Martin Honnen created XALANJ-2801:
-------------------------------------
Summary: 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
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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