I was playing around with fireballs. What I expected to happen was a huge explosion.

What actually happened was lag, then a crash

Steps to Reproduce:
1.Do /summon Fireball ~ ~3 ~

or /summon Fireball ~ ~3 ~

(Not sure which caused the crash)
2. Hit the fireball.

---- Minecraft Crash Report ----
// If you need it.

Time: 1/25/15 9:19 AM
Description: Ticking entity

java.lang.OutOfMemoryError: Java heap space
at java.util.HashMap.newNode(HashMap.java:1734)
at java.util.HashMap.putVal(HashMap.java:641)
at java.util.HashMap.put(HashMap.java:611)
at java.util.HashSet.add(HashSet.java:219)
at aql.a(SourceFile:99)
at qu.a(SourceFile:850)
at ahk.a(SourceFile:34)
at ahi.t_(SourceFile:148)
at aqr.a(SourceFile:1407)
at qu.a(SourceFile:600)
at aqr.g(SourceFile:1385)
at aqr.i(SourceFile:1278)
at qu.i(SourceFile:478)
at net.minecraft.server.MinecraftServer.A(SourceFile:608)
at net.minecraft.server.MinecraftServer.z(SourceFile:532)
at cyk.z(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:448)
at java.lang.Thread.run(Thread.java:745)

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

– Head –
Stacktrace:
at java.util.HashMap.newNode(HashMap.java:1734)
at java.util.HashMap.putVal(HashMap.java:641)
at java.util.HashMap.put(HashMap.java:611)
at java.util.HashSet.add(HashSet.java:219)
at aql.a(SourceFile:99)
at qu.a(SourceFile:850)
at ahk.a(SourceFile:34)
at ahi.t_(SourceFile:148)
at aqr.a(SourceFile:1407)
at qu.a(SourceFile:600)
at aqr.g(SourceFile:1385)

– Entity being ticked –
Details:
Entity Type: Fireball (ahk)
Entity ID: 37728
Entity Name: Fireball
Entity's Exact location: -201.02, 109.37, 151.70
Entity's Block location: -202.00,109.00,151.00 - World: (-202,109,151), Chunk: (at 6,6,7 in -13,9; contains blocks -208,0,144 to -193,255,159), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.81, 0.00, 0.00
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at aqr.i(SourceFile:1278)
at qu.i(SourceFile:478)

– Affected level –
Details:
Level name: Boom
All players: 1 total; [qx['Motorblade'/265, l='Boom', x=-204.73, y=106.37, z=151.70]]
Chunk stats: ServerChunkCache: 8024 Drop: 0
Level seed: -9029737390552155087
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: -78.00,64.00,14.00 - World: (-78,64,14), Chunk: (at 2,4,14 in -5,0; contains blocks -80,0,0 to -65,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 3959 game time, 3959 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 88163 (now: false), thunder time: 86769 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.A(SourceFile:608)
at net.minecraft.server.MinecraftServer.z(SourceFile:532)
at cyk.z(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:448)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.8.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 276317752 bytes (263 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qx['Motorblade'/265, l='Boom', x=-204.73, y=106.37, z=151.70]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.