Trying to set up a server and...

I keep getting a huge flow of errors in the console. Stuff like:

Code:

2011-03-07 13:44:01 [SEVERE] java.lang.NoSuchMethodError: java.util.Arrays.copyOf([JI)[J
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.LongHashset.popFirst(LongHashset.java:84)
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.ChunkProviderServer.a(ChunkProviderServer.java:209)
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.World.g(World.java:1416)
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:329)
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:253)
2011-03-07 13:44:01 [SEVERE]     at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
2011-03-07 13:44:01 [SEVERE] Unexpected exception
java.lang.NoSuchMethodError: java.util.Arrays.copyOf([JI)[J
    at net.minecraft.server.LongHashset.popFirst(LongHashset.java:84)
    at net.minecraft.server.ChunkProviderServer.a(ChunkProviderServer.java:209)
    at net.minecraft.server.World.g(World.java:1416)
    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:329)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:253)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)

I've tried to install Multiverse, Runecraft, and Essentials, and have gotten all but Multiverse to work. Can anyone tell from this if I did something wrong in the config file or how to get more indepth help?
As of now, the spawn will load, but anything past that is just void, and after a while, you just time out.


EDIT: I tried to fresh install it, but started getting this error when using permissions:

Code:

14:39:52 [SEVERE] Could not load plugins/Permissions.jar in plugins: null
org.bukkit.plugin.InvalidPluginException
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:80)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:129)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:94)
    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.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:30)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:242)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:72)

 

What java version do you have (use "java -version")?

 

1.5.0_26 on a mac

EDIT: Reinstalled Runecraft and no errors.

 

1.5 is pretty old. Bukkit is 1.5 compatible since some version a while back, but not all plugins are I think.

 

Ah. Thanks.

 

go into software update and look a java update.

Apple uses a there own version of java.

 

I tried that, but apple stops updating java for older computers unless they upgrade to a newer OS. I use an alienware computer usually and it works well for pretty much everything, except for minecraft.