Spring 5 Binder, #InitBinder, not populating model correctly - spring-mvc

Question

I am upgrading a Spring 2.5 web app to Spring 5.0.3. I am using String form tags. In my controller I have:
#InitBinder
public void initBinder(WebDataBinder binder, HttpServletRequest request) {
CapTypeEditor capTypeEditor = new CapTypeEditor(this.getDAOFactory());
binder.registerCustomEditor(CapType.class, "order.capType.id", capTypeEditor);
}
I see that this is called twice (why?) on GET and twice on POST. On GET, the request.getParameter("order.capType.id") is null, the same in POST has the correct ID. But then in my submit() POST method, capType is not null, but it has only the id populated and not its name:
#RequestMapping(value = "/es/orderinfo.html", method=RequestMethod.POST)
public ModelAndView submit(#RequestParam("id") long id,
#ModelAttribute("command")OrderInfoBean bean,
BindingResult errors, ModelMap model,
HttpServletRequest request) {
Order order = bean.getOrder();
CapType ct = order.getCapType();
...
}
My CapType editor is never called:
public class CapTypeEditor extends PropertyEditorSupport {
DAOFactory daoFactory;
public CapTypeEditor(DAOFactory daoFactory){
this.daoFactory = daoFactory;
}
public void setAsText(String text){
if(StringUtils.isBlank(text)||StringUtils.isEmpty(text) ){
this.setValue(null);
return;
}
Long id = Long.valueOf(text);
CapType capType = daoFactory.getCapTypeDAO().read(id);
this.setValue(capType);
}
public String getAsText(Object value){
if(value == null) return StringUtils.EMPTY;
CapType capType = (CapType)value;
return capType.getId().toString();
}
}
My JSP looks like this:
<form:select path="order.orderType.id" tabindex="100" cssStyle="width:149px">
<form:option value="">none</form:option>
<form:options items="${refData.orderTypes }" itemValue="id" itemLabel="typeName" />
</form:select>

Answer 1

You are putting invalid property path while registering the custom editor. Do this:
binder.registerCustomEditor(CapType.class, "capType", capTypeEditor);
Assuming, OrderInfoBean contains a field capType.
binder.registerCustomEditor(CapType.class, "order.capType", capTypeEditor);
As OrderInfoBean cotnains Order which contains CapType.
And in JSP, use capType order.capType directly as bindpath.

Answer 2

Actually my old editors registered in #InitBinder were OK. And #minarmahmud was right about the not having .id in the . Once I added a proper equals and hashcode function to my hibernate mapped model classes (e.g. CapType) everything worked, both the default values on the view HTML and the full auto mapping of my models together on POST. So in Model CapType:
#Override
public boolean equals(final Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
final CapType capType = (CapType) o;
return Objects.equals(id, capType.id) &&
Objects.equals(typeName, capType.getTypeName());
}
#Override
public int hashCode() {
return Objects.hash(id, typeName);
}