敵性モブをデスポーンさせるだけのMOD 1.7.10用のMinecraftForgeで作った

DespawnMobs.java

package net.firsp.mods;

import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import cpw.mods.fml.common.gameevent.TickEvent;
import net.minecraft.entity.Entity;
import net.minecraft.entity.boss.IBossDisplayData;
import net.minecraft.entity.monster.IMob;
import net.minecraft.server.MinecraftServer;

import java.util.Arrays;

@Mod(modid = "Despawn Mobs")
public class DespawnMobs {

    @Mod.EventHandler
    public void init(FMLInitializationEvent event) {
        FMLCommonHandler.instance().bus().register(this);
    }

    @SubscribeEvent
    public void tickEnd(TickEvent.ServerTickEvent event) {
        if (event.type == TickEvent.Type.SERVER && event.phase == TickEvent.Phase.END) {
            Arrays.stream(MinecraftServer.getServer().worldServers)
                    .filter(w -> w != null)
                    .forEach(w -> w.getLoadedEntityList()
                            .stream()
                            .filter(e -> e instanceof IMob)
                            .filter(e -> !(e instanceof IBossDisplayData))
                            .forEach(e -> ((Entity) e).setDead()));
        }
    }

}

build.gradleのapply plugin以降に
sourceCompatibility=JavaVersion.VERSION_1_8
targetCompatibility=JavaVersion.VERSION_1_8
を加えるとビルドできるはず
参考 https://twitter.com/alalwww/status/554023357687926784