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Why do I have a this wicket problem in JAVA?

In the first form I enter a number that will call a service and then return the data on the same page.
The first part works fine but the problem lies when I want to display the data obtained on the screen.
Sorry if my English is hard to understand
Here a consultation Page.
<wicket:extend>
<div>
<form wicket:id="form" class="flex-1 flex-column">
<div class="field">
<label for="service">Ingrese numero de tramite</label>
<input type="text" name="tramite" id="service" wicket:id="tramite" required>
</div>
<div >
<a wicket:id="service" class="ui button" type="submit">Invocar servicio</a>
</div>
</form>
</div>
<div>
<table>
<tr wicket:id="item">
<td wicket:id="tributo">Tributo</td>
<td wicket:id="cuenta">Cuenta</td>
<td wicket:id="tipoDoc">TipoDoc</td>
<td wicket:id="nroDoc">NroDoc</td>
</tr>
</table>
</div>
</wicket:extend>
Fragment of java class PaginaPruebaServicioTitularAsociado which extends from WebPage:
private void addForm() {
modelTramite = new Model<>();
Form form = new Form<>("form");
form.add(new TextField<>("tramite",modelTramite));
AjaxSubmitLink guardarLink = new AjaxSubmitLink("service") {
#Override
protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
try {
List<TitularAsociado>list1= consultaTitularesAsociados(modelTramite.getObject());
addDatos(list1);
}
catch (DfeErpException e) {
throw new RuntimeException(e.getMessage());
}
}
};
guardarLink.setOutputMarkupId(true);
form.add(guardarLink);
add(form);
}
private void addDatos(List<TitularAsociado>list1){
add(new ListView<TitularAsociado>("item", list1) {
protected void populateItem(final ListItem<TitularAsociado> listItem){
listItem.add(new Label("tributo", listItem.getModelObject().getTributo()));
listItem.add(new Label("cuenta", listItem.getModelObject().getCuenta()));
listItem.add(new Label("tipoDoc", listItem.getModelObject().getTipoDocumento()));
listItem.add(new Label("nroDoc", listItem.getModelObject().getNroDocumento()));
listItem.add(new Label("codRelacion", listItem.getModelObject().getCodigoRelacion()));
}
});
}
LOGS:
Handling the following exception
org.apache.wicket.markup.MarkupNotFoundException: Can not determine Markup. Component is not yet connected to a parent. [Page class = webapp.PaginaPruebaServicioTitularAsociado, id = 3, render count = 1]
at org.apache.wicket.Component.getMarkup(Component.java:750)

How to set object field with thymeleaf

My Student class has list 'Objects'.
public class Student {
private List<Objects> list;
...
}
public class Objects {
private long id;
private String context;
...
}
#GetMapping("signup")
public String showSignUpForm(Model model) {
List<Objects> objectsList = new ArrayList<>();
objectsList.add(new Objects(1, "Math"));
objectsList.add(new Objects(2, "Phys"));
objectsList.add(new Objects(3, "Chem"));
objectsList.add(new Objects(4, "Geom"));
model.addAttribute("objects", objectsList);
model.addAttribute("student", new Student());
return "add-student";
}
#PostMapping("add")
public String addStudent(Student student, BindingResult result, Model model) {
if (result.hasErrors()) {
return "add-student";
}
return "redirect:list";
}
<form action="#" th:action="#{/students/add}" th:object="${student}" method="post">
<div class="group">
<div th:each="obj : ${objects}">
<input id="check" type="checkbox" th:field="*{list}" th:value="${obj}"/>
<label for="check" th:text="${obj.getContext()}"></label>
</div>
<div class="col-md-6">
<input type="submit" class="btn btn-primary" value="Submit">
</div>
</div>
</form>
So I want to add selected objects to student.list but I get this error:
Failed to convert property value of type 'java.lang.String[]' to required type 'java.util.List' for property 'list'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'example.Objects' for property 'list[0]': no matching editors or conversion strategy found
How to do it right?

