Minecraft renderer crashing

NOTE: This error doesn't happen anymore for some reason.

Hello, I was working on a Bukkit plugin and I ran this code:

Code:java

 // Bat
int b = 0;
for (Entity bat : p.getWorld().getEntities()) {
if (bat instanceof Bat) {
((Bat) bat).setHealth(0.0D);
b++;
}
}
sender.sendMessage("" + ChatColor.DARK_RED + b + ChatColor.GOLD
+ " bats where killed");
getLogger().info("" + b + " bats were killed!");
b = 0;
// Slime
int s = 0;
 
for (Entity slime : p.getWorld().getEntities()) {
if (slime instanceof Slime) {
((Slime) slime).setHealth(0.0D);
s++;
}
}
sender.sendMessage("" + ChatColor.DARK_RED + s + ChatColor.GOLD
+ " slimes where killed");
getLogger().info("" + s + " slimes were killed!");
s = 0;
}
 

When this was run with a bat and a slime in the world my screen went a blue colour, and a few seconds later, mob shadows disappear and then I cant do anything. When I press escape, my mouse comes back, but nothing happens in the game window.

The server log showed that 1 bat and 1 slime was killed.

This error didn't occur when there wasn't both of those animals being killed at once.

The log also only showed that I had been disconnected after I closed the game and I could rejoin just fine after restarting it.

Does anyone else have this problem? Or is it just me?

(Note: I posted this in Bukkit Discussion because I didn't think that this question was suited for another category.)

Charlie

NOTE: This problem is not happening anymore

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