Help with calling items with names

Discussion in 'Plugin Development' started by KaiPol, Dec 21, 2013.

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  1. Offline

    KaiPol

    Hello! I have a small problem while trying to call an item with a name
    Here's my code checking it:
    Code:java
    1.                     ItemStack diamond = new ItemStack(Material.DIAMOND);
    2.                     if(diamond.getItemMeta().getDisplayName().equalsIgnoreCase(ChatColor.GOLD + "Upgrade Amour") || diamond.getItemMeta().getLore().equals(ChatColor.DARK_RED + "Upgrade level 1")){
    3.                         player.sendMessage("hi");

    and here's my code setting the display name and adding it to the gui(The gui shouldn't be important)
    Code:java
    1.             ItemStack diamond = new ItemStack(Material.DIAMOND);
    2.             ItemMeta diamondMeta = diamond.getItemMeta();
    3.             diamondMeta.setDisplayName(ChatColor.GOLD + "Upgrade Amour");
    4.             diamondMeta.setLore(Arrays.asList(ChatColor.DARK_RED + "Upgrade level 1"));
    5.             diamond.setItemMeta(diamondMeta);
    6.             inventory.addItem(diamond);

    This is the error:
    Code:java
    1. [07:52:34 ERROR]: Could not pass event InventoryClickEvent to Hunter v1.7.2
    2. org.bukkit.event.EventException
    3.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    4. va:427) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    5.         at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
    6. a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    7.         at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
    8. ava:481) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    9.         at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
    10. ava:466) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    11.         at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
    12. :1348) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    13.         at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.a(SourceFile:32)
    14. [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    15.         at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.handle(SourceFil
    16. e:10) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    17.         at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146
    18. ) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    19.         at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
    20. tbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    21.         at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
    22. 55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    23.         at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
    24. 50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    25.         at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
    26. 45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    27.         at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
    28. :457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    29.         at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
    30. 17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    31. Caused by: java.lang.NullPointerException
    32.         at me.KaiPol.Hunter.Hunter.inventoryclick(Hunter.java:282) ~[?:?]
    33.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
    34. _12-ea]
    35.         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
    36. _12-ea]
    37.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
    38. .7.0_12-ea]
    39.         at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_12-ea]
    40.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    41. va:425) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    42.         ... 13 more
    43. [07:52:40 ERROR]: Could not pass event InventoryClickEvent to Hunter v1.7.2
    44. org.bukkit.event.EventException
    45.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    46. va:427) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    47.         at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
    48. a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    49.         at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
    50. ava:481) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    51.         at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
    52. ava:466) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    53.         at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
    54. :1348) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    55.         at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.a(SourceFile:32)
    56. [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    57.         at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.handle(SourceFil
    58. e:10) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    59.         at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146
    60. ) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    61.         at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
    62. tbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    63.         at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
    64. 55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    65.         at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
    66. 50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    67.         at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
    68. 45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    69.         at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
    70. :457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    71.         at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
    72. 17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    73. Caused by: java.lang.NullPointerException
    74.         at me.KaiPol.Hunter.Hunter.inventoryclick(Hunter.java:282) ~[?:?]
    75.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
    76. _12-ea]
    77.         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
    78. _12-ea]
    79.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
    80. .7.0_12-ea]
    81.         at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_12-ea]
    82.         at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    83. va:425) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.1-b2969jnks]
    84.         ... 13 more
     
    KaiPol, Dec 21, 2013
    #1
  2. Offline

    XvBaseballkidvX

    Do this when checking:
    Code:java
    1. if(player.getItemInHand().getItemMeta == null) return;
    2. if(player.getItemInHand().getItemMeta().equals(diamond.getItemMeta()){
    3. //Do stuff
    4. }
     
    XvBaseballkidvX, Dec 21, 2013
    #2
  3. Offline

    KaiPol

    XvBaseballkidvX
    I don't think this will work because I applied the ItemMeta in another Event.
     
    KaiPol, Dec 21, 2013
    #3
  4. Offline

    XvBaseballkidvX

    Hmm, if you are going to need to access items in other classes, you might want to make an Items Class:
    Code:java
    1. public class Items {
    2.  
    3.         //Creating an ItemStack
    4.     public static ItemStack example;
    5.  
    6.     //IMPORTANT: Make sure on your onEnable method you do this: Items.registerItems(); or else the items wont be created
    7.     public static void registerItems(){
    8.  
    9.         example = setData(new ItemStack(Material.SNOW_BALL), "Example", Arrays.asList(
    10.                 "Merry Christmas!"));
    11.  
    12.     }
    13.  
    14. //A method for setting ItemMeta
    15.  
    16.     public static ItemStack setData(ItemStack item, String name, List<String> lore){
    17.         ItemMeta m = item.getItemMeta();
    18.         m.setDisplayName(name);
    19.         m.setLore(lore);
    20.         item.setItemMeta(m);
    21.  
    22.         return item;
    23.  
    24.     }
    25. }


    Then in other classes you will be able to do this:
    Code:java
    1. if(player.getItemInHand().getItemMeta() == null) return;
    2. if(player.getItemInHand().getItemMeta().equals(Items.example.getItemMeta()){
    3. player.sendMessage("Have a nice Christmas Break!");  ^^Right here we get 'examples' item meta :D
    4. }
     
    XvBaseballkidvX, Dec 21, 2013
    #4
  5. Offline

    KaiPol

    Thank you for this, but after posting my post I started thinking WHY it wasn't in the same class lol.
     
    KaiPol, Dec 21, 2013
    #5
    XvBaseballkidvX likes this.
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