Cannot submit a form with Materialize css - html

Question

I use Java EE with JSTL and Materialize css for my project.
When i try to submit a Materialize css form in a jsp file i get an error.
> com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
> Column 'name' cannot be null
Here is the form:
<div class="row">
<form class="col s12" action="update_comment" method="post">
<input type="hidden" name="comment_id" value="${comment.comment_id}" >
<div class="row">
<div class="input-field col s6">
<i class="material-icons prefix">account_circle</i>
<input disabled value="${comment.name}" id="icon_prefix" type="text" class="validate">
<label for="icon_prefix">Имя комментатора</label>
</div>
</div>
<div class="row">
<div class="input-field col s6">
<i class="material-icons prefix">mode_edit</i>
<textarea id="icon_prefix2" class="materialize-textarea">${comment.text}</textarea>
<label for="icon_prefix2">Отредактируйте комментарий</label>
</div>
</div>
<div>
<button class="btn waves-effect waves-light" type="submit" name="submit-button" id="submit-button">Подтвердить
<i class="material-icons right">send</i>
</button>
<a id="buttonCancel" class="waves-effect waves-light red btn">
<i class="material-icons right">close</i>Отмена</a>
</div>
</form>
</div>
But when i use normal html code like this it works:
<div>
<form action="update_comment" method="post" id="commentForm">
<table class="form">
<input type="hidden" name="comment_id" value="${comment.comment_id}">
<tr>
<td align="right">Category name:</td>
<td align="left"><input type="text" id="name" name="name" size="20" value="${comment.name}" /></td>
</tr>
<tr>
<td align="right">text:</td>
<td align="left"><input type="text" id="text" name="text" size="20" value="${comment.text}" /></td>
</tr>
<tr><td> </td></tr>
<tr>
<td colspan="2" align="center">
<button type="submit">Save</button>
<button id="buttonCancel" >Cancel</button>
</td>
</tr>
</table>
</form>
</div>
What is my mistake? Thanks