Boss bar problem

Discussion in 'Plugin Development' started by KaiPol, Dec 28, 2013.

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  1. Offline

    KaiPol

    Hello! I've been working on a boss bar message for my server and it works, but I get an annoying error every time someone joins.
    I'm using http://forums.bukkit.org/threads/tutorial-utilizing-the-boss-health-bar.158018/ chasechocolate 's resource.

    Here's the code for the class(the resource):
    Code:java
    1. package me.KaiPol.Hunter;
    2.  
    3. import java.lang.reflect.Field;
    4. import java.util.HashMap;
    5.  
    6. import net.minecraft.server.v1_7_R1.DataWatcher;
    7. import net.minecraft.server.v1_7_R1.EntityPlayer;
    8. import net.minecraft.server.v1_7_R1.Packet;
    9. import net.minecraft.server.v1_7_R1.PacketPlayInClientCommand;
    10. import net.minecraft.server.v1_7_R1.PacketPlayOutSpawnEntityLiving;
    11. import net.minecraft.server.v1_7_R1.PacketPlayOutEntityDestroy;
    12. import net.minecraft.server.v1_7_R1.PacketPlayOutEntityMetadata;
    13.  
    14. import org.bukkit.Location;
    15. import org.bukkit.craftbukkit.v1_7_R1.entity.CraftPlayer;
    16. import org.bukkit.entity.EntityType;
    17. import org.bukkit.entity.Player;
    18. import org.bukkit.plugin.PluginManager;
    19. import org.bukkit.scheduler.BukkitRunnable;
    20.  
    21. // IMPORTANT
    22. // Remember to change "yourMainClass" to your plugin's main class and "yourPackage" to your package's name
    23. // Original code by chasechocolate
    24. // Modified by ftbastler for Minecraft 1.7
    25.  
    26. public class PacketUtils {
    27.   public static final int ENTITY_ID = 1234;
    28.  
    29.     private static HashMap<String, Boolean> hasHealthBar = new HashMap<String, Boolean>();
    30.  
    31.     public static void sendPacket(Player player, Packet packet){
    32.         EntityPlayer entityPlayer = ((CraftPlayer) player).getHandle();
    33.  
    34.         entityPlayer.playerConnection.sendPacket(packet);
    35.     }
    36.  
    37.     public static Field getField(Class<?> cl, String field_name){
    38.         try {
    39.             Field field = cl.getDeclaredField(field_name);
    40.             return field;
    41.         } catch (SecurityException e) {
    42.             e.printStackTrace();
    43.         } catch (NoSuchFieldException e) {
    44.             e.printStackTrace();
    45.         }
    46.         return null;
    47.     }
    48.  
    49.     //Accessing packets
    50.     @SuppressWarnings("deprecation")
    51.     public static PacketPlayOutSpawnEntityLiving getMobPacket(String text, Location loc){
    52.         PacketPlayOutSpawnEntityLiving mobPacket = new PacketPlayOutSpawnEntityLiving();
    53.  
    54.         try {
    55.             Field a = getField(mobPacket.getClass(), "a");
    56.             a.setAccessible(true);
    57.             a.set(mobPacket, (int) ENTITY_ID);
    58.  
    59.             Field b = getField(mobPacket.getClass(), "b");
    60.             b.setAccessible(true);
    61.             b.set(mobPacket, (byte) EntityType.WITHER.getTypeId());
    62.  
    63.             Field c = getField(mobPacket.getClass(), "c");
    64.             c.setAccessible(true);
    65.             c.set(mobPacket, (int) Math.floor(loc.getBlockX() * 32.0D));
    66.  
    67.             Field d = getField(mobPacket.getClass(), "d");
    68.             d.setAccessible(true);
    69.             d.set(mobPacket, (int) Math.floor(loc.getBlockY() * 32.0D));
    70.  
    71.             Field e = getField(mobPacket.getClass(), "e");
    72.             e.setAccessible(true);
    73.             e.set(mobPacket, (int) Math.floor(loc.getBlockZ() * 32.0D));
    74.  
    75.             Field f = getField(mobPacket.getClass(), "f");
    76.             f.setAccessible(true);
    77.             f.set(mobPacket, (byte) 0);
    78.  
    79.             Field g = getField(mobPacket.getClass(), "g");
    80.             g.setAccessible(true);
    81.             g.set(mobPacket, (byte) 0);
    82.  
    83.             Field h = getField(mobPacket.getClass(), "h");
    84.             h.setAccessible(true);
    85.             h.set(mobPacket, (byte) 0);
    86.  
    87.             Field i = getField(mobPacket.getClass(), "i");
    88.             i.setAccessible(true);
    89.             i.set(mobPacket, (byte) 0);
    90.  
    91.             Field j = getField(mobPacket.getClass(), "j");
    92.             j.setAccessible(true);
    93.             j.set(mobPacket, (byte) 0);
    94.  
    95.             Field k = getField(mobPacket.getClass(), "k");
    96.             k.setAccessible(true);
    97.             k.set(mobPacket, (byte) 0);
    98.  
    99.         } catch (IllegalArgumentException e1) {
    100.             // TODO Auto-generated catch block
    101.             e1.printStackTrace();
    102.         } catch (IllegalAccessException e1) {
    103.             // TODO Auto-generated catch block
    104.             e1.printStackTrace();
    105.         }
    106.  
    107.         DataWatcher watcher = getWatcher(text, 300);
    108.  
    109.         try{
    110.             Field t = PacketPlayOutSpawnEntityLiving.class.getDeclaredField("l");
    111.             t.setAccessible(true);
    112.             t.set(mobPacket, watcher);
    113.         } catch(Exception ex){
    114.             ex.printStackTrace();
    115.         }
    116.  
    117.         return mobPacket;
    118.     }
    119.  
    120.     public static PacketPlayOutEntityDestroy getDestroyEntityPacket(){
    121.         PacketPlayOutEntityDestroy packet = new PacketPlayOutEntityDestroy();
    122.  
    123.         Field a = getField(packet.getClass(), "a");
    124.         a.setAccessible(true);
    125.         try {
    126.             a.set(packet, new int[]{ENTITY_ID});
    127.         } catch (IllegalArgumentException e) {
    128.             e.printStackTrace();
    129.         } catch (IllegalAccessException e) {
    130.             e.printStackTrace();
    131.         }
    132.  
    133.         return packet;
    134.     }
    135.  
