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Spring + Thymeleaf form validation error not displaying

 
Greenhorn
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Error: org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "watchlistItemForm" - line 47, col 26)

Please help. I have spent hours troubleshooting and googling.

controller:




watchlistItemForm.html



<html xmlns:th="http://www.thymeleaf.org">
  <head>
        <meta charset = "utf-8">
        <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
        <link rel = "stylesheet" href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
        <title>Watchlist App</title>
     </head>
 <body>
    <div class = "container">
      <nav class = "navbar navbar-expand-sm navbar-dark bg-secondary">
          <a class = "navbar-brand" href = "homepage-static.html">Watchlist App</a>
          <button class = "navbar-toggler" type = "button" data-toggle = "collapse"
             data-target = "#navbarSupportedContent"
             aria-controls = "navbarSupportedContent" aria-expanded = "false"
             aria-label = "Toggle navigation">

             <span class = "navbar-toggler-icon"></span>
          </button>

          <div class = "collapse navbar-collapse" id = "navbarSupportedContent">
             <ul class = "navbar-nav mr-auto">
                <li class = "nav-item">
                   <a class = "nav-link" href = "/">Home</a>
                </li>
                <li class = "nav-item">
                   <a class = "nav-link" href = "watchlist">Watchlist</a>
                </li>
                <li class = "nav-item active">
                   <a class = "nav-link" href = "watchlistItemForm">Submit an item</a>
                </li>
             </ul>

          </div>
      </nav>        
       <form action="#" th:action="@{/watchlistItemForm}" th:object="${commandObj}" method="post" >
          <h2 class = "mt-4">Submit an item</h2>
          <hr/>
          <!-- Form levels error messages here -->
          <div class = "form-group row ">
             <div class="col-sm-8">
                  <span class="text-danger" > </span>      
              </div>
          </div>
          <div class = "form-group row ">
             <label for = "title" class = "col-sm-2 col-form-label">Title</label>
             <div class = "col-sm-4">
                <input th:field="*{title}" type = "text" class = "form-control" placeholder = "Mandatory">
             </div>
             <div class="col-sm-4">
                <span th:if="${#fields.hasErrors('title')}" th:errors="*{title}">title Error</span>

             </div>
          </div>

          <div class = "form-group row ">
             <label for = "rating" class = "col-sm-2 col-form-label mr-0">Rating</label>
             <div class = "col-sm-4">
                <input type = "text" th:field = "*{rating}" class = "form-control" placeholder = "5.0 < Number < 10.0">
             </div>
             <div class="col-sm-4">
                  <span class="text-danger"> </span>      
              </div>
          </div>

          <div class = "form-group row ">
             <label for = "priority" class = "col-sm-2 col-form-label mr-0">Priority</label>
             <div class = "col-sm-4">
                <input type = "text" th:field = "*{priority}" class = "form-control" placeholder = "Low|Medium|High">
             </div>
             <div class="col-sm-4">
                  <span class="text-danger"> </span>      
              </div>
          </div>

          <div class = "form-group row">
              <label for = "comments" class = "col-sm-2 col-form-label">Comments</label>
             <div class = "col-sm-4">
                <textarea th:field="*{comment}" class = "form-control" rows = "3" placeholder = "Max. 50 chars"></textarea>
             </div>
             <div class="col-sm-4">
                <span th:if="${#fields.hasErrors('comment')}" th:errors="*{comment}">Comment Error</span>
             </div>
          </div>
          <input type="hidden" th:field="*{id}" />
          <div class = "form-group row">
             <div class = "col-sm-10">
                <button type = "submit" class = "btn btn-primary">Submit</button>
             </div>            
          </div>

       </form>
    </div>

    <script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js"> </script>
    <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" > </script>
    <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" > </script>
 </body>
  </html>


Model Class



 
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