You're not using Saxon here, you're using the XSLTC processor (part of the
Xalan product). I suspect that's related to the the problem, since calling
conventions for extension functions depend on the processor you are using.

Since file:exists in Java returns a boolean, I would suggest taking out the
" = 'true'" part of the test, since comparing a boolean to a string is
somewhat error-prone.

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Cool The Breezer [mailto:techcool.kumar@xxxxxxxxx] 
> Sent: 16 March 2009 12:18
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  File:New generates error
> 
> 
> Hi,
> We have strange error started coming recently for using java 
> A= PI to check file existence. Recently we moved to saxon and 
> earlier we were using Xalan but I dont think this caused the 
> error. We were using this code since years or so without any 
> problem and this error =A0comes randomly. I am not able to 
> replicate this in dev environment. I would appreciate your 
> help on finding root cause of this problem.
> 
> XSL Code:
> 
> <xsl:template name="file-exists" xmlns:file="java.io.File">
> 
> 		<xsl:param name="filename"/>
> 		<xsl:choose>
> 			<xsl:when 
> test="file:exists(file:new($filename)) = 'true'">true</xsl:when>
> 			<xsl:otherwise>false</xsl:otherwise>
> 		</xsl:choose>
> 	</xsl:template>
> 
> Error:
> ERROR:  'Cannot convert argument/return type in call to 
> method 'java.io.File.new(reference)''
> 
> FATAL ERROR:  'Could not compile stylesheet'
> 
>  
> 
> java.lang.ClassCastException: 
> com.sun.org.apache.xalan.internal.xsltc.compiler.Variable 
> cannot be cast to 
> com.sun.org.apache.xalan.internal.xsltc.compiler.Param
> 
>       at 
> com.sun.org.apache.xalan.internal.xsltc.compiler.SymbolTable.a
> ddParam(Unknown Source)