Spring jsp Failed to Convert value of type 'java.lang.String' to required type 'int'

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Hello guys I have the following error when I try to delete something from my table 

WARNING: Failed to bind request element: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: ""

I have a button that should pass the id of the selected line to the value of the Hidden field in the modal to confirm the deletion follows below:

<table class="table">
        <tr>
            <th>Nome</th>
            <th>Endereço</th>
            <th>Vagas</th>
            <th>Preço</th>


        </tr>
        <c:forEach items="${estacionamentos }" var="e">
            <tr>
                <td>${e.nome }</td>
                <td>${e.endereco }</td>
                <td>${e.vagas }</td>
                <td>${e.preco }</td>

                <td>
                    <c:url value="/estacionamento/editar/${e.codigo }" var="link"/>
                    <a href="${link}" class="btn btn-primary btn-sm">Editar</a>

                    <button  onclick="codigo.value = ${e.codigo}" type="button"
                    class="btn btn-danger btn-sm" data-toggle="modal" data-target="#excluirModal">
                        Excluir
                    </button>
                </td>
            </tr>
        </c:forEach>
    </table>

modal:

    <!-- Modal -->
<div class="modal fade" id="excluirModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Confirmação</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Realmente deseja excluir o estacionamento?
      </div>
      <div class="modal-footer">
        <c:url value="/estacionamento/excluir/" var="action"/>
        <form action="${action }" method="post">
            <input type="hidden" name="codigo" id="codigo">
            <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancelar</button>
            <button type="submit" class="btn btn-danger">Excluir</button>
        </form>
      </div>
    </div>
  </div>
</div>

When instead of Hidden I use a text or number field and pass an id manually the deletion occurs normally, I wonder if I’m using the onclick event in the correct way or if it’s another mistake I’m making.

java jsp modal spring-mvc

1 answer

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All indicates that the error is in the code passage to modal.

Try it this way:

<table class="table">
    <tr>
        <th>Nome</th>
        <th>Endereço</th>
        <th>Vagas</th>
        <th>Preço</th>


    </tr>
    <c:forEach items="${estacionamentos }" var="e">
        <tr>
            <td>${e.nome }</td>
            <td>${e.endereco }</td>
            <td>${e.vagas }</td>
            <td>${e.preco }</td>

            <td>
                <c:url value="/estacionamento/editar/${e.codigo }" var="link"/>
                <a href="${link}" class="btn btn-primary btn-sm">Editar</a>

                <button  onclick="passValueToModal(${e.codigo})" type="button"
                class="btn btn-danger btn-sm" data-toggle="modal" data-target="#excluirModal">
                    Excluir
                </button>
            </td>
        </tr>
    </c:forEach>
</table>

  //Poe isso dentro de <head></head> ou após o </jsp>
    <script>
    function passValueToModal(codigoSelecionado) {
        document.getElementById("codigo").value=codigoSelecionado;
    }    
</script>

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