protected static synchronized void init(Set<String> urlFilters, Set<String> packageFilters) {
protected static synchronized void init(Set<String> urlFilters, Set<String> packageFilters, ServletContext context) {
    protected static synchronized void init(Set<String> urlFilters, Set<String> packageFilters) {        ActionClassCache instance = new ActionClassCache();        instance.beans = ResolverUtil.getImplementations(ActionBean.class,                                                         urlFilters,                                                         packageFilters);        ActionClassCache.cache = instance;    }