Controller returns Java.lang.stackoverflow error when calling from ajax.
My Ajax function is like this.
$.ajax({
url: '${pageContext.servletContext.contextPath}/exam/test',
type: 'POST',
data: 'examName='+examName,
success: function(response) {
alert(response);
}
});
Controller
@RequestMapping(value = "/exam/test", method = RequestMethod.POST)
public @ResponseBody List<SchoolExam> examsTest(@ModelAttribute(value = "examName") String examName, BindingResult result, WebRequest webRequest, ModelMap map, Principal principal) {
User loggedUser = userService.getUserByUserName(principal.getName());
***********************
Some code here
***********************
List<SchoolExam> schoolExams = new ArrayList<SchoolExam>();
for (School school : schools) {
if (student) {
Set<Student> students = school.getStudents();
for(Student std : students) {
if (std != null && !std.isEmpty()) {
schoolExams.add(new SchoolExam(std, true));
}
}
}
if (teacher) {
Set<Teacher> teachers = school.getEvents();
for (Teacher tchr : teachers) {
if (loggedUser.equals(tchr.getOwner())) {
schoolExams.add(new SchoolExam(tchr, true));
}
}
}
if (exam) {
Set<Exam> exams = school.getCampaigns();
for (Exam exam1 : exams) {
if (loggedUser.equals(exam1.getOwner())) {
schoolExams.add(new SchoolExam(exam1, true));
}
}
}
}
return schoolExams;
}
SchoolExam
public SchoolExam(Object obj, boolean editable) {
this.editable = editable;
if (obj instanceof Student) {
Student student = (Student) obj;
this.id = student.getId();
this.name = student.getName();
this.type = Constants.Student;
this.obj = student; // <-- This is causing issue here
}
if (obj instanceof Teacher) {
Teacher teacher = (Teacher) obj;
this.id = teacher.getId();
this.name = teacher.getName();
this.type = Constants.Teacher;
this.obj = teacher; // <-- This is causing issue here
}
if (obj instanceof Exam) {
Exam exam = (Exam) obj;
this.id = exam.getId();
this.name = exam.getName();
this.type = Constants.Exam;
this.obj = exam; // <-- This is causing issue here
}
}
Issue:
This is working fine when a form is submit then I can use all data by running foreach loop in jsp but when I tried to return list in my function then ajax work successfully and it also return me response
response in ajax
[
{
"id":"2123244",
"name":"UK School",
"type":"exam",
"editable":true,
"obj":
{
"id":"2123244",
"authorizationRequired":false,
"owner":
{
"id":"5676764554",
"company":
{
"id":"55435435345",
"name":"SchoolTest Software",
"enabled":true,
"size":3,
"sector":null,
"phone":"1231231232",
"schoolFees":5000,
"location":"US",
"users":
[
{
"id":"5676764554",
"company": // <-- Start Repeating here
{
"id":"55435435345",
"name":"SchoolTest Software",
"enabled":true,
"size":3,
"sector":null,
"phone":"1231231232",
"schoolFees":5000,
"location":"US",
"users":
[
{
"id":"5676764554",
"company": // <-- Repeating again
{
"id":"55435435345",
"name":"SchoolTest Software",
"enabled":true,
"size":3,
"sector":null,
"phone":"1231231232",
"schoolFees":5000,
"location":"US",
"users":
[
{
"id":"5676764554",
"company":// <-- It keeps repeating it self
but when I tried to print list value in controller it's only printing one value.
e.g:
for (SchoolExam schoolExam : schoolExams) {
System.out.println("Name: " + schoolExam.getName());
System.out.println("ID: " + schoolExam.getId());
Exam exam = (Exam) schoolExam.getObj();
System.out.println("Exam Name: " + exam.getName());
}
Output:
Name: UK School
ID: 2123244
Exam Name: UK School
Note:
If I comment obj line then everything works fine for me.
e.g:
this.obj = student;
this.obj = teacher;
this.obj = exam;
But I need to use this to get data as It contain data for different table.
Please find this file for error log that I'm getting in console.
So, What I'm doing wrong which cause this issue or I need to use any other way to prevent this issue.
Any suggestion or link will be helpful.
