/**
 * Copyright 2012 Google Inc. All Rights Reserved. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fr.bodul.demange;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class DisplayServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException, ServletException {

        GenericDao<Character> dao = new GenericDao<>(Character.class);
        dao.getEntities();
        req.setAttribute("characters", dao.getEntities());

        req.getRequestDispatcher("/display.jsp").forward(req, resp);
    }
}

/**
 * Copyright 2012 Google Inc. All Rights Reserved. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fr.bodul.demange;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class DisplayServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException, ServletException {

        GenericDao<Character> dao = new GenericDao<>(Character.class);
        List<Character> characterList = dao.getEntities();
        Collections.sort(characterList, new Comparator<Character>() {
            @Override
            public int compare(Character character, Character character2) {
                return character.getActivationDate().compareTo(character2.getActivationDate());
            }
        });
        req.setAttribute("characters", characterList);
        req.getRequestDispatcher("/display.jsp").forward(req, resp);
    }
}

Add sorting with the Activation Date