First of all, if you want to work with list you have to do it by index. So if you want to bind a list you have to do like below.
#GetMapping("signup")
public String showSignUpForm(Model model) {
List<Objects> objectsList = new ArrayList<>();
objectsList.add(new Objects(1, "Math"));
objectsList.add(new Objects(2, "Phys"));
objectsList.add(new Objects(3, "Chem"));
objectsList.add(new Objects(4, "Geom"));
List<Objects> emptyList = new ArrayList<>();
Student student = new Student();
student.addList(emptyList);
model.addAttribute("objects", objectsList);
model.addAttribute("student", student);
return "add-student";
}
<form action="#" th:action="#{/students/add}" th:object="${student}" method="post">
<div class="group">
<div th:each="obj,iterator : ${objects}">
<input id="check" type="text" th:field="*{list[${iterator.index}].id}" th:value="${obj.id}"/>
<input type="text" th:field="*{list[${iterator.index}].context}" th:value="${obj.context}"/>
</div>
<div class="col-md-6">
<input type="submit" class="btn btn-primary" value="Submit">
</div>
</div>
</form>
Secondly, if you want to do select and add then you have to use javascript. You have to track the index of the list and bind the value separately (id and context) in the correct index. You have to also consider to remove object from the list for unselection.

validate input in Thymeleaf

I have this input:
Masa: <input type="number" class="form-control form-text" name="masa"/>
<div class="text col-sm-12 error" th:if="${wzrost}" >
<p class="text text-center">
To pole jest wymagane
</p>
</div>
Wzrost: <input type="number" class="form-control form-text " name="wzrost"/>
<div class="text col-sm-12 error" th:if="${wzrost}" >
<p class="text text-center">
To pole jest wymagane
</p>
</div>
And this controller;
String x = String.valueOf(masa);
String y = String.valueOf(wzrost);
if(x==null ){
model.addAttribute("wzrost",true);
return"views/success";
}
if(y==null ){
model.addAttribute("wzrost",true);
return"views/success";
}
When I click form submit button I always get error nullpointerexception.
How do I validate input, so that when it is empty the message pops up

#PostMapping("/cal-bmi")
public String calculateBmiForm(Model model, Integer masa, Integer wzrost) {
String x = String.valueOf(masa);
String y = String.valueOf(wzrost);
if(x==null ){
model.addAttribute("wzrost",true);
return"views/success";
}
if(y==null ){
model.addAttribute("wzrost",true);
return"views/success";
}
}
ANd when i get a valu form masa and wzrost i check from null, i click submit alwas nullpointerexception
<form th:action="#{/cal-bmi}" method="post">
<ul class="gender-options">
<input id="man" type="radio" name="gender" value="male" required />
<label for="man">mężczyzna</label> ⁄
<input id="woman" type="radio" name="gender" value="female"/>
<label for="woman">kobieta</label>
</ul>
Masa: <input type="number" class="form-control form-text" required placeholder="(kg)" name="masa"/>
<!--<div class="text col-sm-12 error" th:if="${wzrost}">-->
<!--<p class="text text-center">-->
<!--To pole jest wymagane-->
<!--</p>-->
<!--</div>-->
Wzrost: <input type="number" class="form-control form-text " required placeholder="(cm)" name="wzrost"/>
<!--<div class="text col-sm-12 error" th:if="${wzrost}">-->
<!--<p class="text text-center">-->
<!--To pole jest wymagane-->
<!--</p>-->
<!--</div>-->
<input type="submit" class="col-lg-10 btn btn-primary" value="Oblicz"/>
</form>
Now i used required but is not good solution

