src/main/webapp/WEB-INF/jsp/user-form.jsp

<%--
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Copyright 2021 Mike Becker. All rights reserved.

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<%@page pageEncoding="UTF-8" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

<jsp:useBean id="viewmodel" type="de.uapcore.lightpit.viewmodel.UserEditView" scope="request"/>
<c:set var="user" scope="page" value="${viewmodel.user}" />

<form action="./users/-/commit" method="post">
    <table class="formtable">
        <colgroup>
            <col>
            <col style="width: 50ch">
        </colgroup>
        <tbody>
        <tr>
            <th><fmt:message key="username"/></th>
            <td><input name="username" type="text" maxlength="50" required value="<c:out value="${user.username}"/>"
                       <c:if test="${user.id ge 0}">readonly</c:if> /></td>
        </tr>
        <tr>
            <th><fmt:message key="user.givenname"/></th>
            <td><input name="givenname" type="text" maxlength="50" value="<c:out value="${user.givenname}"/>" /></td>
        </tr>
        <tr>
            <th><fmt:message key="user.lastname"/></th>
            <td><input name="lastname" type="text" maxlength="50" value="<c:out value="${user.lastname}"/>" /></td>
        </tr>
        <tr>
            <th><fmt:message key="user.mail"/></th>
            <td><input name="mail" type="email" maxlength="50" value="<c:out value="${user.mail}"/>" /></td>
        </tr>
        </tbody>
        <tfoot>
        <c:if test="${not empty viewmodel.errorText}">
        <tr>
            <td colspan="2">
                <div class="error-box">
                    <fmt:message key="${viewmodel.errorText}"/>
                </div>
            </td>
        </tr>
        </c:if>
        <tr>
            <td colspan="2">
                <input type="hidden" name="userid" value="${user.id}"/>
                <a href="./users/" class="button">
                    <fmt:message key="button.cancel"/>
                </a>
                <button type="submit"><fmt:message key="button.okay"/></button>
            </td>
        </tr>
        </tfoot>
    </table>
</form>