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https://issues.apache.org/jira/browse/XALANJ-2799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17936222#comment-17936222
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Mukul Gandhi commented on XALANJ-2799:
--------------------------------------
[~martin.honnen]
It'll be helpful I think, if we have an XML Schema document for an XML input
document that you've shared within this bug report.
I'm personally not a great expert on understanding in detail the XSLT 3.0 spec
for xsl:key instruction and key(..) function. I think, this is quite different
(although, similar in intent) than the corresponding definitions provided by
XSLT 1.0 and XPath 1.0 specs. I've worked earlier using XSL 1 xsl:key
instruction and key(..) function.
Hoping to find time to write a better fix for this bug report.
> 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
> Priority: Major
> 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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