[XALANJ-1048] NullPointerException if non-existent node passed to extension function

• Type: Bug
• Status: Resolved
• Resolution: Fixed
• Affects Version/s: 2.3
• Component/s: Xalan-extensions
• Environment: Operating System: Other; Platform: Other
• Bugzilla Id: 9731
• Assignee: Unassigned
• Reporter: Simon Kitching
• Created: 10/Jun/02 09:01
• Updated: 16/Feb/11 23:06
• Resolved: 02/Sep/04 21:19

Description

If an extension function exists which takes a Node parameter, and an xslt tag
specifies as a parameter a path to a node that does not exist, then a
NullPointerException is thrown before the extension function is invoked.

I would have expected null to be passed as the node instead.

Note that if the extension function takes a String instead, an empty string is
passed to the extension function in place of the invalid node.

eg

<?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3c.org/1999/XSL/Transform"
xmlns:ecn="xalan://nz.co.ecnetwork.xsltmap">

<xsl:template match="/">
<xsl:value-of select="ecn:Extensions.doIt(nosuchnode)"/>
</xsl:template>

package nz.co.ecnetwork.xsltmap;
public class Extensions
{
public static String doIt(Node node)

{ System.err.println("this never gets called if node doesn't exist"); }

}

platform details:

• sun java 1.4.0 on linux
• xalan-j 2.3.1 (using java.endorsed.dirs to override rt.jar)
• default xml parser

• • • • Any suggestions for workarounds for this problem welcome!!!!