Hi Neeraj, What ships in Java 5 isn't exactly Xerces. It's Sun's four year old fork off the Apache codebase. It has bugs (and performance issues) which are unique to it and others which have long been fixed in Apache. We have no influence over what code ships in the JDK or know specifically what they changed. If you're looking for improvements to jdk1.5.0_06 you'll need to approach Sun in one of their forums.
I doubt you'll find that any of these are hot-spots in the current version of Apache Xerces (2.9.1). Thanks. Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: [EMAIL PROTECTED] E-mail: [EMAIL PROTECTED] niraj19july <[EMAIL PROTECTED]> wrote on 06/16/2008 10:07:52 AM: > Hi, > > I am using the apache xerces DOM distribution embedded in jdk1.5.0_06. I > have configured the DOM Parser to be in the non-validation mode and to be > not namespace aware. No other 'features' have been enabled as well. While > profiling the code I am seeing some hotspots in the HPROF dump. My profiling > included millions of small xml documents. > > Here are my questions on the same (see the actual stack further below): > > STACK 1 > It is probably checking for EOF and hence resulting in EOFException. Why to > throw Exception? It is wasting CPU cycles. > > STACK 2 and STACK 3 are identical except that STACK 3 is throwing > XNIException. Why is checkFeature() getting called ? > > After looking at the parser code it looks like XIncludeHandler is added as > XMLcomponent (for xml 1.0 documents ) and reset() flow of XIncludeHandler > results in checkFeature(). Is there any way to prevent such checks and save > CPU cycles? What features parser is trying to check? > > Further, my application is not able to catch XNIException even though it is > been wrapped in SAXException in the parser code? So it looks that this is > not a fatal error. > > I think if xml version of the documents is 1.1 then XIncludeHandler's > reset() method will not be invoked in the resetXML11() method . But this is > not a solution for me as I am dealing with xml 1.0 documents. > > Please help. > > Thanks, > Neeraj. > > Complete stack traces follow: > > STACK-1 > > TRACE 305135: > java.lang.Throwable.fillInStackTrace(Throwable.java:Unknown line) > java.lang.Throwable.<init>(Throwable.java:181) > java.lang.Exception.<init>(Exception.java:29) > java.io.IOException.<init>(IOException.java:28) > java.io.EOFException.<init>(EOFException.java:32) > com.sun.org.apache.xerces.internal.impl.XMLEntityScanner. > load(XMLEntityScanner.java:1760) > com.sun.org.apache.xerces.internal.impl.XMLEntityScanner. > skipSpaces(XMLEntityScanner.java:1259) > com.sun.org.apache.xerces.internal.impl. > XMLDocumentScannerImpl$TrailingMiscDispatcher. > dispatch(XMLDocumentScannerImpl.java:1247) > com.sun.org.apache.xerces.internal.impl. > XMLDocumentFragmentScannerImpl. > scanDocument(XMLDocumentFragmentScannerImpl.java:368) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:834) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:764) > com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148) > com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:250) > com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl. > parse(DocumentBuilderImpl.java:292) > oracle.ocs.protocols.xmpp.library.ParserInitializer. > getXMLDocument(ParserInitializer.java:268) > STACK 2 > > TRACE 305871: > com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings. > checkFeature(ParserConfigurationSettings.java:300) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > checkFeature(XML11Configuration.java:1313) > com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings. > getFeature(ParserConfigurationSettings.java:245) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > getFeature(XML11Configuration.java:873) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > copyFeatures1(XIncludeHandler.java:2093) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > copyFeatures(XIncludeHandler.java:2068) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > reset(XIncludeHandler.java:446) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > reset(XML11Configuration.java:973) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:805) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:764) > com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148) > com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:250) > com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl. > parse(DocumentBuilderImpl.java:292) > oracle.ocs.protocols.xmpp.library.ParserInitializer. > getXMLDocument(ParserInitializer.java:268) > > _ > TRACE 306139: > java.lang.Throwable.fillInStackTrace(Throwable.java:Unknown line) > java.lang.Throwable.<init>(Throwable.java:196) > java.lang.Exception.<init>(Exception.java:41) > java.lang.RuntimeException.<init>(RuntimeException.java:43) > com.sun.org.apache.xerces.internal.xni.XNIException. > <init>(XNIException.java:94) > com.sun.org.apache.xerces.internal.xni.parser. > XMLConfigurationException.<init>(XMLConfigurationException.java:109) > com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings. > checkFeature(ParserConfigurationSettings.java:300) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > checkFeature(XML11Configuration.java:1313) > com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings. > getFeature(ParserConfigurationSettings.java:245) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > getFeature(XML11Configuration.java:873) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > copyFeatures1(XIncludeHandler.java:2093) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > copyFeatures(XIncludeHandler.java:2070) > com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler. > reset(XIncludeHandler.java:446) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > reset(XML11Configuration.java:973) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:805) > com.sun.org.apache.xerces.internal.parsers.XML11Configuration. > parse(XML11Configuration.java:764) > com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148) > com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:250) > com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl. > parse(DocumentBuilderImpl.java:292) > oracle.ocs.protocols.xmpp.library.ParserInitializer. > getXMLDocument(ParserInitializer.java:268) > -- > View this message in context: http://www.nabble.com/JDK-XERCES-DOM- > PARSER-WASTES-CPU-ON-NON-PARSING-TASKS-tp17865215p17865215.html > Sent from the Xerces - J - Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED]
