public MethodDescriptor getMethod(String methodName, String params) {
        Map<String, MethodDescriptor> methods = descToMethods.get(methodName);
        if (CollectionUtils.isNotEmptyMap(methods)) {
            return methods.get(params);
        }
        return null;
    }
@Test
    void testGetMethod() {
        Assertions.assertNotNull(service.getMethod("sayHello", new Class[] {String.class}));
    }