    136.     public static PacketPlayOutEntityMetadata getMetadataPacket(DataWatcher watcher){
    137.         PacketPlayOutEntityMetadata metaPacket = new PacketPlayOutEntityMetadata();
    138.  
    139.         Field a = getField(metaPacket.getClass(), "a");
    140.         a.setAccessible(true);
    141.         try {
    142.             a.set(metaPacket, (int) ENTITY_ID);
    143.         } catch (IllegalArgumentException e1) {
    144.             e1.printStackTrace();
    145.         } catch (IllegalAccessException e1) {
    146.             e1.printStackTrace();
    147.         }
    148.  
    149.         try{
    150.             Field b = PacketPlayOutEntityMetadata.class.getDeclaredField("b");
    151.             b.setAccessible(true);
    152.             b.set(metaPacket, watcher.c());
    153.         } catch(Exception e){
    154.             e.printStackTrace();
    155.         }
    156.  
    157.         return metaPacket;
    158.     }
    159.  
    160.     public static PacketPlayInClientCommand getRespawnPacket(){
    161.         PacketPlayInClientCommand packet = new PacketPlayInClientCommand();
    162.  
    163.         Field a = getField(packet.getClass(), "a");
    164.         a.setAccessible(true);
    165.         try {
    166.             a.set(packet, (int) 1);
    167.         } catch (IllegalArgumentException e) {
    168.             e.printStackTrace();
    169.         } catch (IllegalAccessException e) {
    170.             e.printStackTrace();
    171.         }
    172.  
    173.         return packet;
    174.     }
    175.  
    176.     public static DataWatcher getWatcher(String text, int health){
    177.         DataWatcher watcher = new DataWatcher(null);
    178.  
    179.         watcher.a(0, (Byte) (byte) 0x20); //Flags, 0x20 = invisible
    180.         watcher.a(6, (Float) (float) health);
    181.         watcher.a(10, (String) text); //Entity name
    182.         watcher.a(11, (Byte) (byte) 1); //Show name, 1 = show, 0 = don't show
    183.         //watcher.a(16, (Integer) (int) health); //Wither health, 300 = full health
    184.  
    185.         return watcher;
    186.     }
    187.  
    188.     //Other methods
    189.     public static void displayTextBar(String text, final Player player){
    190.         PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(text, player.getLocation());
    191.  
    192.         sendPacket(player, mobPacket);
    193.         hasHealthBar.put(player.getName(), true);
    194.  
    195.         new BukkitRunnable(){
    196.             @Override
    197.             public void run(){
    198.                 PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
    199.  
    200.                 sendPacket(player, destroyEntityPacket);
    201.                 hasHealthBar.put(player.getName(), false);
    202.             }
    203.         }.runTaskLater(Hunter.plugin, 120L);
    204.     }
    205.  
    206.     public static void displayLoadingBar(final String text, final String completeText, final Player player, final int healthAdd, final long delay, final boolean loadUp){
    207.         PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(text, player.getLocation());
    208.  
    209.         sendPacket(player, mobPacket);
    210.         hasHealthBar.put(player.getName(), true);
    211.  
    212.         new BukkitRunnable(){
    213.             int health = (loadUp ? 0 : 300);
    214.  
    215.             @Override
    216.             public void run(){
    217.                 if((loadUp ? health < 300 : health > 0)){
    218.                     DataWatcher watcher = getWatcher(text, health);
    219.                     PacketPlayOutEntityMetadata metaPacket = getMetadataPacket(watcher);
    220.  
    221.                     sendPacket(player, metaPacket);
    222.  
    223.                     if(loadUp){
    224.                         health += healthAdd;
    225.                     } else {
    226.                         health -= healthAdd;
    227.                     }
    228.                 } else {
    229.                     DataWatcher watcher = getWatcher(text, (loadUp ? 300 : 0));
    230.                     PacketPlayOutEntityMetadata metaPacket = getMetadataPacket(watcher);
    231.                     PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
    232.  
    233.                     sendPacket(player, metaPacket);                   
    234.                     sendPacket(player, destroyEntityPacket);
    235.                     hasHealthBar.put(player.getName(), false);
    236.  
    237.                     //Complete text
    238.                     PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(completeText, player.getLocation());
    239.  
    240.                     sendPacket(player, mobPacket);
    241.                     hasHealthBar.put(player.getName(), true);
    242.  
    243.                     DataWatcher watcher2 = getWatcher(completeText, 300);
    244.                     PacketPlayOutEntityMetadata metaPacket2 = getMetadataPacket(watcher2);
    245.  
    246.                     sendPacket(player, metaPacket2);
    247.  
    248.                     new BukkitRunnable(){
    249.                         @Override
    250.                         public void run(){
    251.                             PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
    252.  
    253.                             sendPacket(player, destroyEntityPacket);
    254.                             hasHealthBar.put(player.getName(), false);
    255.                         }
    256.                     }.runTaskLater(Hunter.plugin, 40L);
    257.  
    258.                     this.cancel();
    259.                 }
    260.             }
    261.         }.runTaskTimer(Hunter.plugin, delay, delay);
    262.     }
    263.  
    264.     public static void displayLoadingBar(final String text, final String completeText, final Player player, final int secondsDelay, final boolean loadUp){
    265.         final int healthChangePerSecond = 300 / secondsDelay;
    266.  
    267.         displayLoadingBar(text, completeText, player, healthChangePerSecond, 20L, loadUp);
    268.     }
    269. }


