First of all, I would place those setProperty calls in a static initializer so you don't call them each time. Also, realize that it will always take some time the first time you create a factory and/or builder.
If you run your test "n" times, you should find it much faster on average with the system properties set. -----Original Message----- From: Jos van den Oever [mailto:[EMAIL PROTECTED] Sent: Monday, February 14, 2005 7:35 AM To: [EMAIL PROTECTED] Subject: Re: dom build speed Hallo Rick, Thanks for your reply. I added your suggested lines to the code, but I see no speed increase at all. Just to make sure, here's the code I use for parsing now: if (docbuilder == null) { System.setProperty("javax.xml.transform.TransformerFactory", "org.apache.xalan.processor.TransformerFactoryImpl"); System.setProperty("org.apache.xml.dtm.DTMManager", "org.apache.xml.dtm.ref.DTMManagerDefault"); System.setProperty("javax.xml.parsers.DocumentBuilderFactory", "org.apache.xerces.jaxp.DocumentBuilderFactoryImpl"); System.setProperty("javax.xml.parsers.SAXParserFactory", "org.apache.xerces.jaxp.SAXParserFactoryImpl"); System.setProperty( "org.apache.xerces.xni.parser.XMLParserConfiguration", "org.apache.xerces.parsers.XML11Configuration"); DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); System.out.println(factory); factory.setNamespaceAware(true); factory.setValidating(false); factory.setExpandEntityReferences(false); docbuilder = factory.newDocumentBuilder(); docbuilder.setErrorHandler(errorHandler); System.out.println(docbuilder); } InputSource is = new InputSource(rwm); // output that measures the DOM parse time long t = System.currentTimeMillis(); doc = docbuilder.parse(is); t = System.currentTimeMillis()-t; System.out.println("parseTime: "+String.valueOf(t)); Could the DOCTYPE declaration have anything to do with it? <?xml version="1.0"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> Cheers, Jos PS, parsing the file with the qt library takes ~7 ms... On Monday 14 February 2005 13:14, Rick Bullotta wrote: > Add these system properties to your code and you may see a DRAMATIC > increase in performance in DOM creation as well as Xpath and Transformer > creation. Using this technique bypasses a lot of very expensive factory > overhead which involves searching in the JAR file and the classpath for > configuration information. > > // Xalan > > System.setProperty("javax.xml.transform.TransformerFactory", > "org.apache.xalan.processor.TransformerFactoryImpl"); > > System.setProperty("org.apache.xml.dtm.DTMManager", > "org.apache.xml.dtm.ref.DTMManagerDefault"); > > // Xerces > > System.setProperty("javax.xml.parsers.DocumentBuilderFactory", > "org.apache.xerces.jaxp.DocumentBuilderFactoryImpl"); > > System.setProperty("javax.xml.parsers.SAXParserFactory", > "org.apache.xerces.jaxp.SAXParserFactoryImpl"); > > System.setProperty("org.apache.xerces.xni.parser.XMLParserConfiguration", > "org.apache.xerces.parsers.XML11Configuration"); > > > Rick Bullotta > CTO > Lighthammer Software (http://www.lighthammer.com) > > -----Original Message----- > From: Jos van den Oever [mailto:[EMAIL PROTECTED] > Sent: Monday, February 14, 2005 6:56 AM > To: [EMAIL PROTECTED] > Subject: Re: dom build speed > > > I've run up against this problem as well. If I'm not mistaken, the > > problem is the way Xerces handles setting properties on a DOM parser > > via the JAXP interfaces. Xerces will create a new instance (!) of the > > DOMParser class for every single property you set (i.e., via > > setValidating(), setNamespaceAware(), etc.). This wouldn't be so bad > > if it wasn't so expensive to create a DOMParser instance, but it is. > > You should really be timing the parse and not the setup and parse. > > > > I was sort of shocked when I first discovered how poorly Xerces > > handles setting JAXP DocumentBuilder properties, but from > > conversations on this mailing list it's obviously a known problem and > > there doesn't seem to be much that can be done about it. Shrug. > > Hello Curtis, > > What I didn't mention: I'm reusing the DocumentBuilder and this gives me > only > a small speedup. What I'm timing is the parsing itself, not the creation of > the DocumentBuilder. Even if creating the DocumentBuilder was really slow, > it > wouldn't really be a problem because I'm using it in a Bean and it's only > created once per Bean. > > Cheers, Jos > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
