jsonify authentication success response

web/src/main/java/lcsb/mapviewer/web/config/AuthenticationSuccessHandlerImpl.java

@@ -8,6 +8,7 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -56,9 +57,11 @@ public class AuthenticationSuccessHandlerImpl implements AuthenticationSuccessHa
       result.put("token", request.getSession().getId());
       result.put("login", user.getLogin());
       request.getSession().setMaxInactiveInterval(Configuration.getSessionLength());
+
+      String json = new ObjectMapper().writeValueAsString(result);
       
       response.setContentType("application/json");
-      response.getWriter().print(result);
+      response.getWriter().print(json);
 
     }