Data not populating on page after processing post request - spring

Question

it shows data when get request is send properly but when i save data with post requset then again the page is rendered data is not coming on page
This is my controller code
#RequestMapping(value = "/incident", method = RequestMethod.GET)
public String add_incident(Model model,HttpSession session) {
try{
List<AddIncident> fetchincident = incService.fetchIncident();
String user_id = ""+session.getAttribute("session");
List<AddIncident> fetchuserincident = incService.fetchuserincident(user_id);
//group work
User user = new User();
model.addAttribute("user", user);
List<User> fetchListByUsername = userService.findListByUserName(user_id);
String department = fetchListByUsername.get(0).getDepartment();
List<AddIncident> fetchgroupincident = incService.fetchgroupincident(department);
System.out.println(fetchgroupincident.get(0).getAssignTo());
System.out.println(fetchgroupincident.get(0).getSeverity());
model.addAttribute("fetchincident", fetchincident);
model.addAttribute("fetchgroupincident", fetchgroupincident);
model.addAttribute("fetchuserincident", fetchuserincident);
}catch(Exception e){
e.printStackTrace(); }
AddIncident incident = new AddIncident();
model.addAttribute("incident", incident);
return "incident";
}
#RequestMapping(value = "/incident", method = RequestMethod.POST)
public String add_incident(
#Valid #ModelAttribute("incident") AddIncident incident,
BindingResult result, Model model,HttpSession session) {
if (result.hasErrors()) {
return "incident";
} else {
User user=new User();
System.out.println(""+session.getAttribute("session"));
String user_id = ""+session.getAttribute("session");
System.out.println(user_id);
List<User> fetchListByUsername = userService.findListByUserName(user_id);
String department = fetchListByUsername.get(0).getDepartment();
System.out.println(department);
try{
List<User> fetchgroupuser = userService.findListByGroup(department);
ArrayList<String> email=new ArrayList<String>();
System.out.println(email);
for(User use:fetchgroupuser){
email.add(use.getEmail());
}
String[] to = new String[email.size()];
to = email.toArray(to);
System.out.println(to);
/*new String[]{"irasoftwares6#gmail.com","bluemagictest#gmail.com"};*/
String from = "Anurag.yv19#gmail.com";
String sub= "Incident Management System";
String msgBody="New Incident created";
incService.save(incident);
emailService.sendEmail(to , from, sub, msgBody);
}catch(ArrayIndexOutOfBoundsException e){e.printStackTrace();}
incident_logger.log(INCIDENT, incident.getRef_id()+" \n Assigned to :"+session.getAttribute("session"));
model.addAttribute("message", "Saved incident details");
return "incident";
}
}
my jsp code
<div class="table-responsive" id="inc-table" style="min-height: 280px;">
<form action="" method="get">
<div class="input-group">
<!-- USE TWITTER TYPEAHEAD JSON WITH API TO SEARCH -->
<input class="form-control" id="system-search" name="q" placeholder="Search for" required>
<span class="input-group-btn">
<button type="submit" class="btn btn-default"><i class="glyphicon glyphicon-search"></i></button>
</span>
</div>
</form>
<table class="table table-list-search table-bordered table-stripped table-hover">
<thead>
<tr>
<th>Ref. No.</th>
<th>Created</th>
<th>Severity</th>
<th>State</th>
<th>Assigned</th>
<th>Est</th>
<th>Description</th>
<th>Location</th>
<th>Config-item</th>
<th>Symptom Code</th>
<th>Closure Code</th>
<th>Submitted BY</th>
</tr>
</thead>
<tbody>
<c:forEach var="fetchuserincident" items="${fetchuserincident}">
<tr>
<td id="1" class="click" ><a href=""/>${fetchuserincident.ref_id}</td>
<td>${fetchuserincident.created}</td>
<td>${fetchuserincident.severity}</td>
<td>${fetchuserincident.state}</td>
<td>${fetchuserincident.assignTo}</td>
<td>${fetchuserincident.escalation}</td>
<td>${fetchuserincident.description}</td>
<td>${fetchuserincident.location}</td>
<td>${fetchuserincident.config_Item}</td>
<td>${fetchuserincident.symptom_code}</td>
<td>${fetchuserincident.closure_code}</td>
<td>${fetchuserincident.submittedby}</td>
<td> <button id="editbtn" class="fa fa-pencil">Edit</button></td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
<hr>
<br>
My Group Work
Ref. No.
Created
Severity
State
Assigned
Est
Description
Location
Config-item
Symptom Code
Closure Code
Submitted BY
${fetchgroupincident.ref_id}
${fetchgroupincident.created}
${fetchgroupincident.severity}
${fetchgroupincident.state}
${fetchgroupincident.assignTo}
${fetchgroupincident.escalation}
${fetchgroupincident.description}
${fetchgroupincident.location}
${fetchgroupincident.config_Item}
${fetchgroupincident.symptom_code}
${fetchgroupincident.closure_code}
${fetchgroupincident.submittedby}
Edit