It seems like you want to implement server side validation. For this the best approach is to use validators and its bindingResult. Steps to implement server side validation is
Have for model
public class PersonForm {
private String name;
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
}
Use form model in html
<form action="#" th:action="#{/personForm}" th:object="${personForm}" method="post">
<table>
<tr>
<td><label th:text="#{label.name}+' :'"></label></td>
<td><input type="text" th:field="*{name}" /></td>
<td th:if="${#fields.hasErrors('name')}" th:errors="*{name}">Generic Error</td>
</tr>
<tr>
<td><button type="submit">Submit</button></td>
</tr>
</table>
</form>
Have validator class
#Component
public class PersonFormValidator implements Validator {
#Override
public boolean supports(Class<?> clazz) {
return PersonForm.class.equals(clazz);
}
#Override
public void validate(Object target, Errors errors) {
ValidationUtils.rejectIfEmpty(errors, "name", "field.name.empty");
PersonForm p = (PersonForm) target;
if (p.getName().equalsIgnoreCase("XXX")) {
errors.rejectValue("name", "Name cannot be XXX");
}
}}
Bind validator to controller and let spring do the magic.
#Controller
public class WebController {
#Autowired
PersonFormValidator personFormValidator;
#InitBinder("personForm")
protected void initPersonFormBinder(WebDataBinder binder) {
binder.addValidators(personFormValidator);
}
#PostMapping("/personForm")
public String checkPersonInfo(#Validated PersonForm personForm, BindingResult bindingResult, final RedirectAttributes redirectAttributes) {
if (bindingResult.hasErrors()) {
return "personForm";
}
redirectAttributes.addFlashAttribute("personResult", apiClientService.getPersonResult(personForm));
return "redirect:/spouseForm";
}
}

Spring and hibernate persist() not working

Hello I am developing a CMS using Spring and Hibernate. I have a page displaying existing products and a form which should add a new product to the database. However when I fill out the form and submit it nothing gets saved to the database. Additionally System.out.println does not print anything to the console so I have no idea where is the problem.
jsp page
<form:form class="form-horizontal" method="post" modelAttribute="productForm">
<div class="form-group">
<label class="col-sm-2 control-label"> Product Name:</label>
<div class="col-sm-10">
<form:input class="form-control" type="text" id="productName" name="product name" path="name" />
<br></div></div>
<div class="form-group">
<label class="col-sm-2 control-label"> Serial number:</label>
<div class="col-sm-10">
<form:input class="form-control" type="text" id="productSerial" name="serial number" path="serial" value=" " /></div></div>
<input type="submit" value="Submit">
</form:form>
controller
#RequestMapping(value = "/saveNewContact", method = RequestMethod.POST)
public ModelAndView saveContact(#ModelAttribute("userForm") Product product,
BindingResult result, Model model) {
System.out.println(product);
productService.saveOrUpdate(product);
return new ModelAndView("redirect:/");
}
Service
#Override
public void saveProduct(Product product) {
productDao.saveProduct(product);
}
DAO
the interface implementation has #Transactional(readOnly = false)
public void saveNewProduct(Product product) {
persist(product);
}

The problem was in the form just adding action="saveNewContact" fixed the issue.

