Error: Unsupported major.minor version 52.0

Hi Everyone,

Recently I started developing plugins and when I put my plugin on my server it would not show up nor work.
I've compiled the plugin with jre 6,7, and 8. Nothing worked. Can anyone help me solve this error?

Error I'm Getting, Below

Code:

[18:01:49 ERROR]: Could not load 'plugins/EventHandle.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/penguin/EventHandle : Unsupported major.minor version 52.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugins(CraftServer.java:357) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.<init>(CraftServer.java:319) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at net.minecraft.server.v1_7_R3.PlayerList.<init>(PlayerList.java:68) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at net.minecraft.server.v1_7_R3.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:126) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:436) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
Caused by: java.lang.UnsupportedClassVersionError: me/penguin/EventHandle : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_75]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800) ~[?:1.7.0_75]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.7.0_75]
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) ~[?:1.7.0_75]
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71) ~[?:1.7.0_75]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.7.0_75]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_75]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_75]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_75]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_75]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_75]
        at java.lang.Class.forName0(Native Method) ~[?:1.7.0_75]
        at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_75]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.2-R0.3-30-ge027d69-b3058jnks]

 

Yes,

Yes I have, my compiler on eclipse is set to 1.6. And I used 1.7 also.

EDIT by Timtower: merged posts

 

Well that's silly advice. If you want to use a red crayon do you buy a new pack of crayons and throw the rest out?

Setting your JRE won't make a difference, your JDK is what matters.

Try unchecking "Use default compliance settings", and show the project-specific settings here.