Ok. I got this huge bug. Here it is:

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 8/19/14 2:55 PM
Description: Ticking entity

java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.grow(Unknown Source)
at java.util.ArrayList.ensureExplicitCapacity(Unknown Source)
at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at aji.a(SourceFile:598)
at ahb.a(SourceFile:958)
at sa.d(SourceFile:502)
at zf.h(SourceFile:83)
at ahb.a(SourceFile:1368)
at ahb.g(SourceFile:1346)
at ahb.h(SourceFile:1253)
at bao.p(SourceFile:1552)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

– Head –
Stacktrace:
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.grow(Unknown Source)
at java.util.ArrayList.ensureExplicitCapacity(Unknown Source)
at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at aji.a(SourceFile:598)
at ahb.a(SourceFile:958)
at sa.d(SourceFile:502)
at zf.h(SourceFile:83)
at ahb.a(SourceFile:1368)
at ahb.g(SourceFile:1346)

– Entity being ticked –
Details:
Entity Type: FireworksRocketEntity (zf)
Entity ID: 2112
Entity Name: entity.FireworksRocketEntity.name
Entity's Exact location: -29772607.71, 323.35, 734.13
Entity's Block location: World: (-29772608,323,734), Chunk: (at 0,20,14 in -1860788,45; contains blocks -29772608,0,720 to -29772593,255,735), Region: (-58150,1; contains chunks -1860800,32 to -1860769,63, blocks -29772800,0,512 to -29772289,255,1023)
Entity's Momentum: -4465527.48, 4.80, 0.00
Stacktrace:
at ahb.h(SourceFile:1253)

– Affected level –
Details:
Level name: MpServer
All players: 7 total; [bjk['mkezar'/48967, l='MpServer', x=-2435.62, y=24.62, z=744.04], bll['SixthSense91'/72, l='MpServer', x=-2426.70, y=23.00, z=741.38], bll['FlowerPowerCraft'/76, l='MpServer', x=-2411.66, y=17.00, z=725.50], bll['xXH34DSH07Xx'/63, l='MpServer', x=-2413.43, y=16.97, z=713.93], bll['supakoda'/73, l='MpServer', x=-2425.47, y=20.64, z=739.18], bll['creepercrushr'/70, l='MpServer', x=-2425.54, y=23.00, z=740.24], bll['rambux'/65, l='MpServer', x=-2443.95, y=23.16, z=745.91]]
Chunk stats: MultiplayerChunkCache: 441, 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-2472,36,743), Chunk: (at 8,2,7 in -155,46; contains blocks -2480,0,736 to -2465,255,751), Region: (-5,1; contains chunks -160,32 to -129,63, blocks -2560,0,512 to -2049,255,1023)
Level time: 5823269 game time, 7565 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 169 total; [wi['§c-10'/2202, l='MpServer', x=-2413.94, y=73.73, z=717.28], zp['entity.WitherSkull.name'/2203, l='MpServer', x=-2413.94, y=73.50, z=717.28], wi['§c-33'/2196, l='MpServer', x=-2444.50, y=79.64, z=742.06], zp['entity.WitherSkull.name'/2197, l='MpServer', x=-2444.50, y=79.41, z=742.06], wi['§c-10'/2198, l='MpServer', x=-2413.03, y=73.64, z=716.22], zp['entity.WitherSkull.name'/2199, l='MpServer', x=-2413.03, y=73.41, z=716.22], zp['entity.WitherSkull.name'/2185, l='MpServer', x=-2444.75, y=78.44, z=740.66], wi['§c-33'/2184, l='MpServer', x=-2444.75, y=78.67, z=740.66], bll['xXH34DSH07Xx'/63, l='MpServer', x=-2413.43, y=16.97, z=713.93], zp['entity.