public static void createOrUpdateFilelist(WebApp webApp) {
WelcomeFileList filelist = webApp.getFileList();
if(filelist==null){
filelist = WebapplicationFactory.eINSTANCE.createWelcomeFileList();
filelist.addFileNamed("index.htm");
filelist.setWebApp(webApp);
} else {
filelist.getFile().removeAll(filelist.getFile());
filelist.addFileNamed("index.htm");
}