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https://issues.apache.org/jira/browse/XALANJ-2801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17937217#comment-17937217
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Joshua Marquart commented on XALANJ-2801:
-----------------------------------------
See if XALANJ-2792 and XALANJ-2973 patches help.
> java.lang.StackOverflowError with XPath step doing /.
> -----------------------------------------------------
>
> Key: XALANJ-2801
> URL: https://issues.apache.org/jira/browse/XALANJ-2801
> 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
>
> This is a bug report on the XSLT 3 development branch of Xalan.
> In XPath 2 and later, where you work with sequence that can contain
> duplicates of nodes, a common technique to achieve de-duplication is to
> append a step doing
> {noformat}
> /.
> {noformat}
> .
> An attempt to run a test case for Xalan whether it supports that results in a
> StackOverflowError.
> Here is the code, first the XML:
> {code:xml}
> <root>
> <foo>foo 1</foo>
> <foo>foo 2</foo>
> <foo>foo 3</foo>
> </root>
> {code}
> then the XSLT:
> {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:template match="/*">
> <xsl:copy>
> <children>
> <xsl:sequence select="*"/>
> </children>
> <sequence-of-some-children>
> <xsl:sequence select="(foo, foo)"/>
> </sequence-of-some-children>
> <de-duplicated-sequence-of-some-children>
> <xsl:sequence select="(foo, foo)/."/>
> </de-duplicated-sequence-of-some-children>
> </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}
> Trying to run that with Xalan spews out a long list of errors for line 18
> that ")" was expected but "," found and finally
> {noformat}
> (Position des Fehlers unbekannt)XSLT-Fehler (java.lang.StackOverflowError):
> null
> Exception in thread "main" java.lang.RuntimeException
> at org.apache.xalan.xslt.Process.doExit(Process.java:1176)
> at org.apache.xalan.xslt.Process.main(Process.java:1149)
> {noformat}
> With Saxon 12 I get no errors and e.g. the output
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <root>
> <children>
> <foo>foo 1</foo>
> <foo>foo 2</foo>
> <foo>foo 3</foo>
> </children>
> <sequence-of-some-children>
> <foo>foo 1</foo>
> <foo>foo 2</foo>
> <foo>foo 3</foo>
> <foo>foo 1</foo>
> <foo>foo 2</foo>
> <foo>foo 3</foo>
> </sequence-of-some-children>
> <de-duplicated-sequence-of-some-children>
> <foo>foo 1</foo>
> <foo>foo 2</foo>
> <foo>foo 3</foo>
> </de-duplicated-sequence-of-some-children>
> </root>
> <!--Run with Saxonica at 2025-03-20T17:13:32.9322917+01:00-->
> {code}
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