I am trying to get courseList from a JSP page by binding with the student object in Spring. Below is my Student class. However even if I check the checkboxes, the size of the ArrayList is 0. Can you please tell me why this is happening?
Thanks.
P.S.
This is the error I am getting:
[Field error in object 'student' on field 'courseList': rejected value
[mad.nurseryapplication.model.Course@1c92233b,mad.nurseryapplication.model.Course@3e470524];
codes [typeMismatch.student.courseList,typeMismatch.courseList,typeMismatch.java.util.List,typeMismatch];
arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [student.courseList,courseList]; arguments []; default message [courseList]];
default message [Failed to convert property value of type 'java.lang.String[]' to required type 'java.util.List' for property 'courseList'
This is a part of student class. it has all the getters and setters correctly.
@Table(name="student")
public class Student {
@Id @GeneratedValue(strategy=GenerationType.AUTO)
private long id;
@Column(name="first_name")
private String firstName;
@Column(name="last_name")
private String lastName;
private String grade;
@Column(name="home_number")
private String homeNumber;
@Column(name="home_address")
@Lob
private String homeAddress;
@Column(name="date_of_registration")
@Temporal(TemporalType.DATE)
private Date dateOfRegistration;
@ManyToMany
@JoinTable(name="course_student",joinColumns=@JoinColumn(name="student_id"),inverseJoinColumns=@JoinColumn(name="course_id"))
private List<Course> courseList = new ArrayList<Course>();
This is my jsp page code.
<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Food List</title>
</head>
<body>
${message}
<br /> ${operation}
<br /> Please Select Subjects for the Student ${student.firstName}
<br /> Student Id is ${student.id}
<br />
<form:form method="post" action="${action}" modelAttribute="student">
<table>
<tr>
<th>enroll</th>
<th>Subject</th>
</tr>
<form:hidden path="id" value="${student.id}"/>
<c:forEach items="${avacourses}" var="course" varStatus="status">
<tr>
<td><form:checkbox path="courseList" value="${course}" /></td>
<td>${course.courseName}</td>
</tr>
</c:forEach>
</table>
<br />
<input type="submit" value="enroll" />
</form:form>
</body>
</html>
Below is my controller code that handle it.
@RequestMapping("/addstudent")
public ModelAndView addStudent(@ModelAttribute("student")Student student,BindingResult result){
student = studentService.addStudent(student);
Collection<Course> availableCourses = courseService.getAvailableCourses(student.getGrade());
ModelAndView mav = new ModelAndView();
mav.setViewName("/course/courselist");
mav.addObject("operation", "Enroll the courses to the student");
mav.addObject("action", "enroll.html");
mav.addObject("student", student);
mav.addObject("avacourses", availableCourses);
return mav;
}
@RequestMapping("/enroll")
public ModelAndView ModelAndView(@ModelAttribute("student")Student student, BindingResult result){
System.out.println(student.getId());
System.out.println(student.getCourseList().size());
ModelAndView mav = new ModelAndView("/student/student","command",new Student());
mav.addObject("operation", "Add a new Student");
return mav;
}
Have you tried using the<form:checkboxes>tag instead?Also, take a look at: Spring MVC usage of form:checkbox to bind data and Spring Binding List<Object> to Form:checkboxes.
EDIT: just realised it will break your labels – being populated by the forEach loop.