WitherSkull.name'/2181, l='MpServer', x=-2412.00, y=73.03, z=715.63], wi['§c-10'/2180, l='MpServer', x=-2412.00, y=73.27, z=715.63], zp['entity.WitherSkull.name'/2226, l='MpServer', x=-2412.81, y=73.59, z=716.22], bll['creepercrushr'/70, l='MpServer', x=-2413.67, y=23.06, z=745.04], wi['§c-10'/2225, l='MpServer', x=-2412.81, y=73.83, z=716.22], wi['§c-33'/2228, l='MpServer', x=-2434.13, y=79.45, z=744.91], zp['entity.WitherSkull.name'/2229, l='MpServer', x=-2434.13, y=79.22, z=744.91], zp['entity.WitherSkull.name'/2219, l='MpServer', x=-2413.41, y=73.13, z=719.03], wi['§c-10'/2218, l='MpServer', x=-2413.41, y=73.36, z=719.03], bll['rambux'/65, l='MpServer', x=-2412.97, y=17.00, z=725.97], bll['SixthSense91'/72, l='MpServer', x=-2426.70, y=23.00, z=741.38], bll['xXH34DSH07Xx'/63, l='MpServer', x=-2413.43, y=16.97, z=713.93], bll['xXH34DSH07Xx'/63, l='MpServer', x=-2426.00, y=17.00, z=729.51], wi['§c-20'/2270, l='MpServer', x=-2424.53, y=79.80, z=741.28], bll['creepercrushr'/70, l='MpServer', x=-2425.54, y=23.00, z=740.24], zp['entity.WitherSkull.name'/2271, l='MpServer', x=-2424.53, y=79.56, z=741.28], bll['rambux'/65, l='MpServer', x=-2443.95, y=23.16, z=745.91], wi['§c-20'/2266, l='MpServer', x=-2424.56, y=79.23, z=740.81], zp['entity.WitherSkull.name'/2267, l='MpServer', x=-2424.56, y=79.00, z=740.81], bll['FlowerPowerCraft'/76, l='MpServer', x=-2411.66, y=17.00, z=725.50], zg['Fireball'/2263, l='MpServer', x=-2415.55, y=22.49, z=742.12], zg['Fireball'/2256, l='MpServer', x=-2412.70, y=15.76, z=742.09], bll['SixthSense91'/72, l='MpServer', x=-2426.70, y=23.00, z=741.38], bll['supakoda'/73, l='MpServer', x=-2425.47, y=20.64, z=739.18], bll['CrinklyEight311'/74, l='MpServer', x=-2420.63, y=17.41, z=728.58], bll['CrinklyEight311'/74, l='MpServer', x=-2419.75, y=18.00, z=727.91], zp['entity.WitherSkull.name'/2251, l='MpServer', x=-2430.66, y=80.47, z=743.47], wi['§c-33'/2250, l='MpServer', x=-2430.66, y=80.70, z=743.47], bll['creepercrushr'/70, l='MpServer', x=-2435.95, y=23.65, z=743.44], bll['SixthSense91'/72, l='MpServer', x=-2433.79, y=23.50, z=740.77], wi['§c-33'/2290, l='MpServer', x=-2425.19, y=19.22, z=738.22], zp['entity.WitherSkull.name'/2291, l='MpServer', x=-2425.19, y=74.22, z=738.22], wi['§c-20'/2288, l='MpServer', x=-2425.81, y=21.38, z=739.28], zp['entity.WitherSkull.name'/2289, l='MpServer', x=-2425.81, y=76.38, z=739.28], zp['entity.WitherSkull.name'/2283, l='MpServer', x=-2423.56, y=79.06, z=740.44], wi['§c-20'/2282, l='MpServer', x=-2423.56, y=79.30, z=740.44], zp['entity.WitherSkull.name'/2273, l='MpServer', x=-2423.88, y=78.91, z=740.44], wi['§c-95'/2272, l='MpServer', x=-2423.88, y=79.14, z=740.44], wi['§c-10'/2032, l='MpServer', x=-2414.56, y=73.77, z=725.03], zg['Fireball'/2065, l='MpServer', x=-2165.29, y=-57.19, z=432.15], zp['entity.WitherSkull.name'/2033, l='MpServer', x=-2414.56, y=73.53, z=725.03], zg['Fireball'/2064, l='MpServer', x=-2792.06, y=-50.98, z=635.72], wi['§a+50'/2034, l='MpServer', x=-2423.63, y=79.33, z=735.59], zp['entity.WitherSkull.name'/2035, l='MpServer