I cannot pass the message to my jsp - spring

Question

my controller
#RequestMapping("/")
public String loadHome(#RequestParam(value="tab",defaultValue="pending_users") String tab,Model model) {
UsersManager um = new UsersManager();
TagsManager tm = new TagsManager();
if(tab.equals("pending_users"))
model.addAttribute("pending_users",um.getPendingUsers(""));
else if(tab.equals("registered_users"))
model.addAttribute("registered_users",ForumUserUtility.sortPointEarned(um.getUsers(0,um.getNoOfUsers(""),"")));
else if(tab.equals("suspended_users"))
model.addAttribute("suspended_users",ForumUserUtility.sortPointEarned(um.getSuspendedUsers(0,um.getNoOfUsers(""),"")));
else if(tab.equals("tags"))
model.addAttribute("tags",tm.getTagsPopular(""));
else if(tab.equals("admins")){
model.addAttribute("admins",ForumUserUtility.sortPointEarned(um.getAdminList(0,um.getNoOfUsers(""),"")));
}
model.addAttribute("tab",tab);
return "admin_view";
}
#RequestMapping("/DeleteAdmin")
public String deleteAdmin(#RequestParam(value="user_id") String userId, Model model){
UsersManager um = new UsersManager();
um.deleteAdmin(Integer.parseInt(userId));
model.addAttribute("messageAdmin", "Admin Successfully Deleted");
return loadHome("admins", model);
}
my jsp
<c:if test="${loggedInUserType == 'master_admin' }">
<c:if test="${tab == 'admins'}">
${messageAdmin }
<div>
<input onkeyup="showAdmins(this.value)" placeholder="Search Admin" type="text"/>
<div id="admin_box">
<c:if test="${not empty admins}">
<table class='table table-bordered' id="admins">
<tr>
<th colspan='6' style='text-align:center'>Admins</th>
</tr>
<tr>
<th style='text-align:center'>Username</th>
<th style='text-align:center'>First Name</th>
<th style='text-align:center'>Last Name</th>
<th style='text-align:center'>Email</th>
<th style='text-align:center' colspan="2">Action</th>
</tr>
<c:forEach var="user" items="${admins}">
<tr>
<td>${user.username}</td>
<td>${user.firstName}</td>
<td>${user.lastName}</td>
<td>${user.emailAddress}</td>
<td>
<a href="" onclick="return suspendUser(${user.userId})">
Suspend
</a>
</td>
<td>
<a href="" onclick="return deleteAdmin(${user.userId})">
Delete Admin
</a>
</td>
</tr>
</c:forEach>
</table>
</c:if>
</div>
<c:if test="${empty admins}">
<h1>No Suspended User</h1>
</c:if>
</div>
</c:if>
</c:if>
i need to send a message in my jsp notifying the user that the admin was already deleted but the ${messageAdmin} cannot be seen in my view. what do you think is wrong in my code? here is my jsp too.