Help with my plugin

Hello,

I made a plugin for players so that they can have a backpack.
But when I start my server to test it, it gives a error in the onEnable() command.

OnEnable() :

Code:

public class Project extends JavaPlugin {
String[] playerList;
Inventory[] inv;
Player player;
Material[] matData;
ItemStack[] workItem, dia;
int i, id=0;
String name;
 
public void onEnable() {
playerList[0]="...";
getLogger().info("Hello");
}
 
// and some more code ...
}

Error in Console :

Code:

[SEVERE] Error occurred while enabling Project v1.0 (Is it up to date?)
java.lang.NullPointerException
        at me.comexpert.Project.Project.onEnable(Project.java:23)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.java:282)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.java:264)
        at net.minecraft.server.v1_5_R3.MinecraftServer.j(MinecraftServer.java:304)
        at net.minecraft.server.v1_5_R3.MinecraftServer.e(MinecraftServer.java:283)
        at net.minecraft.server.v1_5_R3.MinecraftServer.a(MinecraftServer.java:243)
        at net.minecraft.server.v1_5_R3.DedicatedServer.init(DedicatedServer.java:151)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:382)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)

Do one of you know what the problem is ?

Thanks,

C0m_Expert99 (I know my name is stupid, but I named my name before making plugins )

EDIT : PS : The plugin is not done yet, I was just asking about the onEnable() part !

 

Read up on stack traces. They're there for a reason.

 

I red that post, but I can't get what I do wrong ...

Code:

public class Project extends JavaPlugin {
 
String[] playerList;
 
public void onEnable() {
playerList[0]="...";
}
 

It makes the String[] playerList before the onEnable() command, but still doesn't it work.

Or is the onEnable() command called BEFORE the make of the String[] playerList ?

 

Bump.

 

The array playerList was never initialised, you need to initialise it first:

Code:

String[] playerList = new String[Bukkit.getOnlinePlayers().length()]; // Create a String[] with as many slots as online players
 
public void onEnable () {
    for (int i = 0; i < Bukkit.getOnlinePlayers().length(); i++) {
        playerList[i] = Bukkit.getOnlinePlayers()[i].getName();
    }
    playerList[0] = "...";
}

EDIT: It's worth noting that at this point this will also generate an ArrayIndexOutOfBoundsException with no online players. So your best bet is to create the String[] when it is needed.

 

Thanks, that worked !