Loading Plugin Issue

Hi, I am new to Minecraft development and am trying to make a simple "hello world" type plugin to get started. My program gives me no errors. I will paste my code below.

Main.java
package me.wailua.OutliningUtility;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
public class Main extends JavaPlugin {

@Override
public void onEnable() {

}
@Override
public void onDisable() {

}
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

if (label.equalsIgnoreCase("hello")) {
if (sender instanceof Player) {
Player player = (Player) sender;
if (player.hasPermission("hello.use")) {
player.sendMessage("Welcome to my test server");
return true;
}
player.sendMessage("You do not have permission");
return true;
}

else {
sender.sendMessage("Welcome to my test server");
return true;
}
}

return false;
}

}

plugin.yml
name: OutliningUtility
version: 1.0
author: Wailua
main: me.wailua.OutliningUtility.Main
commands:
Hello:

Error

When I export this plugin as a Jar file and load it into the test server and restart, the console provides the following message:

18.12 21:48:43 [Server] ERROR Could not load 'plugins/OutliningUtility1012.jar' in folder 'plugins'

I have made several changes to my plugin.yml file based on previous threads I have read suggesting that was the issue. None of these changes has made any difference, and I have run my plugin.yml through a yml validity checker and comes out valid.

Any help is much appreciated!

 

Code:

19.12 20:06:20 [Server] ERROR Could not load 'plugins/OutliningUtility1012.jar' in folder 'plugins'
19.12 20:06:20 [Server] INFO org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/wailua/OutliningUtility/Main has been compiled by a more recent version of the Java Runtime (class file version 58.0), this version of the Java Runtime only recognizes class file versions up to 52.0
19.12 20:06:20 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:327) ~[spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:305) [spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:205) [spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:545) [spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262]
19.12 20:06:20 [Server] INFO Caused by: java.lang.UnsupportedClassVersionError: me/wailua/OutliningUtility/Main has been compiled by a more recent version of the Java Runtime (class file version 58.0), this version of the Java Runtime only recognizes class file versions up to 52.0
19.12 20:06:20 [Server] INFO at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at java.lang.ClassLoader.defineClass(ClassLoader.java:756) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:148) ~[spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:100) ~[spigot_1.12.2.jar:git-Spigot-79a30d7-acbc348]
19.12 20:06:20 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at java.lang.Class.forName0(Native Method) ~[?:1.8.0_262]
19.12 20:06:20 [Server] INFO at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_262]

 

That resolved it. Thank you for your help!