Bukkit Plugin Problem (hElp)

so when i made my 1st ever plugin and this is the code :

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package me.ItzL1nX.grenader;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Egg;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.ProjectileHitEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class Grenader extends JavaPlugin implements Listener {

public void onEnable() {
Bukkit.getServer().getLogger().info("Plugin enabled!");
Bukkit.getPluginManager().registerEvents(this, this);
}
@EventHandler
public void onProjectileHit(ProjectileHitEvent e) {
if (e.getEntity() instanceof Egg & e.getEntity().getShooter() instanceof Player) {
if (((Player) e.getEntity().getShooter()).hasPermission("grenade.egg.explode")) {
e.getEntity().getWorld().createExplosion(e.getEntity().getLocation(), 1.0f, false);
((Player) e.getEntity().getShooter()).getInventory().remove(new ItemStack(Material.EGG, 1));
return;
}
return;
}
return;
}


}

And this is the error:

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[01:24:44] [Server thread/ERROR]: Could not load 'plugins/Grenader.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/ItzL1nX/grenader/Grenader : Unsupported major.minor version 52.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugins(CraftServer.java:355) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.<init>(CraftServer.java:317) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at net.minecraft.server.v1_7_R3.PlayerList.<init>(PlayerList.java:68) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at net.minecraft.server.v1_7_R3.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:126) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:436) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
Caused by: java.lang.UnsupportedClassVersionError: me/ItzL1nX/grenader/Grenader : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_71]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]
at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.7.0_71]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_71]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_71]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_71]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_71]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_71]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_71]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
... 9 more

HELPP

 

Make sure your server's jar is the same as the jar you compiled your plugin with.

 

i use the bukkit-1.7.10-R0.1-20140817.175650-8
server uses craftbukkit 1.7.9 R-0-2 (BETA)

 

Which java version do you use to compile?
And to run your server?

 

@timtower ok so how do i fix it?

 

You have to change the eclipse.ini (if you use eclipse)
You should have something like
C:\Program Files\Java\jre1.7\blabla\...
Change to C:\Program Files\Java\jre1.8\blabla\... (in fact, go in \Java\ to check the correct name)
Then, relaunch eclipse and recompile.
It should work fine.
If eclipse.ini is already with jre1.8, do the same with your .bat (if you use one) who launch your server.

 

yes i use eclipse

so i compile w/ Javase 1.7

 

Well, you are compiling with Java 1.8 when your server runs Java 1.7 try compiling with 1.7 then export it and restart your server, also post your plugin.yml if it doesn't work when compiled with 1.7!

Oh and, try change your server version from 1.7.9 to 1.7.10 or just select your buildpath as 1.7.9 If you are still having problems either reply with your skype or just private message me it. I'll add you and see what the problem is.