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http://issues.apache.org/jira/browse/XALANJ-2108?page=comments#action_12450767 
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Santiago Pericas-Geertsen commented on XALANJ-2108:
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I reviewed and approve the changes proposed by Brian for the original patch I 
proposed. 

> incorrect use of xsl:key cause NullPointerException
> ---------------------------------------------------
>
>                 Key: XALANJ-2108
>                 URL: http://issues.apache.org/jira/browse/XALANJ-2108
>             Project: XalanJ2
>          Issue Type: Bug
>          Components: XSLTC
>    Affects Versions: 2.6
>         Environment: windows jdk 1.42.06
>            Reporter: arnaud
>         Assigned To: Santiago Pericas-Geertsen
>            Priority: Minor
>         Attachments: patch-2108-6401137.txt, patch-2108-patch2.txt, 
> xalanj-2108.xml
>
>
> my stylesheet 
> -------------
> <?xml version="1.0"?>
> <xsl:stylesheet version="1.0" 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>       <xsl:output method = "html" encoding="iso-8859-1" />
>       
>       <xsl:variable name = "x" select = "'1'" />
>       <xsl:variable name = "y" select = "'4'" />
>       <xsl:key name = "key_test"  match ="test" use = "substring(date, $x, 
> $y)" />
>       
>       <xsl:template match="/">        
>       </xsl:template>
> </xsl:stylesheet>
> xml file
> <test><date>2004-01-01</date></test>
> java.lang.NullPointerException
>       at 
> java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:980)
>       at java.lang.Double.valueOf(Double.java:202)
>       at 
> org.apache.xalan.xsltc.runtime.BasisLibrary.stringToReal(BasisLibrary.java:838)
>       at ent_recherche_simple.buildKeys()
>       at ent_recherche_simple.transform()
>       at 
> org.apache.xalan.xsltc.runtime.AbstractTranslet.transform(AbstractTranslet.java:580)

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