Bug #2412: NPE evaluating pattern containing global variable in streaming mode - Saxon - Saxonica Developer Community

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Bug #2412

closed

NPE evaluating pattern containing global variable in streaming mode

Added by Michael Kay over 9 years ago. Updated almost 9 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Michael Kay

Category:

Streaming

Sprint/Milestone:

9.6.0.7

Start date:

2015-07-04

Due date:

% Done:

100%

Estimated time:

Legacy ID:

Applies to branch:

9.6

Fix Committed on Branch:

9.6

Fixed in Maintenance Release:

9.6.0.7

Platforms:

Description

From saxon-help list:

Saxon-EE 9.6.0.6J gives me a strange NullPointerException, which only

occurs in streaming mode. If I run the same document without streaming

mode, everything works// as expected. The issue seems to be related to

using a parameter in an XPath expression.

Below is a stylesheet that illustrates the problem. I want to iterate

over all nodes whose name matches the parameter.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

version="3.0">

<xsl:param name="node-name" required="yes"/>

<xsl:mode streamable="yes"/>

<xsl:template match="/">

 <xsl:for-each select="//node()[name() = $node-name]">

   <found/>

 </xsl:for-each>

</xsl:template>

</xsl:stylesheet>

Here is an example input document:

   <a>abc</a>

   <b>def</b>

   <a>abc</a>

   <b>def</b>

Here is how I run Saxon from command line:

java -cp SaxonEE9-6-0-6J/saxon9ee.jar net.sf.saxon.Transform -s:in.xml

-xsl:stylesheet.xsl -o:out.xml node-name=record

I use a Linux system. My Java Runtime Engine is (output of "java -version"):

openjdk version "1.8.0_45"

OpenJDK Runtime Environment (build 1.8.0_45-b14)

OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)

If I remove the xsl:mode element in the stylesheet, I get the expected

result (). In streaming mode, I get the

following exception:

java.lang.NullPointerException

net.sf.saxon.expr.XPathContextMajor.getTargetComponent(XPathContextMajor.java:778)

net.sf.saxon.expr.XPathContextMinor.getTargetComponent(XPathContextMinor.java:554)

net.sf.saxon.expr.GlobalVariableReference.evaluateVariable(GlobalVariableReference.java:93)

com.saxonica.ee.optim.IndexedLookupExpression.effectiveBooleanValue(IndexedLookupExpression.java:266)

net.sf.saxon.pattern.PatternWithPredicate.matchesPredicate(PatternWithPredicate.java:119)

net.sf.saxon.pattern.PatternWithPredicate.matchesBeneathAnchor(PatternWithPredicate.java:138)

com.saxonica.ee.stream.watch.PatternWatch.matchesNode(PatternWatch.java:33)

com.saxonica.ee.stream.watch.WatchManager.startElement(WatchManager.java:208)

net.sf.saxon.event.StartTagBuffer.startContent(StartTagBuffer.java:220)

net.sf.saxon.event.ReceivingContentHandler.startElement(ReceivingContentHandler.java:356)

com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)

com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:379)

com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:605)

com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3138)

com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880)

com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)

com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)

com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)

com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)

com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)

com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)

com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)

com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)

at net.sf.saxon.event.Sender.sendSAXSource(Sender.java:441)

at net.sf.saxon.event.Sender.send(Sender.java:172)

at net.sf.saxon.Controller.transformStream(Controller.java:2319)

at net.sf.saxon.Controller.transform(Controller.java:1666)

net.sf.saxon.s9api.XsltTransformer.transform(XsltTransformer.java:547)

at net.sf.saxon.Transform.processFile(Transform.java:1056)

at net.sf.saxon.Transform.doTransform(Transform.java:659)

at net.sf.saxon.Transform.main(Transform.java:80)