defaultServlet cant find index.html - spring

Question

i implemented a servlet container, Ioc without any dependency.
and when i try to forward to static/resource i set this request to go DefaultServlet.
public class DefaultServlet extends HttpServlet {
for processing about all the static resouces under resource folder
(index.html)
but the path of request response with 'file not exists' in this Default
how can get path of static resource?
this is my code
there are no settings about servlet, and ioc
private void selfInitialize(ServletContext servletContext) {
ServletRegistration.Dynamic gServlet = servletContext.addServlet(GCI_SERVLET_NAME,new DefaultServlet());
gServlet.setLoadOnStartup(1);
gServlet.addMapping("/");
// ServletRegistration.Dynamic servletRegistration = servletContext.addServlet(DISPATCHER_SERVLET_NAME, new DispatcherServlet());
// servletRegistration.setLoadOnStartup(2);
// servletRegistration.addMapping("/");
FilterRegistration.Dynamic filterRegistration = servletContext.addFilter("encodingFilter", new CharacterEncodingFilter());
filterRegistration.addMappingForUrlPatterns(null, false, "/*");
}
this is my ioc container, and not implements ResourceLoader
public class ApplicationContext implements BeanFactory {
private static ApplicationContext context = new ApplicationContext();
private static final Logger log = LoggerFactory.getLogger(ApplicationContext.class);
private static Map<String, CustomBeanDefinition> beanDefinitions;
CustomBeanDefinitionGenerator generator;
private Set<Class<?>> requiredBeans;
BeanScanner scan;
private ApplicationContext() {};
public void initialize(String basePackage) {
log.debug("star to scan : {}", basePackage);
scan = new BeanScanner(basePackage);
requiredBeans = scan.getTypesWith(Controller.class, Service.class, Component.class);
generator = new CustomBeanDefinitionGenerator(requiredBeans);
generator.instantiate();
generator.registerBean();
beanDefinitions = generator.getBeanDefinitions();
}
public static ApplicationContext getInstance(){
if(context != null){
return context;
}
return new ApplicationContext();
}
public static Map<String, CustomBeanDefinition> getAllBeanDefinitions() {
return beanDefinitions;
}
public static Set<Object> getAllBeans() {
return beanDefinitions
.values()
.stream()
.map(CustomBeanDefinition::getBean)
.collect(Collectors.toSet());
}
#Override
public Object getBean(Class<?> clazz) {
String beanName = createBeanName(clazz);
return getBean(beanName);
}
public Object getBean(String beanName) {
return beanDefinitions.get(beanName).getBean();
}
}
in this code of DefaultServlet.
resource.exist() return false