[XERCESJ-1604] Big CDATA section cause a loop

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: DOM (Level 3 Core)
• Assignee: Unassigned
• Reporter: Maurizio Merli
• Created: 05/Feb/13 18:48
• Updated: 05/Feb/13 20:12
• Resolved: 05/Feb/13 20:12

Description

Parsing a document with a big CDATA section (about 25MB) with the feature "http://apache.org/xml/features/dom/defer-node-expansion" set to false, cause an infinite loop.

Use this test class on the attachment.

package test;

import java.io.File;
import java.io.FileInputStream;
import java.util.concurrent.TimeUnit;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

public class BigCData {

public static void main(String[] args) throws Exception {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(
"org.apache.xerces.jaxp.DocumentBuilderFactoryImpl", BigCData.class.getClassLoader());
factory.setNamespaceAware(true);
factory.setValidating(false);
try

{ factory.setFeature("http://apache.org/xml/features/dom/defer-node-expansion", false); factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); // factory.setAttribute("http://apache.org/xml/properties/input-buffer-size", new Integer(100000000)); }

catch (Throwable ex)

{ System.err.println("Cannot set IGNORE DTD feature. You can have performace problems."); }

XPathExpression xpath = XPathFactory.newInstance().newXPath().compile("//style");

long t0 = System.nanoTime();
File file = new File("/Users/maurizio/Downloads/web_dossier_mars.xml");
Document doc = factory.newDocumentBuilder().parse(new FileInputStream(file));
long dt = System.nanoTime() - t0;

System.out.println(TimeUnit.NANOSECONDS.toMillis(dt) + " parse > " + doc);

String nodeValue = xpath.evaluate(doc);

dt = System.nanoTime() - t0;
System.out.println(TimeUnit.NANOSECONDS.toMillis(dt) + " xpath > " + nodeValue.length());
}

}

Issue Links

• duplicates: XERCESJ-1382 Performance problem in org.apache.xerces.dom.CharacterDataImpl appendData