Solved Throwable Items

How would i make a slimeball throw able and when it lands it should explode. i am pretty sure it can be done with the playerinteractevent when someone right clicks the item. Also how would i create an explosion where the slimeball lands?

 

This isn't possible, as it would require a separate Slimeball class. I'm not sure if you could do this with a modified version of Craftbukkit, but with vanilla Bukkit, it's not doable.

 

I would make a scheduler to check if the block one block below the slimeball isn't air, then remove the drop and make an explosion. For throwing items, check this thread.

 

You can use eggs or any other projectile, so you could use projectilehitevent to get notified on impact.

 

This code makes the slimeball throwable but there is no explosion can someone help?

Code:

@EventHandler
    public void slimeGrenade(PlayerInteractEvent event) {
        Player player = event.getPlayer();
        World world = player.getWorld();
            if (player.getItemInHand().getType() == Material.SLIME_BALL) {
                if (event.getAction() == Action.LEFT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_AIR) {
                    final Item grenade = world.dropItem(player.getEyeLocation(), new ItemStack(Material.SLIME_BALL));
                    grenade.setVelocity(player.getEyeLocation().getDirection());
                    new BukkitRunnable(){
                        @Override
                        public void run(){
                            grenade.remove();
                            grenade.getWorld().createExplosion(grenade.getLocation(), 5F);
                        }                       
                    }.runTaskLater(plugin, 100L);
                }
            }
        }
    }

Bump! Can someone help me?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Save the entity I'd of the fireball somewhere, schedule a synchronous delayed task for however long you want the fuse to be, and in that task get the entity representing the fireball using the ID you just saved, and create an explosion (it's something like world.createExplosion(location))

 

I am still new to java and i know what a delayed task is but i don't know how to set it up

Edit: I tried and it threw out errors i tried these task

Code:

new BukkitRunnable(){
@Override
public void run(){
drop.remove();
drop.getWorld().createExplosion(drop.getLocation(), 5F);

Code:

plugin.getServer().getScheduler().scheduleAsyncDelayedTask(plugin, new Runnable() {
 
                                @Override
                                public void run() {
                                    grenade.getWorld().createExplosion(grenade.getLocation(), 5F);
                                    grenade.remove();
                                }
                            }, 40L);

Bump

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Well in the original code, you were removing the entity and then trying to get the world of the nonexistant entity.

what errors you getting?

 

Code:

20:28:44 [SEVERE] Could not pass event PlayerInteractEvent to Grenades
v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:26)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:479)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:464)
        at org.bukkit.craftbukkit.v1_5_R1.event.CraftEventFactory.callPlayerInte
ractEvent(CraftEventFactory.java:178)
        at org.bukkit.craftbukkit.v1_5_R1.event.CraftEventFactory.callPlayerInte
ractEvent(CraftEventFactory.java:148)
        at net.minecraft.server.v1_5_R1.PlayerConnection.a(PlayerConnection.java
:615)
        at net.minecraft.server.v1_5_R1.Packet15Place.handle(SourceFile:58)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:174
)
        at net.minecraft.server.v1_5_R1.PlayerConnection.d(PlayerConnection.java
:113)
        at net.minecraft.server.v1_5_R1.ServerConnection.b(SourceFile:35)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java
:66)
        at net.minecraft.server.v1_5_R1.MinecraftServer.r(MinecraftServer.java:5
82)
        at net.minecraft.server.v1_5_R1.DedicatedServer.r(DedicatedServer.java:2
29)
        at net.minecraft.server.v1_5_R1.MinecraftServer.q(MinecraftServer.java:4
71)
        at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java
:403)
        at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:5
73)
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:203)
        at org.bukkit.craftbukkit.v1_5_R1.scheduler.CraftScheduler.validate(Craf
tScheduler.java:390)
        at org.bukkit.craftbukkit.v1_5_R1.scheduler.CraftScheduler.runTaskTimer(
CraftScheduler.java:119)
        at org.bukkit.craftbukkit.v1_5_R1.scheduler.CraftScheduler.runTaskLater(
CraftScheduler.java:103)
        at me.God_Tenshi.scb.Grenades.onClick(Grenades.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:425)
        ... 17 more
>

That is the error

 

"plugin" is null.

 

Use this.

 

i need to cast Plugin when i use this. and there is still the same error and
Technius
I know it is null but i don't know how to fix

 

HelGod you are most likely not setting a value to your "plugin" variable. Use this:

Code:java

private <main class> plugin;
public <this class>(<main class> plugin){
  this.plugin = plugin;
}

 

This is my main class

Code:

public class Main extends JavaPlugin {
 
    public static Main plugin
    public final Grenades grenades = new Grenades(null);
    public final playerListener pl = new playerListener();
    public static Main instance;
 
    public void onEnable() {
        System.out.println("Grenades is Enabled!");
        PluginManager pm = getServer().getPluginManager();
        pm.registerEvents(grenades, this);
        pm.registerEvents(pl, this);
    }
 
    public void onDisable() {
        System.out.println("Grenades is Disabled!");
    }
}

My listener

Code:

List<UUID> droppedItems = new ArrayList<UUID>();
    private Main plugin;
   
    public Grenades(Main plugin){
        this.plugin = plugin;
        }
 
    @EventHandler
    public void onClick(PlayerInteractEvent event) {
        plugin = Main.instance;
        Player player = event.getPlayer();
        Inventory playerInv = player.getInventory();
        World world = player.getWorld();
        if (playerInv.contains(new ItemStack(Material.SLIME_BALL, 1))) {
            if (event.getAction() == Action.RIGHT_CLICK_AIR) {
                final Item grenade = world.dropItem(player.getEyeLocation(),
                        new ItemStack(Material.SLIME_BALL));
                droppedItems.add(grenade.getUniqueId());
                grenade.setVelocity(player.getEyeLocation().getDirection());
                Bukkit.getScheduler().runTaskLater(plugin, new Runnable() {
                    public void run() {
                    grenade.getWorld().createExplosion(grenade.getLocation(), 5F);
                    grenade.remove();
                    }
                }, 40L);
            }
        }
    }
}

 

Code:

plugin = Main.instance;

Main.instance is null. By the way, you do not need to set plugin every single time because you already set plugin inside of the Listener's constructor.

 

Oh, ok