I referred to this post http://whyjava.wordpress.com/2009/08/30/creating-struts2-application-on-google-app-engine-gae/
Getting this error.... Jun 8, 2010 10:31:06 AM com.google.apphosting.utils.jetty.JettyLogger info INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger Jun 8, 2010 10:31:06 AM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml INFO: Successfully processed C:\Users\Gaurav Munjal\workspace\SampleStruts\war\WEB-INF/appengine-web.xml Jun 8, 2010 10:31:06 AM com.google.apphosting.utils.jetty.JettyLogger warn WARNING: fa...@null line:2 col:6 : org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed. Jun 8, 2010 10:31:06 AM com.google.apphosting.utils.config.AbstractConfigXmlReader getTopLevelNode SEVERE: Received SAXException parsing the input stream for C:\Users\Gaurav Munjal\workspace\SampleStruts\war\WEB-INF/web.xml org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:701) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1016) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:669) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:954) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at org.mortbay.xml.XmlParser.parse(XmlParser.java:230) at com.google.apphosting.utils.config.AbstractConfigXmlReader.getTopLevelNode(AbstractConfigXmlReader.java:206) at com.google.apphosting.utils.config.AbstractConfigXmlReader.parse(AbstractConfigXmlReader.java:228) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:142) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:22) at com.google.apphosting.utils.config.AbstractConfigXmlReader.readConfigXml(AbstractConfigXmlReader.java:111) at com.google.apphosting.utils.config.WebXmlReader.readWebXml(WebXmlReader.java:73) at com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml(AbstractContainerService.java:237) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:144) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) Jun 8, 2010 10:31:06 AM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml SEVERE: Received exception processing C:\Users\Gaurav Munjal\workspace\SampleStruts\war\WEB-INF/web.xml com.google.apphosting.utils.config.AppEngineConfigException: Received SAXException parsing the input stream for C:\Users\Gaurav Munjal\workspace\SampleStruts\war\WEB-INF/web.xml at com.google.apphosting.utils.config.AbstractConfigXmlReader.getTopLevelNode(AbstractConfigXmlReader.java:214) at com.google.apphosting.utils.config.AbstractConfigXmlReader.parse(AbstractConfigXmlReader.java:228) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:142) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:22) at com.google.apphosting.utils.config.AbstractConfigXmlReader.readConfigXml(AbstractConfigXmlReader.java:111) at com.google.apphosting.utils.config.WebXmlReader.readWebXml(WebXmlReader.java:73) at com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml(AbstractContainerService.java:237) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:144) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) Caused by: org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:701) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1016) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:669) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:954) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at org.mortbay.xml.XmlParser.parse(XmlParser.java:230) at com.google.apphosting.utils.config.AbstractConfigXmlReader.getTopLevelNode(AbstractConfigXmlReader.java:206) ... 12 more com.google.apphosting.utils.config.AppEngineConfigException: Received SAXException parsing the input stream for C:\Users\Gaurav Munjal\workspace\SampleStruts\war\WEB-INF/web.xml at com.google.apphosting.utils.config.AbstractConfigXmlReader.getTopLevelNode(AbstractConfigXmlReader.java:214) at com.google.apphosting.utils.config.AbstractConfigXmlReader.parse(AbstractConfigXmlReader.java:228) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:142) at com.google.apphosting.utils.config.WebXmlReader.processXml(WebXmlReader.java:22) at com.google.apphosting.utils.config.AbstractConfigXmlReader.readConfigXml(AbstractConfigXmlReader.java:111) at com.google.apphosting.utils.config.WebXmlReader.readWebXml(WebXmlReader.java:73) at com.google.appengine.tools.development.AbstractContainerService.loadAppEngineWebXml(AbstractContainerService.java:237) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:144) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) Caused by: org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:701) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1016) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:669) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:954) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at org.mortbay.xml.XmlParser.parse(XmlParser.java:230) at com.google.apphosting.utils.config.AbstractConfigXmlReader.getTopLevelNode(AbstractConfigXmlReader.java:206) ... 12 more -- Regards, Gaurav Munjal 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