PaperMC/test-plugin/src/main/java/io/papermc/paper/testplugin/TestPlugin.java

package io.papermc.paper.testplugin;

import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;

public final class TestPlugin extends JavaPlugin implements Listener {
    @Override
    public void onEnable() {
        this.getServer().getPluginManager().registerEvents(this, this);
    }
}