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Posted to dev@xalan.apache.org by xa...@xml.apache.org on 2004/10/01 23:56:32 UTC
[jira] Resolved: (XALANJ-1965) NullPointerException when using XPath Expression
Message:
The following issue has been resolved as DUPLICATE.
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View the issue:
http://issues.apache.org/jira/browse/XALANJ-1965
Here is an overview of the issue:
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Key: XALANJ-1965
Summary: NullPointerException when using XPath Expression
Type: Bug
Status: Resolved
Priority: Major
Resolution: DUPLICATE
Project: XalanJ2
Components:
XPath API
Versions:
CurrentCVS
Assignee:
Reporter: Yash Talwar
Created: Wed, 22 Sep 2004 12:53 PM
Updated: Fri, 1 Oct 2004 2:56 PM
Environment: Windows 2000. JRE 131. Xalan Java 2.6.0
Description:
The following execption occurs when I run java class:
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java.lang.NullPointerException
at org.apache.xpath.compiler.OpMap.getStepLocalName(OpMap.java:446)
at org.apache.xpath.axes.WalkerFactory.createDefaultWalker(WalkerFactory.java:1282)
at org.apache.xpath.axes.WalkerFactory.loadWalkers(WalkerFactory.java:111)
at org.apache.xpath.axes.WalkingIterator.<init>(WalkingIterator.java:61)
at org.apache.xpath.axes.WalkingIteratorSorted.<init>(WalkingIteratorSorted.java:70)
at org.apache.xpath.axes.WalkerFactory.newDTMIterator(WalkerFactory.java:281)
at org.apache.xpath.compiler.Compiler.locationPath(Compiler.java:635)
at org.apache.xpath.compiler.Compiler.compile(Compiler.java:175)
at org.apache.xpath.compiler.Compiler.compile(Compiler.java:121)
at org.apache.xpath.XPath.<init>(XPath.java:170)
at org.apache.xpath.XPath.<init>(XPath.java:199)
at TestClass.main(TestClass.java:22)
Exception in thread "main"
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Java main class:
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import javax.xml.transform.TransformerException;
import org.apache.xerces.dom.CoreDocumentImpl;
import org.apache.xerces.dom.DOMInputImpl;
import org.apache.xerces.parsers.DOMParserImpl;
import org.apache.xerces.parsers.XML11Configuration;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xpath.XPath;
import org.w3c.dom.Document;
import org.w3c.dom.ls.LSParser;
import org.w3c.dom.xpath.XPathEvaluator;
import org.w3c.dom.xpath.XPathNSResolver;
public class TestClass
{
public static void main(String[] args)
{
LSParser parser = new DOMParserImpl(new XML11Configuration());
Document doc = parser.parse(new DOMInputImpl(null, "input.xml", null));
XPathEvaluator eval = (XPathEvaluator) ((CoreDocumentImpl) doc).getFeature("+XPath", "3.0");
XPathNSResolver resolver = eval.createNSResolver(doc);
try
{
XPath xpath = new XPath("/namespace::title",null,(PrefixResolver) resolver, XPath.SELECT);
}
catch (TransformerException e)
{
e.printStackTrace();
}
}
}
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input.xml
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<?xml version="1.0"?>
<book xmlns:pre="http:exmple.com">
<title xmlns:pre1="hi">Amazing Book</title>
<author>Good Person</author>
</book>
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