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-779216/

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: 06/12/13 16:08
Description: Exception preparing structure feature

java.lang.OutOfMemoryError: Java heap space
	at dg.a(SourceFile:56)
	at dg.a(SourceFile:92)
	at aut.a(SourceFile:243)
	at aua.b(SourceFile:64)
	at auc.a(SourceFile:62)
	at atu.a(SourceFile:268)
	at atu.a(SourceFile:44)
	at apo.a(SourceFile:30)
	at apl.d(SourceFile:106)
	at ml.c(SourceFile:78)
	at ml.d(SourceFile:108)
	at afs.e(SourceFile:311)
	at afs.a(SourceFile:249)
	at afn.a(SourceFile:68)
	at mm.a(SourceFile:669)
	at xx.a(SourceFile:32)
	at xv.h(SourceFile:141)
	at afs.a(SourceFile:1368)
	at mm.a(SourceFile:480)
	at afs.g(SourceFile:1346)
	at afs.h(SourceFile:1253)
	at mm.h(SourceFile:365)
	at net.minecraft.server.MinecraftServer.u(SourceFile:510)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)


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

-- Head --
Stacktrace:
	at dg.a(SourceFile:56)
	at dg.a(SourceFile:92)
	at aut.a(SourceFile:243)
	at aua.b(SourceFile:64)
	at auc.a(SourceFile:62)
	at atu.a(SourceFile:268)

-- Feature being prepared --
Details:
	Is feature chunk: True
	Chunk location: -143,231
	Chunk pos hash: 996432412529
	Structure type: aud
Stacktrace:
	at atu.a(SourceFile:44)
	at apo.a(SourceFile:30)
	at apl.d(SourceFile:106)

-- Chunk to be generated --
Details:
	Location: -139,223
	Position hash: 962072674165
	Generator: FlatLevelSource
Stacktrace:
	at ml.c(SourceFile:78)
	at ml.d(SourceFile:108)
	at afs.e(SourceFile:311)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (-2209,224,3568), Chunk: (at 15,14,0 in -139,223; contains blocks -2224,0,3568 to -2209,255,3583), Region: (-5,6; contains chunks -160,192 to -129,223, blocks -2560,0,3072 to -2049,255,3583)
Stacktrace:
	at afs.a(SourceFile:249)
	at afn.a(SourceFile:68)
	at mm.a(SourceFile:669)
	at xx.a(SourceFile:32)
	at xv.h(SourceFile:141)
	at afs.a(SourceFile:1368)
	at mm.a(SourceFile:480)
	at afs.g(SourceFile:1346)

-- Entity being ticked --
Details:
	Entity Type: Fireball (xx)
	Entity ID: 99121
	Entity Name: Boule de feu
	Entity's Exact location: 1100,47, 4,32, 258,90
	Entity's Block location: World: (1100,4,258), Chunk: (at 12,0,2 in 68,16; contains blocks 1088,0,256 to 1103,255,271), Region: (2,0; contains chunks 64,0 to 95,31, blocks 1024,0,0 to 1535,255,511)
	Entity's Momentum: -1,27, -0,33, -0,60
Stacktrace:
	at afs.h(SourceFile:1253)
	at mm.h(SourceFile:365)

-- Affected level --
Details:
	Level name: avion
	All players: 1 total; [mp['smourad'/87, l='avion', x=1117,37, y=7,41, z=267,10]]
	Chunk stats: ServerChunkCache: 6060 Drop: 0
	Level seed: 8270303391260620719
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (1120,4,250), Chunk: (at 0,0,10 in 70,15; contains blocks 1120,0,240 to 1135,255,255), Region: (2,0; contains chunks 64,0 to 95,31, blocks 1024,0,0 to 1535,255,511)
	Level time: 17106 game time, 17106 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 111354 (now: false), thunder time: 115815 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:510)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)

-- System Details --
Details:
	Minecraft Version: 1.7.3
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 8640608 bytes (8 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2938 (164528 bytes; 0 MB) allocated, 2727 (152712 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 11266 (630896 bytes; 0 MB) allocated, 374 (20944 bytes; 0 MB) used
	Player Count: 1 / 8; [mp['smourad'/87, l='avion', x=1117,37, y=7,41, z=267,10]]
	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-779216/36139755/