AppWarpS2 WP8 Quiz Tutorial demo server exception

Question

Many thanks for your reply, I'm getting a null pointer at the server end when both users logout on the quiz demo and not sure why?

RE: http://forum.shephertz.com/?qa=3772/appwarps2-wp8-quiz-tutorial-demo-connection-fail

Please see console print below...

Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre8\li
b\tools.jar
Buildfile: C:\Users\Trip Admin\Desktop\Submissions\Verses Mode\Quiz_WindowsPhone
\Quiz_WindowsPhone\QuizServer\warp.xml
     [echo] Using Java version 1.8.

clean:
   [delete] Deleting directory C:\Users\Trip Admin\Desktop\Submissions\Verses Mo
de\Quiz_WindowsPhone\Quiz_WindowsPhone\QuizServer\build

compile:
    [mkdir] Created dir: C:\Users\Trip Admin\Desktop\Submissions\Verses Mode\Qui
z_WindowsPhone\Quiz_WindowsPhone\QuizServer\build\classes
    [javac] Compiling 21 source files to C:\Users\Trip Admin\Desktop\Submissions
\Verses Mode\Quiz_WindowsPhone\Quiz_WindowsPhone\QuizServer\build\classes
    [javac] warning: [options] bootstrap class path not set in conjunction with
-source 1.7
    [javac] 1 warning

jar:
    [mkdir] Created dir: C:\Users\Trip Admin\Desktop\Submissions\Verses Mode\Qui
z_WindowsPhone\Quiz_WindowsPhone\QuizServer\build\jar
      [jar] Building jar: C:\Users\Trip Admin\Desktop\Submissions\Verses Mode\Qu
iz_WindowsPhone\Quiz_WindowsPhone\QuizServer\build\jar\quizserver.jar

run:
     [java] Zone Created GOT_Quiz with key 8c2dcf00-0686-43bd-b
     [java] Room Created GOT_Quiz_Room1 with ID 647227785
     [java] Add user request jul
     [java] Room Created QuizRoom jul with ID 383274819
     [java] jul joined room Request
     [java] jul joined room Request Success
     [java] Received Start Quiz Packet1RoomId 383274819
     [java] Add user request emu
     [java] emu joined room Request
     [java] emu joined room Request Success
     [java] Received Start Quiz Packet2RoomId 383274819
     [java] Send Question Packet of 512
     [java] Sending Question to User jul
     [java] Sending Question to User emu
     [java] Answer Received 0
     [java] Send Answer
     [java] Answer Received 0
     [java] Send Answer
     [java] Send Answer
     [java] Send Answer
     [java] Send Question Packet of 512
     [java] Sending Question to User jul
     [java] Sending Question to User emu
     [java] QuizRoomAdaptor onUserLeaveRequest emu left room 383274819
     [java] QuizZoneAdaptor onUserRemoved jul
     [java] QuizRoomAdaptor onUserLeaveRequest jul left room 383274819
     [java] QuizZoneAdaptor onUserRemoved emu
     [java] java.lang.NullPointerException
     [java]     at java.util.Collections$UnmodifiableCollection.<init>(Unknown S
ource)
     [java]     at java.util.Collections$UnmodifiableList.<init>(Unknown Source)

     [java]     at java.util.Collections.unmodifiableList(Unknown Source)
     [java]     at com.shephertz.app42.server.domain.Room.getJoinedUsers(Room.ja
va:941)
     [java]     at quizserver.QuizRoomAdaptor.onTimerTick(Unknown Source)
     [java]     at com.shephertz.app42.server.domain.Room.handleTimerTick(Room.j
ava:857)
     [java]     at com.shephertz.app42.server.domain.Zone.handleTimerTick(Zone.j
ava:802)
     [java]     at com.shephertz.app42.server.handler.WarpProtocolHandler.handle
TimerTick(WarpProtocolHandler.java:539)
     [java]     at com.shephertz.app42.server.handler.LoopTask.run(WarpProtocolH
andler.java:676)
     [java]     at java.util.TimerThread.mainLoop(Unknown Source)
     [java]     at java.util.TimerThread.run(Unknown Source)
     [java] Deleting Room 383274819 true

 

Thanks

Answer 1

Hi,

 

Please update the onTimerTick method of QuizRoomAdaptor.

 

public void onTimerTick(long time) {

        /*

         * A game when room full

         * or we can say max users are equals to joined users

         * Once the game has started it will send question on every 10 seconds

         */

       try {

        if (HasAnyUserLeftTheRoom) {

            HasAnyUserLeftTheRoom=false;

            System.out.println("Deleting Room " + this.gameRoom.getId() + " " + this.izone.deleteRoom(gameRoom.getId()));

            gameRoom=null;

            GAME_STATUS = QuizConstants.STOPPED;

        }

        if (gameRoom!=null&&GAME_STATUS == QuizConstants.STOPPED && gameRoom.getJoinedUsers().size() == gameRoom.getMaxUsers() && gameRoom.getMaxUsers() == StartQuizFlag) {

            GAME_STATUS = QuizConstants.RUNNING;

            QuizTimerCount=Utils.LevelJson.getJSONObject(GameCurrentLevel).getInt("timePerQuestion") * 2-1;

            StartQuizFlag = 0;

        } else if (gameRoom!=null&&GAME_STATUS == QuizConstants.RUNNING) {

            QuizTimerCount++;

           

                if (GameCurrentLevel < Utils.LevelJson.length()) {

                    int timeCount = Utils.LevelJson.getJSONObject(GameCurrentLevel).getInt("timePerQuestion") * 2;

                    if (QuizTimerCount == timeCount) {

                        int totalQuestion = Utils.LevelJson.getJSONObject(GameCurrentLevel).getInt("totalQuestions");

                        if (GameCurrentQuestion != -1) {

                                AddDefaultAnswers();

                            }

                        if (GameCurrentQuestion < (totalQuestion - 1)) {

                            SendQuestion();

                        } else {

                            SendLevelEndPacket();

                        }

                    }

                }

            }

        }

        catch (Exception e) {

                e.printStackTrace();

            }

    }

Comments

Many thanks, I'll implement this later today.