', x=-2423.63, y=79.09, z=735.59], wi['§c-10'/2036, l='MpServer', x=-2411.00, y=73.61, z=727.38], zp['entity.WitherSkull.name'/2037, l='MpServer', x=-2411.00, y=73.38, z=727.38], wi['§c-10'/2048, l='MpServer', x=-2412.63, y=73.77, z=726.69], zp['entity.WitherSkull.name'/2049, l='MpServer', x=-2412.63, y=73.53, z=726.69], wi['§c-10'/2050, l='MpServer', x=-2413.69, y=73.08, z=725.22], zp['entity.WitherSkull.name'/2051, l='MpServer', x=-2413.69, y=72.84, z=725.22], wi['§c-33'/2052, l='MpServer', x=-2412.78, y=73.64, z=724.72], zp['entity.WitherSkull.name'/2053, l='MpServer', x=-2412.78, y=73.41, z=724.72], wi['§c-10'/2023, l='MpServer', x=-2408.69, y=73.14, z=728.13], wi['§c-5'/2054, l='MpServer', x=-2413.91, y=73.77, z=726.03], zp['entity.WitherSkull.name'/2055, l='MpServer', x=-2413.91, y=73.53, z=726.03], wi['§a+50'/2056, l='MpServer', x=-2423.78, y=79.64, z=735.28], zp['entity.WitherSkull.name'/2024, l='MpServer', x=-2408.69, y=72.91, z=728.13], zp['entity.WitherSkull.name'/2057, l='MpServer', x=-2423.78, y=79.41, z=735.28], wi['§c-10'/2058, l='MpServer', x=-2411.13, y=73.27, z=723.66], zp['entity.WitherSkull.name'/2059, l='MpServer', x=-2411.13, y=73.03, z=723.66], wi['§c-33'/2060, l='MpServer', x=-2411.63, y=73.64, z=728.50], zp['entity.WitherSkull.name'/2061, l='MpServer', x=-2411.63, y=73.41, z=728.50], zp['entity.WitherSkull.name'/2031, l='MpServer', x=-2412.97, y=73.34, z=726.88], wi['§a+50'/2062, l='MpServer', x=-2423.91, y=78.83, z=735.28], wi['§c-5'/2030, l='MpServer', x=-2412.97, y=73.58, z=726.88], zp['entity.WitherSkull.name'/2063, l='MpServer', x=-2423.91, y=78.59, z=735.28], zp['entity.WitherSkull.name'/2097, l='MpServer', x=-2409.38, y=73.53, z=724.97], wi['§c-95'/2096, l='MpServer', x=-2409.38, y=73.77, z=724.97], bll['CrinklyEight311'/74, l='MpServer', x=-2423.87, y=17.00, z=730.54], zp['entity.WitherSkull.name'/2103, l='MpServer', x=-2416.75, y=72.66, z=732.53], bll['FlowerPowerCraft'/76, l='MpServer', x=-2406.78, y=17.00, z=729.44], wi['§c-33'/2102, l='MpServer', x=-2416.75, y=72.89, z=732.53], bjk['mkezar'/48967, l='MpServer', x=-2435.62, y=24.62, z=744.04], bll['supakoda'/73, l='MpServer', x=-2415.53, y=17.00, z=723.34], zp['entity.WitherSkull.name'/2010, l='MpServer', x=-2412.81, y=73.41, z=726.63], bll['FlowerPowerCraft'/76, l='MpServer', x=-2411.66, y=17.00, z=725.50], zp['entity.WitherSkull.name'/2107, l='MpServer', x=-2417.16, y=73.22, z=732.00], wi['§c-20'/2106, l='MpServer', x=-2417.16, y=73.45, z=732.00], zp['entity.WitherSkull.name'/2105, l='MpServer', x=-2423.28, y=78.81, z=735.28], wi['§c-10'/2009, l='MpServer', x=-2412.81, y=73.64, z=726.63], wi['§a+50'/2104, l='MpServer', x=-2423.28, y=79.05, z=735.28], zp['entity.WitherSkull.name'/2111, l='MpServer', x=-2419.63, y=72.78, z=731.31], wi['§c-33'/2110, l='MpServer', x=-2419.63, y=73.02, z=731.31], zp['entity.WitherSkull.name'/2109, l='MpServer', x=-2410.03, y=73.31, z=716.97], wi['§c-10'/2108, l='MpServer', x=-2410.03, y=73.55, z=716.97], zp['entity.WitherSkull.name'/1987, l='MpServer', x=-2434.75, y=79.59, z=744.03], wi['§c-400'/1986, l='MpServer', x=-2434.75, y=79.83, z=744.03], zp['entity.WitherSkull.name'/1984, l='MpServer', x=-2423.44, y=79.13, z=735.28], xk['item.tile.ice'/1990, l='MpServer', x=-2434.85, y=23.13, z=743.79], xk['item.tile.ice'/1989, l='MpServer', x=-2433.74, y=23.13, z=744.03], xk['item.tile.ice'/1988, l='MpServer', x=-2435.55, y=23.13, z=746.22], xj['Falling