Martin Honnen created XALANJ-2782:
-------------------------------------
Summary: NullPointerException in XSLT 3 code
Key: XALANJ-2782
URL: https://issues.apache.org/jira/browse/XALANJ-2782
Project: XalanJ2
Issue Type: Bug
Security Level: No security risk; visible to anyone (Ordinary problems in
Xalan projects. Anybody can view the issue.)
Components: transformation, Xalan, Xalan-CmdLine
Affects Versions: The Latest Development Code
Environment: Windows 11, Adoptium Java 8.422
Reporter: Martin Honnen
Attachments: nullpointer-exception-input-sample1.xml,
nullpointer-exception-sample1.xsl
This is a bug report on the XSLT 3 development branch of Apache Xalan.
When I run the following XSLT code
{code:java}
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="3.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema";
exclude-result-prefixes="xs">
<xsl:template match="data">
<xsl:copy>
<xsl:value-of select="if (normalize-space()) then . else 'default'"/>
</xsl:copy>
</xsl:template>
<xsl:output method="xml" indent="no"/>
<xsl:template match="@* | node()">
<xsl:copy>
<xsl:apply-templates select="@* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="/">
<xsl:copy>
<xsl:apply-templates/>
<xsl:comment>Run with <xsl:value-of
select="system-property('xsl:vendor')"/> at <xsl:value-of
select="current-dateTime()"/></xsl:comment>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
{code}
against the XML input
{code:java}
<root>
<item>
<data>foo</data>
</item>
<item>
<data></data>
</item>
</root>{code}
(from the command line with e.g.
{noformat}
& 'C:\Program Files\Eclipse Adoptium\jdk-8.0.422.5-hotspot\bin\java.exe' -cp
'build\xalan.jar;build\serializer.jar;lib\bcel-6.7.0.jar;lib\brazil-2.1.jar;lib\bsf.jar;lib\commons-logging-1.2.jar;lib\javaee-api-5.0-2.jar;lib\javaee-api-5.0-2.jar;lib\regexp.jar;lib\rhino-1.7.14.jar;lib\runtime.jar;lib\servlet-api-2.5.jar;lib\xpath31_types.jar;lib\endorsed\xercesImpl.jar;lib\endorsed\xml-apis.jar'
org.apache.xalan.xslt.Process -in
..\..\OneDrive\Documents\xslt\blog-xslt-3-by-example\xalan-xslt3-tests\nullpointer-exception-input-sample1.xml
-xsl
..\..\OneDrive\Documents\xslt\blog-xslt-3-by-example\xalan-xslt3-tests\nullpointer-exception-sample1.xsl
{noformat}
)
I get an error (NullPointerException)
{noformat}
file:///C:/Users/marti/IdeaProjects/xalan-java/../../OneDrive/Documents/xslt/blog-xslt-3-by-example/xalan-xslt3-tests/nullpointer-exception-sample1.xsl;
Zeilennummer22; Spaltennummer15; java.lang.NullPointerException{noformat}
The code runs fine with Saxon HE 12 as shown above or even with Xalan with no
change to that line 22 but a rewrite and avoidance of the `if` expression by
using a match pattern e.g.
{code:java}
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="3.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema";
exclude-result-prefixes="xs">
<xsl:template match="data[not(normalize-space())]">
<xsl:copy>default</xsl:copy>
</xsl:template>
<xsl:output method="xml" indent="no"/>
<xsl:template match="@* | node()">
<xsl:copy>
<xsl:apply-templates select="@* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="/">
<xsl:copy>
<xsl:apply-templates/>
<xsl:comment>Run with <xsl:value-of
select="system-property('xsl:vendor')"/> at <xsl:value-of
select="current-dateTime()"/></xsl:comment>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
{code}
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