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compile time java.lang.ClassCastException
Added by Anonymous about 15 years ago
Legacy ID: #7377295
Legacy Poster: Greg Knittl (gknittl)
Testcase: (errorstack.xsl) <?xml version="1.0"
encoding="UTF-8"?> <xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
version="2.0"> <xsl:template
name="main"> <xsl:variable name="row"
as="element()*"> <xsl:for-each-group
select="'fred'" group-by="@cat">
<xsl:sort select='current-grouping-key()'/>
</xsl:for-each-group> </xsl:variable> <xsl:sequence
select="$row[@num eq '1']/xs:decimal(@amt)"/>
</xsl:template> </xsl:stylesheet> Invocation: java
net.sf.saxon.Transform -it main -t "errorstack.xsl" Output: Saxon
9.1.0.6J from Saxonica Java version 1.6.0_07 java.lang.ClassCastException:
net.sf.saxon.expr.Literal cannot be cast to net.sf.saxon.expr.VariableReference at
net.sf.saxon.expr.LetExpression.replaceVariable(LetExpression.java:517) at
net.sf.saxon.expr.LetExpression.replaceVariable(LetExpression.java:514) at
net.sf.saxon.expr.LetExpression.optimize(LetExpression.java:208) at
net.sf.saxon.expr.ExpressionVisitor.optimize(ExpressionVisitor.java:200) at
net.sf.saxon.style.XSLTemplate.compile(XSLTemplate.java:345) at
net.sf.saxon.style.XSLStylesheet.compileStylesheet(XSLStylesheet.java:1089) at
net.sf.saxon.PreparedStylesheet.setStylesheetDocument(PreparedStylesheet.java:346) at
net.sf.saxon.PreparedStylesheet.prepare(PreparedStylesheet.java:163) at
net.sf.saxon.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:139) at
net.sf.saxon.Transform.doTransform(Transform.java:682) at
net.sf.saxon.Transform.main(Transform.java:66) Fatal error during transformation:
java.lang.ClassCastException: net.sf.saxon.expr.Literal cannot be cast to
net.sf.saxon.expr.VariableReference
Legacy ID: #7378104
Legacy Poster: Michael Kay (mhkay)
This is caused by two optimizations getting in the way of each other. The system has
decided that the variable $row is eligible for indexing (although this doesn't actually
happen except under Saxon-SA) because of the way it is used in a filter expression, and
it has also discovered that the value of $row will always be an empty sequence, and in
effect it falls over marking the empty sequence as being suitable for indexing. I will
raise a patch in Subversion.
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