unable to start jboss with eclipse.

hello all,
i just try to configure jboss with eclipse, but when i am trying to start jboss, it's giving me error, "Unable to start JBoss"..
here is part of my error log..

!SESSION 2012-03-03 02:23:14.734 -----------------------------------------------
eclipse.buildId=M20090917-0800
java.version=1.6.0_29
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product -data G:\eclipse projects\j2ee_practices -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.osgi 2 1 2012-03-03 02:24:38.234
!MESSAGE NLS unused message: contextRootLabelInvalid in: org.eclipse.jst.servlet.ui.project.facet.WebFacetInstallPage

!ENTRY org.eclipse.osgi 2 1 2012-03-03 02:24:38.234
!MESSAGE NLS unused message: contentDirLabelInvalid in: org.eclipse.jst.servlet.ui.project.facet.WebFacetInstallPage

!ENTRY org.eclipse.ui.navigator 4 0 2012-03-03 02:44:23.500
!MESSAGE Could not acquire children from extension: org.eclipse.jst.jee.ui.web
!STACK 0
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'web-app' not found. (platform:/resource/TestJB/WebContent/WEB-INF/web.xml, 3, 10)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:315)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
	at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:546)
	at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelResource(JEE5ModelProvider.java:155)
	at org.eclipse.jst.jee.model.internal.Web25ModelProvider.getModelObject(Web25ModelProvider.java:42)
	at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.getModelObject(JEE5ModelProvider.java:210)
	at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadModel(AbstractMergedModelProvider.java:226)
	at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getMergedModel(AbstractMergedModelProvider.java:208)
	at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getModelObject(AbstractMergedModelProvider.java:128)
	at org.eclipse.jst.jee.ui.internal.navigator.JEE5ContentProvider.getCachedContentProvider(JEE5ContentProvider.java:87)
	at org.eclipse.jst.jee.ui.internal.navigator.Web25ContentProvider.getChildren(Web25ContentProvider.java:35)
	at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:90)
	at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:246)
	at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getChildren(NavigatorContentServiceContentProvider.java:221)
	at org.eclipse.jst.jee.ui.internal.navigator.JEE5ContentProvider$1.run(JEE5ContentProvider.java:113)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
Caused by: org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'web-app' not found. (platform:/resource/TestJB/WebContent/WEB-INF/web.xml, 3, 10)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.reportUnknownFeature(XMLHandler.java:1990)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleUnknownFeature(XMLHandler.java:1954)
	at org.eclipse.emf.ecore.xmi.impl.XMIHandler.handleUnknownFeature(XMIHandler.java:151)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFeature(XMLHandler.java:1898)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:1023)
	at org.eclipse.emf.ecore.xmi.impl.XMIHandler.processElement(XMIHandler.java:87)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:1001)
	at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:712)
	at org.eclipse.emf.ecore.xmi.impl.XMIHandler.startElement(XMIHandler.java:169)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(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.XMLNSDocumentScannerImpl.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 javax.xml.parsers.SAXParser.parse(Unknown Source)
	at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:181)
	at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:180)
	at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1494)
	at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1282)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:255)
	at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.demandLoad(ProjectResourceSetImpl.java:358)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:270)
	... 37 more

!ENTRY org.eclipse.wst.xml.core 4 4 2012-03-03 04:08:46.109
!MESSAGE 
!STACK 0
org.w3c.dom.DOMException: 
	at org.eclipse.wst.xml.core.internal.document.ElementImpl.insertBefore(ElementImpl.java:690)
	at org.eclipse.wst.xml.core.internal.document.XMLModelParser.insertNode(XMLModelParser.java:1309)
..........................................................................................................................................................................................................................................................................

solved the problem, by configuring jboss 4.0, instead of 5.0...

When configuring a JBoss AS server in Eclipse, Eclipse looks for various files within the JBoss directory to verify that it contains a valid JBoss AS installation. The files looked for changes with every version of JBoss AS. You might be better off using a more recent version of Eclipse, and with using JBoss Tools - the tools track the constant shuffling of JBoss AS files much better than Eclipse itself.