl:stylesheet>
The Output File: out.xml -- newlines added for readability
<?xml version="1.0" encoding="UTF-8"?>
<out>
<parm-string parm="empty"/>
<parm-nodes parm="empty"/>
<parm-string parm="bar">my test line</parm-string>
<parm-nodes parm="bar"><abc>my test line</abc></parm-nodes>
</out>
--------------------
> NULL pointer access => crash
> ----------------------------
>
> Key: XALANC-715
> URL: https://issues.apache.org/jira/browse/XALANC-715
> Project: XalanC
> Issue Type: Bug
> Components: XalanC
> Affects Versions: CurrentCVS
> Environment: Any
> Reporter: Michael Kupchuk
> Labels: crash
> Fix For: CurrentCVS
>
> Attachments: crash.xsl, test.xml
>
>
> Using a xalan:nodeset with an empty parameter causes it to return nodeset
> with no data, no parents, completly empty, which in further operations causes
> a NULL pointer access in release or debug assertion in debug.
> Maybe it's not a "very proper" use of xalan:nodeset, but IMHO crash/assertion
> is not the correct behaviour at all.
> Here is an example xslt to reproduce crash:
> <?xml version='1.0' encoding='windows-1251'?>
> <xsl:stylesheet exclude-result-prefixes="xalan" xmlns:xalan =
> "http://xml.apache.org/xalan";
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0">
> <xsl:output method="html" indent="yes" encoding='windows-1251'/>
> <xsl:strip-space elements="*"/>
> <xsl:template name="head-with-info">
> <xsl:param name="head"/>
> <xsl:param name="info"/>
> <xsl:if test="xalan:nodeset($head)/node()">
> <div class="heading"><xsl:copy-of select="$head"/></div>
> </xsl:if>
> <xsl:if test="string-length($info)>0 and xalan:nodeset($info)/node()">
> <div class="group-info"><xsl:copy-of select="$info"/></div>
> </xsl:if>
> </xsl:template>
> <xsl:template match="*" name="test">
> <xsl:value-of select="test_node/inner_test"/>
> <xsl:call-template name="head-with-info">
> <!-- <xsl:with-param name="head"><span>test
> head</span></xsl:with-param> -->
> <xsl:with-param name="info"><span>test info</span></xsl:with-param>
> </xsl:call-template>
> </xsl:template>
> </xsl:stylesheet>
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