Index: lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/LearningController.java
===================================================================
diff -u -r3ee06bc1b00b1673399c1871a73cfa1d8ec2c0db -r8f2ea9ad369a3ffb1e3d087429357f8ddd2959ba
--- lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/LearningController.java	(.../LearningController.java)	(revision 3ee06bc1b00b1673399c1871a73cfa1d8ec2c0db)
+++ lams_tool_leader/src/java/org/lamsfoundation/lams/tool/leaderselection/web/controller/LearningController.java	(.../LearningController.java)	(revision 8f2ea9ad369a3ffb1e3d087429357f8ddd2959ba)
@@ -43,8 +43,10 @@
 import org.lamsfoundation.lams.web.session.SessionManager;
 import org.lamsfoundation.lams.web.util.AttributeNames;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
 
 @Controller
 @RequestMapping("/learning")
@@ -102,7 +104,8 @@
 	// checks whether to display dialog prompting to become a leader
 	boolean isSelectLeaderActive = (groupLeader == null) && !user.isFinishedActivity() && !mode.isTeacher();
 	request.setAttribute("isSelectLeaderActive", isSelectLeaderActive);
-	request.setAttribute(AttributeNames.ATTR_IS_LAST_ACTIVITY, leaderselectionService.isLastActivity(toolSessionId));
+	request.setAttribute(AttributeNames.ATTR_IS_LAST_ACTIVITY,
+		leaderselectionService.isLastActivity(toolSessionId));
 	return "pages/learning/leaderselection";
     }
 
@@ -112,6 +115,7 @@
      * @throws JSONException
      */
     @RequestMapping(value = "/becomeLeader")
+    @ResponseStatus(code = HttpStatus.OK)
     public void becomeLeader(HttpServletRequest request) throws IOException {
 	Long toolSessionId = WebUtil.readLongParam(request, AttributeNames.PARAM_TOOL_SESSION_ID);
 	LeaderselectionSession session = leaderselectionService.getSessionBySessionId(toolSessionId);
Index: lams_tool_leader/web/pages/learning/leaderselection.jsp
===================================================================
diff -u -r639c5ec2598f0c148ceeb7d4bc8d7e9033dfccf3 -r8f2ea9ad369a3ffb1e3d087429357f8ddd2959ba
--- lams_tool_leader/web/pages/learning/leaderselection.jsp	(.../leaderselection.jsp)	(revision 639c5ec2598f0c148ceeb7d4bc8d7e9033dfccf3)
+++ lams_tool_leader/web/pages/learning/leaderselection.jsp	(.../leaderselection.jsp)	(revision 8f2ea9ad369a3ffb1e3d087429357f8ddd2959ba)
@@ -38,7 +38,8 @@
 			    	async: false,
 			        url: '<c:url value="/learning/becomeLeader.do?toolSessionID=${toolSessionID}"/>',
 			        type: 'post',
-			        success: function (json) {
+			        dataType : 'text',
+			        success: function () {
 			          	location.reload();
 			        }
 			   	});