Martin Honnen created XALANJ-2799:
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Summary: java.lang.ClassCastException:
org.apache.xpath.objects.XString cannot be cast to java.lang.String when using
XSLT key function on the right side of step operator /
Key: XALANJ-2799
URL: https://issues.apache.org/jira/browse/XALANJ-2799
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: Java 8, Windows 11
Reporter: Martin Honnen
Attachments: cars.xml, key-fn-call-in-last-step-test1.xsl
Working with the latest XSLT 3.0 branch of Apache Xalan, I get an exception
`java.lang.ClassCastException: org.apache.xpath.objects.XString cannot be cast
to java.lang.String` when trying to use the XSLT `key` function on the right
side of the "path" operator `/` e.g. `key('car-by-color', 'red') /
key('lot-for-car', @vin)`.
I would expect the right side of the / to be evaluated for each node selected
by the expression on the left side of /, without giving any errors. This is an
established XPath 2 and XSLT 2 coding pattern.
The full code
{code:xml}
<?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:output method="xml" indent="yes"/>
<xsl:key name="car-by-color" match="cars/car" use="@color"/>
<xsl:key name="lot-for-car" match="lot" use="car/@vin"/>
<xsl:template match="lot">
<lot id="{@id}"/>
</xsl:template>
<xsl:template match="/">
<set>
<problem>
<question>Which lots have red cars?</question>
<answer>
<xsl:apply-templates select="key('car-by-color', 'red') /
key('lot-for-car', @vin)"/>
</answer>
</problem>
</set>
</xsl:template>
</xsl:stylesheet>
{code}
Sample XML input is e.g.
{code:xml}
<dir>
<cars>
<car vin="101" color="red"/>
<car vin="102" color="green"/>
<car vin="103" color="red"/>
<car vin="104" color="red"/>
</cars>
<lots>
<lot id="L">
<car vin="101"/>
<car vin="103"/>
</lot>
<lot id="M">
<car vin="102"/>
</lot>
<lot id="N">
<car vin="104"/>
</lot>
</lots>
</dir>
{code}
Full error output:
{code}
(Position des Fehlers unbekannt)java.lang.ClassCastException:
org.apache.xpath.objects.XString cannot be cast to java.lang.String
(Position des Fehlers unbekannt)XSLT-Fehler
(javax.xml.transform.TransformerException): Keine Verarbeitungsanweisung f³r
xml-stylesheet gefunden in
..\..\OneDrive\Documents\xslt\blog-xslt-3-by-example\xalan-xslt3-tests\cars.xml.
Exception in thread "main" java.lang.RuntimeException: Keine
Verarbeitungsanweisung für xml-stylesheet gefunden in
..\..\OneDrive\Documents\xslt\blog-xslt-3-by-example\xalan-xslt3-tests\cars.xml.
at org.apache.xalan.xslt.Process.doExit(Process.java:1176)
at org.apache.xalan.xslt.Process.main(Process.java:1149)
{code}
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