getDeclaredFields of reflection not found with inherits java

I hope they are well, I have a query to do and it is that I am automating the ups and downs, in fact they work only that they do not walk with the inheritances:

ParamBuilder.java

private LinkedList<Object>loadMethods(IPersistente ip) throws Exception{
       LinkedList<Method> m = new LinkedList(); 
// my problem is in the getDeclaredMethods() that I use it to get me the  enter code here get of the created class but not those of the superclass.  
       for(Method campo : ip.getClass().getDeclaredMethods()){
            if (campo.getName().startsWith("get") && !campo.getName().startsWith("getClass")) {
                Method metodo = campo;
                if(metodo.getParameterCount() == 0) {
                    if(metodo.isAnnotationPresent(Sort.class)){
                        m.add(metodo);
                    }
                }
            }            
        }
        if(ip instanceof IDependiente && !ip.check()){
            Collections.sort(m, new SortDesc());
        } else {
            Collections.sort(m, new SortAsc());
        }
        return load(ip, m);
    }

In UserModel I tried to use casting but it did not work, and so I have the save of it:

    @Override
        public void save(IPersistente row) throws Exception {
            if(row.getId() == 0){
                System.out.println(this.sp.insert());
// I do not get the get of the user class, I tried to use downcasting but it did not work.
                this.sp.getBD().conmand(this.sp.insert(), this.pm.getParam(row));
                row.setId(this.maxId());
            } else {
                System.out.println(this.sp.update());
                this.sp.getBD().conmand(this.sp.update(), this.pm.getParam(row));
            }        
            if(row instanceof Comprador){
                Comprador c = (Comprador) row;
                new CompradorModel(this.ip).save(c);
            } else if(row instanceof Subastador){
                Subastador s = (Subastador) row;
                new SubastadorModel(this.ip).save(s);
            } else {
                Administrador a = (Administrador) row;
                new AdministradorModel(this.ip).save(a);
            }  
        }

Let's say I'm new using Reflections, Metadata and Annotations in Java, I have not been around for weeks.

I await your answers, which I will be grateful for.

regards