title: Exception evaluating SpringEL expression: "date_a" on code that works on 3 other pages
body: <p>I have problem with this code...</p>
  
  <pre><code>&lt;form action="#" th:action="@{'/portfolio/' + ${portfolios.getId()} + '/old' }" th:object="${Date}" method="post"&gt;
  &lt;table&gt;
      &lt;tr&gt;
          &lt;td&gt;From: &lt;input type="date" th:value="*{date_a}" th:field="*{date_a}" /&gt;&lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
          &lt;td&gt;&lt;input type="submit" th:onclick="'javascript:loading()'" value="Change day" /&gt;&lt;/td&gt;
      &lt;/tr&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p></p>
  
  <p>I really dont get why this is not working...
  Its copy paste from other pages, which there are 3 of, and all the others are okey with this same snippet. But here i get error.</p>
  
  <pre><code>org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "date_a" (template: "portfolio" - line 12, col 42)
  </code></pre>
  
  <p>i pass an empty object on previous page with</p>
  
  <pre><code>ThymeDate date = new ThymeDate();
  modelAndView.addObject("Date", date);
  </code></pre>
  
  <p>EDIT:</p>
  
  <p>ThymeDate</p>
  
  <pre><code>@Entity
   @Table(name = "dto_thyme")
   public class ThymeDate implements Serializable {
  
  @Id
  @GeneratedValue
  long id;
  
  @DateTimeFormat(pattern = "yyyy-MM-dd")
  private LocalDate date_a;
  
  @DateTimeFormat(pattern = "yyyy-MM-dd")
  private LocalDate date_b;
  
  public long getId() {
      return id;
  }
  
  public void setId(long id) {
      this.id = id;
  }
  
  public LocalDate getDate_a() {
      return date_a;
  }
  
  public void setDate_a(LocalDate date_a) {
      this.date_a = date_a;
  }
  
  public LocalDate getDate_b() {
      return date_b;
  }
  
  public void setDate_b(LocalDate date_b) {
      this.date_b = date_b;
  }
  
  public ThymeDate() {
  
  }
  
  public ThymeDate(LocalDate date_a, LocalDate date_b) {
  
      this.date_a = date_a;
      this.date_b = date_b;
  }
  </code></pre>
  
  <p>}</p>