Plugin Development Error

Hi,

I just started developing and already got the first error:

Error:

Code:

[21:46:53 ERROR]: Could not load 'plugins/MagicBlocks.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/ftraun/main/Main : Unsupported major.minor version 52.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:288) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.<init>(CraftServer.java:250) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at net.minecraft.server.v1_8_R1.PlayerList.<init>(PlayerList.java:69) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at net.minecraft.server.v1_8_R1.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:133) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:473) [craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at java.lang.Thread.run(Thread.java:701) [?:1.6.0_34]
Caused by: java.lang.UnsupportedClassVersionError: me/ftraun/main/Main : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_34]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:643) ~[?:1.6.0_34]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.6.0_34]
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) ~[?:1.6.0_34]
        at java.net.URLClassLoader.access$000(URLClassLoader.java:73) ~[?:1.6.0_34]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:212) ~[?:1.6.0_34]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_34]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205) ~[?:1.6.0_34]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323) ~[?:1.6.0_34]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268) ~[?:1.6.0_34]
        at java.lang.Class.forName0(Native Method) ~[?:1.6.0_34]
        at java.lang.Class.forName(Class.java:274) ~[?:1.6.0_34]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit-1.8.jar:git-Bukkit-bc03b6f]
        ... 9 more

My plugin.yml:

Code:

main: me.ftraun.main.Main
name: MagicBlocks
version: 1.0
author: FlorianTraun

commands:
  test:
    description: Test Command
    usage: /<command>

And the Main.java:

Code:

package me.ftraun.main;

import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin {

    @Override
    public void onEnable() {
        System.out.println("MagicBlocks has been activiated");
    }
   
    @Override
    public void onDisable() {
        System.out.println("MagicBlocks is disabled");
    }
   
}

I have attached a screenshot of my project tree and I have imported the craftbukkit-api.jar

Thanks!
Flo

 

@secretflo Why do you have a plugin listed in your plugin.yml when you don't even have a command?

 

Don't use system out, use logger (getServer().getLogger())
You don't need enable disable messages because bukkit does them for you.
Lastly the solution to your prob is to compile the plugin with a version supported by your server. I assume server runs on java version <1.8

 

Hmm, try using :

main: me.ftraun.main.Main
name: MagicBlocks
version: 1.0
author: FlorianTraun
As you do not actually have a command in your main class.