Spring + thymeleaf Validanting integer error Neither BindingResult nor plain target object for bean name available as request attribute - spring

Question

I'm in the process of learning spring and thymeleaf and working on a timekeeping project.
For this I need to validate the number of hours an employee clocks in one day.
I used the tutorial in the spring documentation for this however i keep getting the following error
Neither BindingResult nor plain target object for bean name 'timetable' available as request attribute
Any ideas what I might be doing wrong?
Controller class
#RequestMapping(value="Timetable/AddToTimetable", method = RequestMethod.GET)
public String newUser(Model md) {
md.addAttribute("assignments", serv.findAll());
return "AddToTimetable";
}
#RequestMapping(value = "/createEntry", method = RequestMethod.POST)
public String create(#RequestParam("assignmentId") int assignmentId,
#RequestParam("date") #DateTimeFormat(pattern = "yyyy-MM-dd") Date date,
#RequestParam("hoursWorked") int hoursWorked,
#Valid Timetable timetable, BindingResult bindingResult,
Model md) {
timetable = new Timetable();
timetable.setAssignmentId(assignmentId);
timetable.setDate(date);
timetable.setHoursWorked(hoursWorked);
md.addAttribute("timetables", service.timetableAdd(timetable));
if (bindingResult.hasErrors()) {
return "AddToTimetable";
}
return "redirect:/Timetable";
}
Service class
public BigInteger timetableAdd(Timetable timetable){
KeyHolder keyHolder = new GeneratedKeyHolder();
String sql = "INSERT INTO timetables ( assignmentId, date, hoursWorked) VALUES ( ?, ?, ?)";
template.update(new PreparedStatementCreator() {
public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
PreparedStatement pst = con.prepareStatement(sql, new String[] {"id"});
pst.setInt(1, timetable.getAssignmentId());
pst.setDate(2, new java.sql.Date(timetable.getDate().getTime()));
pst.setInt(3, timetable.getHoursWorked());
return pst;
}
}, keyHolder);
return (BigInteger) keyHolder.getKey();
}
}
Model class
package ro.database.jdbcPontaj.model;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.util.Date;
public class Timetable {
private int timetableId;
private int assignmentId;
private Date date;
private String project;
#NotNull
#Min(0)
#Max(12)
private int hoursWorked;
public int getTimetableId() {
return timetableId;
}
public void setTimetableId(int timetableId) {
this.timetableId = timetableId;
}
public int getAssignmentId() {
return assignmentId;
}
public void setAssignmentId(int assignmentId) {
this.assignmentId = assignmentId;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public int getHoursWorked() {
return hoursWorked;
}
public void setHoursWorked(int hoursWorked) {
this.hoursWorked = hoursWorked;
}
public String getProject() {
return project;
}
public void setProject(String project) {
this.project = project;
}
public Timetable() {
}
public Timetable(int timetableId, String project, Date date, int hoursWorked) {
this.timetableId = timetableId;
this.project=project;
this.date = date;
this.hoursWorked = hoursWorked;
}
public Timetable(int timetableId, int assignmentId, Date date, int hoursWorked) {
this.timetableId = timetableId;
this.assignmentId = assignmentId;
this.date = date;
this.hoursWorked = hoursWorked;
}
}
Html
<form method="post" name="comment_form" id="comment_form" th:action="#{/createEntry}" th:object="${timetable}" role="form">
<p> Project</p><br>
<select name="assignmentId">
<option value="" th:each="assignment: ${assignments}" th:value="${assignment.assignmentId}" th:text="${assignment.assignmentId}"></option>
</select>
<p>Date</p> <br>
<input class="datepicker" type="text" name="date"><br>
<p>Number of hours</p>
<input type="text" name="hoursWorked" th:field="*{hoursWorked}"><br>
<p th:if="${#fields.hasErrors('hoursWorked')}" th:errors="*{hoursWorked}">Age Error</p>
<button type="submit" id="submit" class="btn btn-primary">Submit</button>
</form>
UPDATE:
Timetable (skipping bootstrap divs)
<div class="row">
<div class="col-md-10 title">
<h2>Timetable</h2>
</div>
<div class="col-md-2">
</div>
<div class="col-md-12">
<table class="table table-bordered">
<thead>
<tr>
<th>id</th>
<th>assignment</th>
<th>date</th>
<th>number of hours</th>
</tr>
</thead>
<tbody>
<tr th:each = "timetable: ${timetables}">
<td th:text="${timetable.timetableId}">45</td>
<td th:text="${timetable.project}">vasi</td>
<td th:text="${timetable.date}">1 ian</td>
<td th:text="${timetable.hoursWorked}">3000</td>
</tr>
</tbody>
</table>
Service method for Timetable
#Autowired
JdbcTemplate template;
public List<Timetable> findAll(String loginname) {
String sql = " SELECT timetables.timetableId, timetables.assignmentId, timetables.date, " +
"timetables.hoursWorked, users.username, projects.projectName AS project " +
"FROM timetables INNER join assignments on timetables.assignmentId = assignments.assignmentId " +
"INNER JOIN projects on assignments.projectId = projects.projectId " +
"INNER JOIN users on users.userId = assignments.userId where username= ?";
RowMapper<Timetable> rm = new RowMapper<Timetable>() {
#Override
public Timetable mapRow(ResultSet resultSet, int i) throws SQLException {
Timetable timetable = new Timetable(resultSet.getInt("timetableId"),
resultSet.getString("project"),
resultSet.getDate("date"),
resultSet.getInt("hoursWorked"));
return timetable;
}
};
return template.query(sql, rm, loginname);
}
The controller method for Timetable
#RequestMapping(value = {"/Timetable"}, method = RequestMethod.GET)
public String index(Model md){
org.springframework.security.core.Authentication auth = SecurityContextHolder.getContext().getAuthentication();
String loginname = auth.getName();
md.addAttribute("timetables", service.findAll(loginname));
return "Timetable";
}

Answer 1

If I understand correctly you have two html pages one that shows all the assignments and one that you enter the new entry.I think that get the error when there is a validation error in the new entry page.
Substitute these lines
if (bindingResult.hasErrors()) {
return "AddToTimetable";
}
with these ones
if (bindingResult.hasErrors()) {
return "newEntry";//replace the newentry with the html page that you enter the new entry
}
When there is an error, you should go to the page that you tried to enter the new entry and not in the page that has all the assignments.