I have a SpringBoot-MVC Java application with JPA/Hibernate, using a H2 database to store data and I’m trying to read and change lines of this database through web browser. I had success with the reading, but the edit page’s form with thymeleaf does not send the object I alterated to controller class.
The formulary:
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<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"><head><meta charset="UTF-8" /><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><meta name="viewport" content="width=device-width" /><title>Cadastro de Clientes</title><link href="/webjars/bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet"></link><script src="/webjars/jquery/3.5.1/jquery.min.js"></script><script src="/webjars/bootstrap/4.5.0/js/bootstrap.min.js"></script></head><body> <div class="panel panel-default"> <div class="panel-heading"> <strong>Edicao de Clientes</strong> </div> <div class="panel-body"> <form class="form-horizontal" th:object="${customer}" th:action="@{/save}" method="post" style="margin: 10px"> <div class="form-group"> <fieldset> <div class="form-group row"> <div class="alert alert-danger" th:if="${#fields.hasAnyErrors()}"> <div th:each="detailedError : ${#fields.detailedErrors()}"> <span th:text="${detailedError.message}"></span> </div> </div> </div> <div class="form-group row"> <div class="col-md-1"> <input type="hidden" class="form-control input-sm" th:field="*{id}" readonly="readonly" style="display: none;" /> </div> <div class="col-md-1"> <label>CÓD. DO CLIENTE</label> <input type="text" class="form-control input-sm" th:field="*{customerId}" readonly="readonly" /> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('companyName')}? 'has-error'"> <label>RAZAO SOCIAL</label> <input type="text" class="form-control input-sm" th:field="*{companyName}" autofocus="autofocus" placeholder="Informe o texto" maxlength="50" /> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('tradeName')}? 'has-error'"> <label>NOME FANTASIA</label> <input type="text" class="form-control input-sm" th:field="*{tradeName}" maxlength="150" placeholder="Informe o texto" /> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('sectorId')}? 'has-error'"> <label>SETOR</label> <input type="text" class="form-control input-sm" th:field="*{sectorId}" /> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('neighborhood')}? 'has-error'"> <label>BAIRRO</label> <textarea class="form-control input-sm" th:field="*{neighborhood}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('place')}? 'has-error'"> <label>LOGRADOURO</label> <textarea class="form-control input-sm" th:field="*{place}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('neighborhood')}? 'has-error'"> <label>NUMERO</label> <textarea class="form-control input-sm" th:field="*{placeId}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('city')}? 'has-error'"> <label>CIDADE</label> <textarea class="form-control input-sm" th:field="*{city}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('visitDay')}? 'has-error'"> <label>DIA DE VISITA</label> <textarea class="form-control input-sm" th:field="*{visitDay}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('region')}? 'has-error'"> <label>REGIAO</label> <textarea class="form-control input-sm" th:field="*{region}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('latitude')}? 'has-error'"> <label>LATITUDE</label> <textarea class="form-control input-sm" th:field="*{latitude}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <div class="col-md-2" th:classappend="${#fields.hasErrors('longitude')}? 'has-error'"> <label>LONGITUDE</label> <textarea class="form-control input-sm" th:field="*{longitude}" placeholder="Informe o texto"></textarea> </div> </div> <div class="form-group row"> <button type="submit" class="btn btn-sm btn-primary">Salvar</button> <a th:href="@{/}" class="btn btn-sm btn-default">Cancelar</a> </div> </fieldset> </div> </form> </div> </div></body></html>The method that should receive the object of formulary:
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package com.br.aloi.planner.controller;import javax.validation.Valid;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.validation.BindingResult;import org.springframework.web.bind.annotation.DeleteMapping;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.servlet.ModelAndView;import com.br.aloi.planner.model.Customer;import com.br.aloi.planner.service.CustomerService;@Controllerpublic class CustomerController { @Autowired private CustomerService service;() @PostMapping("/save") public ModelAndView save(@Valid Customer customer, BindingResult result) { if (result.hasErrors()) { return edit(customer.getId()); } service.save(customer); return findAll(); }}The objects is returning null to the save method on controller class. Otherwise when I select a line of the database in browser and click on ‘edit’, the edit page open for edition with the attributes of objects created just perfectly.
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Answer
Before demanding an object from Thymeleaf you have to pass the object via your model for Thymeleaf to have it.
Add the following to your controller method:
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@ModelAttribute("customer")public Customer thisPartCanBeCalledWhatever() { return new Customer(); }Make sure Customer class has getters, setters and default constructor.