    Importing the code to use in the main class:
    Code:java
    1. private PacketUtils PacketUtils = new PacketUtils();


    Using the code in the main class:
    Code:java
    1.             @EventHandler
    2.             public void onJoinEvent(PlayerJoinEvent event){
    3.                 Player player = event.getPlayer();
    4.                 PacketUtils.displayTextBar(ChatColor.GREEN + "Hello there, " + player.getName() + "!", player);
    5.             }


    Here's the error:
    Code:java
    1. [10:13:47 INFO]: teegah[/71.233.104.73:57441] logged in with entity id 471068 at
    2.  ([flatlands] 106.2550628393297, 262.9972798925172, -507.7115820675242)
    3. [10:13:47 ERROR]: Could not pass event PlayerJoinEvent to Hunter v1.7.2
    4. org.bukkit.event.EventException
    5.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    6. va:427) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    7.         at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
    8. a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    9.         at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
    10. ava:481) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    11.         at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
    12. ava:466) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    13.         at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:225) [craft
    14. bukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    15.         at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:116) [craft
    16. bukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    17.         at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:78) [
    18. craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    19.         at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42) [
    20. craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    21.         at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:149
    22. ) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    23.         at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
    24. tbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    25.         at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
    26. 55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    27.         at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
    28. 50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    29.         at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
    30. 45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    31.         at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
    32. :457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    33.         at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
    34. 17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    35. Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
    36.         at org.apache.commons.lang.Validate.notNull(Validate.java:203) ~[craftbu
    37. kkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    38.         at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.validate(Craf
    39. tScheduler.java:391) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    40.         at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.runTaskTimer(
    41. CraftScheduler.java:120) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    42.         at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.runTaskLater(
    43. CraftScheduler.java:104) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    44.         at org.bukkit.scheduler.BukkitRunnable.runTaskLater(BukkitRunnable.java:
    45. 64) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    46.         at me.KaiPol.Hunter.PacketUtils.displayTextBar(PacketUtils.java:203) ~[?
    47. :?]
    48.         at me.KaiPol.Hunter.Hunter.onJoinEvent(Hunter.java:306) ~[?:?]
    49.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
    50. _12-ea]
    51.         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
    52. _12-ea]
    53.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
    54. .7.0_12-ea]
    55.         at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_12-ea]
    56.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    57. va:425) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    58.         ... 14 more



    Please help?
     
    KaiPol, Dec 28, 2013
    #1
  2. Offline

    Chlorek

    Why people can't read stacktraces? I can't get it...
    PacketUtils.java at line 203 - you pass null where correct plugin instance should be passed. So your Hunter.plugin is null.
    PacketUtils.java:203
    Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
     
    Chlorek, Dec 28, 2013
    #2
    KaiPol likes this.
  3. Offline

    KaiPol

    Chlorek
    Thank you! I feel stupid now.
     
    KaiPol, Dec 28, 2013
    #3
  4. Offline

    ShearsSheep

    Go In between of Search This thread <Edit> Watch Thread, Click edit..mark it as solved..lawl. I'm OCD about this things..sorry..xD

    ​
    ​
     
    ShearsSheep, Dec 28, 2013
    #4
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