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I am migrating my web application from Jboss 4.2 to tomcat 7 . After using the tomcat 7 i am facing the following exception. java.lang.NoSuchMethodException: org.apache.catalina.deploy.WebXml addServlet at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:855) at org.apache.tomcat.util.digester.SetNextRule.end(SetNextRule.java:201) at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1051) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1537) at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1883) at org.apache.catalina.startup.ContextConfig.getDefaultWebXmlFragment(ContextConfig.java:1469) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1246) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.Lif

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