[ 
https://issues.apache.org/jira/browse/XALANJ-2782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mukul Gandhi reassigned XALANJ-2782:
------------------------------------

    Assignee: Mukul Gandhi

> 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
>            Assignee: Mukul Gandhi
>            Priority: Major
>         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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