What does this mean?

Code:

[SEVERE] Could not load plugins\CraftPack.jar in plugins: null
org.bukkit.plugin.InvalidPluginException
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:113)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:159)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:107)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:59)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:204)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:191)
    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:131)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:246)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:109)
    ... 8 more
Caused by: java.lang.NullPointerException
    at com.bukkit.techguard.craftpack.CraftPack.getName(CraftPack.java:78)
    at com.bukkit.techguard.craftpack.CraftPack.sM(CraftPack.java:85)
    at com.bukkit.techguard.craftpack.persistance.SQLite.<init>(SQLite.java:23)
    at com.bukkit.techguard.craftpack.CraftPack.<init>(CraftPack.java:25)
    ... 13 more

What does that error mean?

 

Invalid plugin exception usually means one of three things:

• You haven't got a valid plugin.yml
• you used a *.bukkit namespace
• you used the 'stupidly long contructor' in your plugin class

I know you're not the usual newb developer but have you done any of these things?

 

Code:

public CraftPack(){
}

That isn't very long..

I don't use any *.bukkit namespaces

And this doesn't look wrong to me.

Code:

name: CraftPack
main: com.bukkit.techguard.craftpack.CraftPack
version: 0.1
description: CraftZone Packet
authors:
  - TechGuardd

 

your main in the plugin.yml shouldnt have com.bukkit if you dont use one say if your package is techguard.craftpack and your main file is Craftpack then the main in your plugin.yml is techguard.craftpack.Craftpack

 

eh? My package is: com.bukkit.techguard.craftpack

 

well Edward Hand said you cant use com.bukkit anymore use com.teckguard.craftpack and in the plugin.yml use com.teckguard.craftpackCraftpack

 

Well, that is not the problem

 

You CANNOT use anything that starts with com.bukkit. At all. If your using com.bukkit it will throw a exception. You can do what I did and switch bukkit with your name so that you have: com.techguard.bukkit.Craftpack and that will work.

 

Changed it, but still not working.

 

Try to follow the logic - can something be null while you are initialising (constucting) the main class?

 

When I look at the stack trace you gave, it seems like your CraftPack.getName method throws a nullpointerexception at line 78. The reason you get the InvalidPluginException is that it will trigger if there is something wrong with the initiation of the plugin.

 

This.

Perhaps your getName() is returning a null String, and then you are trying to do some operation on that string which is throwing the exception since its null. Add a simple check for whatever uses that function.

Code:

String string = CraftPack.getName();
if(string!=null)
{
    //do string stuff here
}

 

getName, is actually getting the of the plugin.yml. Thanks for the help, eventually I will find a solution.

 

Hey tech if your still having problems post line 78 of your CraftPack.java.