Jetty 9 embedded Servlet 3.0 annotations without war file

AnnotationScanner.java

public class AnnotationScanner {

    protected void scanForAnnotations(final String javaPackage, WebAppContext webapp) throws Exception {
        Set<AnnotationParser.Handler> handlers = new HashSet<>();
        handlers.add(new WebServletAnnotationHandler(webapp));
        handlers.add(new WebFilterAnnotationHandler(webapp));
        handlers.add(new WebListenerAnnotationHandler(webapp));

        AnnotationParser annotationParser = new AnnotationParser();
        for (URL url : ((URLClassLoader) getClass().getClassLoader()).getURLs()) {
            if (!url.getProtocol().equals("file")) {
                throw new IllegalArgumentException(url.toString());
            }

            final File file = new File(url.getFile());
            if (file.isDirectory()) {
                annotationParser.parse(handlers, url.toURI(), createFolderResolver(file, javaPackage));
            } else if (file.isFile() && file.getName().endsWith(".jar")) {
                annotationParser.parse(handlers, url.toURI(), createClassNameResolver(javaPackage));
            } else {
                throw new IllegalArgumentException(url.toString());
            }
         }
    }

    private ClassNameResolver createFolderResolver(final File file, final String javaPackage) {
        String pathPrefix = file.toString() + File.separatorChar +
                javaPackage.replace('.', File.separatorChar);
        return createClassNameResolver(pathPrefix);
    }

    private ClassNameResolver createClassNameResolver(final String prefix) {
        return new ClassNameResolver() {
            @Override
            public boolean shouldOverride(String name) {
                return false;
            }

            @Override
            public boolean isExcluded(String name) {
                return !name.startsWith(prefix);
            }
        };
    }

    public void dumpServletContext(WebAppContext webAppContext) {
        ServletHandler servletHandler = webAppContext.getServletHandler();
        for (ServletMapping servletMapping : servletHandler.getServletMappings()) {
            System.out.print(Arrays.asList(servletMapping.getPathSpecs()));
            System.out.println(" " + servletHandler.getServlet(servletMapping.getServletName()).getClassName());
        }

        for (FilterMapping filterMapping : servletHandler.getFilterMappings()) {
            System.out.print(Arrays.asList(filterMapping.getPathSpecs()));
            System.out.println(" " + servletHandler.getFilter(filterMapping.getFilterName()).getClassName());
        }
    }
}