Hopper: java.lang.OutOfMemoryError: Java heap space

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-293685/

Crash:

java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Sorry :(

Time: 10/10/13 5:51 PM
Description: Ticking entity

java.lang.OutOfMemoryError: Java heap space
	at oh.h(SourceFile:87)
	at oh.a(SourceFile:223)
	at oh.a(SourceFile:75)
	at awh.a(SourceFile:167)
	at awh.a(SourceFile:135)
	at awh.b(SourceFile:121)
	at awh.a(SourceFile:89)
	at awh.a(SourceFile:60)
	at awh.a(SourceFile:32)
	at afh.a(SourceFile:2197)
	at ub.a(SourceFile:89)
	at ub.a(SourceFile:93)
	at sw.e(SourceFile:88)
	at sp.a(SourceFile:103)
	at rc.bm(SourceFile:420)
	at rb.e(SourceFile:1309)
	at rc.e(SourceFile:295)
	at wm.e(SourceFile:25)
	at ww.e(SourceFile:156)
	at rb.h(SourceFile:1196)
	at rc.h(SourceFile:171)
	at wm.h(SourceFile:30)
	at ww.h(SourceFile:212)
	at afh.a(SourceFile:1367)
	at mf.a(SourceFile:479)
	at afh.g(SourceFile:1345)
	at afh.h(SourceFile:1252)
	at mf.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.u(SourceFile:510)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at oh.h(SourceFile:87)
	at oh.a(SourceFile:223)
	at oh.a(SourceFile:75)
	at awh.a(SourceFile:167)
	at awh.a(SourceFile:135)
	at awh.b(SourceFile:121)
	at awh.a(SourceFile:89)
	at awh.a(SourceFile:60)
	at awh.a(SourceFile:32)
	at afh.a(SourceFile:2197)
	at ub.a(SourceFile:89)
	at ub.a(SourceFile:93)
	at sw.e(SourceFile:88)
	at sp.a(SourceFile:103)
	at rc.bm(SourceFile:420)
	at rb.e(SourceFile:1309)
	at rc.e(SourceFile:295)
	at wm.e(SourceFile:25)
	at ww.e(SourceFile:156)
	at rb.h(SourceFile:1196)
	at rc.h(SourceFile:171)
	at wm.h(SourceFile:30)
	at ww.h(SourceFile:212)
	at afh.a(SourceFile:1367)
	at mf.a(SourceFile:479)

-- Entity being ticked --
Details:
	Entity Type: Zombie (ww)
	Entity ID: 53921
	Entity Name: Zombie
	Entity's Exact location: -97.50, 80.00, 182.17
	Entity's Block location: World: (-98,80,182), Chunk: (at 14,5,6 in -7,11; contains blocks -112,0,176 to -97,255,191), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.00, -0.08, 0.06
Stacktrace:
	at afh.h(SourceFile:1255)
	at mf.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.u(SourceFile:510)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kw.run(SourceFile:616)

-- Affected level --
Details:
	Level name: NW-13w36-aeae
	All players: 1 total; [mi['quonk'/902, l='NW-13w36-aeae', x=-57.63, y=64.00, z=231.09]]
	Chunk stats: ServerChunkCache: 746 Drop: 0
	Level seed: 698539510134468020
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-176,64,248), Chunk: (at 0,4,8 in -11,15; contains blocks -176,0,240 to -161,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 10157563 game time, 11565133 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 1246 (now: false), thunder time: 74202 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false

-- System Details --
Details:
	Minecraft Version: 13w41a
	Operating System: FreeBSD\ with\ Linux\ ABI (i386) version 2.6.16
	Java Version: 1.6.0_45, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 38048264 bytes (36 MB) / 495714304 bytes (472 MB) up to 495714304 bytes (472 MB)
	JVM Flags: 1 total; -Xmx512M
	AABB Pool Size: 23282 (1303792 bytes; 1 MB) allocated, 22579 (1264424 bytes; 1 MB) used
	IntCache: cache: 7, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 3816 (213696 bytes; 0 MB) allocated, 3467 (194152 bytes; 0 MB) used
	Player Count: 1 / 8; [mi['quonk'/902, l='NW-13w36-aeae', x=-57.63, y=64.00, z=231.09]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-293685/16550615/