Spring MVC Not Displaying Form Errors

Here's my controller
#RequestMapping(value = "/save",method = RequestMethod.POST)
public ModelAndView saveUserAccount(#ModelAttribute("account") UserAccountForm userAccount, BindingResult result){
AddUserValidator userValidator = new AddUserValidator();
userValidator.validate(userAccount,result);
boolean hasErrors = result.hasErrors();
if(hasErrors){
return render(ADD_USER_VIEW)
.addAttr("ACCOUNT_ROLES", Arrays.asList(AccountRole.values()))
.addAttr("TENANTS",tenantInfoService.getAll())
.addAttr("errors",result)
.addAttr("account",userAccount).toMav();
}
return render(ADD_USER_VIEW)
.addAttr("ACCOUNT_ROLES", Arrays.asList(AccountRole.values()))
.addAttr("TENANTS",tenantInfoService.getAll())
.addAttr("account",new UserAccountForm())
.toMav();
}
Here's the render library That I have created.
public class RenderMavBuilder {
private final ModelAndView mav;
public static RenderMavBuilder render(String viewname){
RenderMavBuilder target = new RenderMavBuilder(viewname);
return target;
}
public RenderMavBuilder addAttr(String attrName, Object value){
mav.addObject(attrName, value);
return this;
}
public RenderMavBuilder addAttr(Object value){
mav.addObject(value);
return this;
}
public RenderMavBuilder addAttrs(Map<String , ?> attrs){
mav.addAllObjects(attrs);
return this;
}
private RenderMavBuilder(String viewName){
this.mav = new ModelAndView(viewName);
}
public ModelAndView toMav(){
return mav;
}
}
Here's my validator
Here's my form.
<div class="col-md-6 centered">
<form:errors path="*" />
<form:form commandName="account" method="post" action="${pageContext.request.contextPath}/user/save">
<!-- Username -->
<div class="col-xs-12 form-group">
<label class="control-label">Username</label>
<form:input path="username" type="text" class="form-control" />
</div>
<!-- Password -->
<div class="col-xs-12 form-group">
<label class="control-label">Password</label>
<form:password path="password" class="form-control"/>
</div>
<!-- Password -->
<div class="col-xs-12 form-group">
<label class="control-label">Password</label>
<form:password path="retypedPassword" class="form-control"/>
</div>
<!-- First Name -->
<div class="col-xs-12 form-group">
<label class="control-label">First Name</label>
<form:input path="firstName" type="text" class="form-control"/>
</div>
<!-- First Name -->
<div class="col-xs-12 form-group">
<label class="control-label">Last Name</label>
<form:input path="lastName" type="text" class="form-control"/>
</div>
<!-- User Role -->
<div class="col-xs-12 form-group">
<label class="control-label">User Role</label>
<form:select path="accountRole" class="form-control">
<form:options items="${ACCOUNT_ROLES}"/>
</form:select>
</div>
<!-- Branch Designation -->
<div class="col-xs-12 form-group">
<label class="control-label">Designated Branch</label>
<select path="tenantId" items="${TENANTS}" class="form-control">
<c:forEach var="branch" items="${TENANTS}">
<option value="${branch.id}">${branch.tenantDescription}</option>
</c:forEach>
</select>
</div>
<!-- Button -->
<div class="col-md-12 form-group">
<button class="form-control btn btn-primary submit-button" type="submit">Save New User <i class="fa fa-check-square-o"></i></button>
</div>
</form:form>
On my controler the binding result has errors. however, the error is not being displayed on the view, what am I missing?

The problem is the way you are constructing your ModelAndView, you should use the Errors object to construct it. Use Errors.getModel() to obtain the underlying Map that represents the model and use that, next to the view name, to construct the ModelAndView.
Next to that for your other model attributes you should simply add #ModelAttribute annotated methods to retrieve those. I would also suggest adding a GET based method which you redirect to after successful submit.
Your helper class seems also rather pointless as doing it simply inside your controller would simplify your code (imho).
Your controller could look something along these lines.
#RequestMapping(value = "/save",method = RequestMethod.POST)
public ModelAndView saveUserAccount(#ModelAttribute("account") UserAccountForm userAccount, BindingResult result){
AddUserValidator userValidator = new AddUserValidator();
userValidator.validate(userAccount,result);
boolean hasErrors = result.hasErrors();
return new ModelAndView(hasErrors ? ADD_USER_VIEW, "redirect:/add", errors.getModel());
}
#RequestMapping(value="/add")
public String addUserAccount(Model model) {
model.addObject("account", new UserAccountForm());
return ADD_USER_VIEW;
}
#ModelAttribute
public void referenceData(Model model) {
model.addObject("ACCOUNT_ROLES", Arrays.asList(AccountRole.values()));
model.addObject("TENANTS",tenantInfoService.getAll());
}