I've not been able to figure out what's causing my throwable entity to lose the player as the owner. AFAIK I'm doing it all correctly. Here's the code:

 

EntityRegistration

EntityRegistry.registerModEntity(EntityWebString.class, "Web String", webStringID, this, 128, 10, true);

 

EntityThrowable

public class EntityWebString extends EntityThrowable{

public EntityPlayer spiderMan;

public EntityWebString(World world){
	super(world);
	this.spiderMan = (EntityPlayer) this.getThrower();
}

public EntityWebString(World world,	EntityLivingBase throwingEntity) {
	super(world, throwingEntity);
	this.spiderMan = (EntityPlayer) throwingEntity;
	this.ignoreFrustumCheck = true;
	this.setSize(0.1F, 0.1F);
	this.motionX *= 2F;
	this.motionZ *= 2F;
	this.motionY *= 2F;
	SuperHeroLogger.debug("Spawned String with owner:" + spiderMan);
}

@Override
protected float getGravityVelocity() {
	return 0.03F;
}

@Override
public void onUpdate() {
	super.onUpdate();
}

protected void onImpact(MovingObjectPosition hitPos) {
	SuperHeroLogger.debug("Object String: " + hitPos.hitInfo);
	SuperHeroLogger.debug("Owner is: " + this.spiderMan);
	SuperHeroLogger.debug("Owner is: " + this.getThrower());
	if(hitPos.typeOfHit == MovingObjectType.ENTITY){
		SuperHeroLogger.debug("Object Hit by String: " + hitPos.entityHit.toString());
		hitPos.entityHit.motionX = -0.75F * this.motionX;
		hitPos.entityHit.motionZ = -0.75F * this.motionZ;
		hitPos.entityHit.motionY += 0.5F;

		this.setDead();
	}
	else if(hitPos.typeOfHit == MovingObjectType.BLOCK){
		if(!Keyboard.isKeyDown(42)){
			try{
				SuperHeroLogger.debug("Block Hit by String: " + hitPos.blockX + "x, " + hitPos.blockZ + "z, " + hitPos.blockY + "y");
				this.spiderMan.motionX = 2F * this.motionX;
				this.spiderMan.motionZ = 2F * this.motionZ;
				this.spiderMan.motionY = (double)(4.0F * -MathHelper.sin(this.spiderMan.rotationPitch / 180.0F * (float)Math.PI));
			}
			catch(NullPointerException e){
				SuperHeroLogger.error(e.getMessage());
				e.printStackTrace();
			}
		}
		this.setDead();
	}

}

}

 

Item Right click code

@Override
public ItemStack onItemRightClick(ItemStack itemStack, World world, EntityPlayer player) {
	EntityWebString string = new EntityWebString(world, player);

	switch (shotType){
	case 0:
		if(player.inventory.hasItem(SpiderMan.webString)){
			if(!world.isRemote){
				world.spawnEntityInWorld(string);
			}
			player.inventory.consumeInventoryItem(SpiderMan.webString);
		}
		break;
	case 1:
		if (player.inventory.hasItem(SpiderMan.webBall)){
			if(!world.isRemote){
				world.spawnEntityInWorld(new EntityWebBallNew(world, player));
			}
			player.inventory.consumeInventoryItem(SpiderMan.webBall);
		}
		break;
	}

	return super.onItemRightClick(itemStack, world, player);
}

 

Log Output

[15:06:30] [Client thread/ERROR] [dg_shc]: Spawned String with owner:EntityClientPlayerMP['rara_avia'/268, l='MpServer', x=-260.85, y=68.62, z=226.77]
[15:06:30] [server thread/ERROR] [dg_shc]: Spawned String with owner:EntityPlayerMP['rara_avia'/268, l='New World', x=-260.85, y=67.00, z=226.77]
[15:06:30] [Client thread/ERROR] [dg_shc]: Owner is: null
[15:06:30] [Client thread/ERROR] [dg_shc]: Owner is: null
[15:06:30] [Client thread/ERROR] [dg_shc]: null
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: java.lang.NullPointerException
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.dudgames.spiderman.entities.EntityWebString.onImpact(EntityWebString.java:64)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.entity.projectile.EntityThrowable.onUpdate(EntityThrowable.java:229)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.dudgames.spiderman.entities.EntityWebString.onUpdate(EntityWebString.java:45)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2298)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.world.World.updateEntity(World.java:2258)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.world.World.updateEntities(World.java:2108)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.client.Minecraft.runTick(Minecraft.java:2097)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1039)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.client.Minecraft.run(Minecraft.java:962)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.client.main.Main.main(Main.java:164)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at java.lang.reflect.Method.invoke(Unknown Source)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source)
[15:06:30] [Client thread/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: 	at GradleStart.main(Unknown Source)
[15:06:30] [server thread/ERROR] [dg_shc]: Owner is: EntityPlayerMP['rara_avia'/268, l='New World', x=-260.85, y=67.00, z=226.77]
[15:06:30] [server thread/ERROR] [dg_shc]: Owner is: EntityPlayerMP['rara_avia'/268, l='New World', x=-260.85, y=67.00, z=226.77]

 

 

You're using CLIENT only code in your #onImpact method:

if(!Keyboard.isKeyDown(42)){

Not good. Also, your 'spiderMan' field will always be null on the client side unless you specifically send it with the spawn packet - implement IEntityAdditionalSpawnData.

Thanks! By removing the Client only code and implementing IEntityAdditionalSpawnData the problem was fixed! Thank you so much!