Block'/2133, l='MpServer', x=-2403.50, y=18.99, z=736.01], xj['Falling Block'/2132, l='MpServer', x=-2402.50, y=18.49, z=730.50], xj['Falling Block'/2135, l='MpServer', x=-2409.49, y=17.49, z=740.50], xj['Falling Block'/2134, l='MpServer', x=-2408.50, y=17.49, z=739.50], zg['Fireball'/2129, l='MpServer', x=-2168.54, y=-53.57, z=617.45], zp['entity.WitherSkull.name'/2128, l='MpServer', x=-2425.38, y=73.28, z=730.19], zp['entity.WitherSkull.name'/2131, l='MpServer', x=-2413.06, y=73.34, z=716.03], bll['rambux'/65, l='MpServer', x=-2443.95, y=23.16, z=745.91], wi['§c-105'/2130, l='MpServer', x=-2413.06, y=73.58, z=716.03], xj['Falling Block'/2141, l='MpServer', x=-2439.51, y=17.49, z=723.49], xj['Falling Block'/2140, l='MpServer', x=-2445.51, y=17.49, z=730.50], xj['Falling Block'/2143, l='MpServer', x=-2421.28, y=17.49, z=725.25], xj['Falling Block'/2142, l='MpServer', x=-2442.51, y=17.49, z=725.50], wi['§a+50'/1983, l='MpServer', x=-2423.44, y=79.36, z=735.28], xj['Falling Block'/2137, l='MpServer', x=-2428.51, y=16.49, z=743.50], xj['Falling Block'/2136, l='MpServer', x=-2417.50, y=17.49, z=742.50], xj['Falling Block'/2139, l='MpServer', x=-2440.51, y=17.49, z=739.51], xj['Falling Block'/2138, l='MpServer', x=-2422.50, y=16.49, z=748.51], zp['entity.WitherSkull.name'/2116, l='MpServer', x=-2410.78, y=72.63, z=715.56], zg['Fireball'/2117, l='MpServer', x=-2682.37, y=-39.11, z=849.13], wt['Iron Golem'/2118, l='MpServer', x=-2418.28, y=17.00, z=730.63], wi['§c-20'/2119, l='MpServer', x=-2423.41, y=72.89, z=730.38], zf['entity.FireworksRocketEntity.name'/2112, l='MpServer', x=-29772607.71, y=323.35, z=734.13], wi['§a+400'/2113, l='MpServer', x=-2423.63, y=79.70, z=735.31], zp['entity.WitherSkull.name'/2114, l='MpServer', x=-2423.63, y=79.47, z=735.31], wi['§c-10'/2115, l='MpServer', x=-2410.78, y=72.86, z=715.56], zp['entity.WitherSkull.name'/2124, l='MpServer', x=-2424.53, y=72.94, z=730.22], wi['§c-10'/2125, l='MpServer', x=-2413.16, y=73.27, z=715.00], zp['entity.WitherSkull.name'/2126, l='MpServer', x=-2413.16, y=73.03, z=715.00], wi['§c-20'/2127, l='MpServer', x=-2425.38, y=73.52, z=730.19], bll['xXH34DSH07Xx'/63, l='MpServer', x=-2410.40, y=17.00, z=727.53], zp['entity.WitherSkull.name'/2120, l='MpServer', x=-2423.41, y=72.66, z=730.38], wi['§c-10'/2121, l='MpServer', x=-2412.22, y=72.98, z=714.16], zp['entity.WitherSkull.name'/2122, l='MpServer', x=-2412.22, y=72.75, z=714.16], wi['§c-33'/2123, l='MpServer', x=-2424.53, y=73.17, z=730.22], zp['entity.WitherSkull.name'/2167, l='MpServer', x=-2414.84, y=73.03, z=714.50], bll['supakoda'/73, l='MpServer', x=-2425.47, y=20.64, z=739.18], wi['§c-10'/2166, l='MpServer', x=-2414.84, y=73.27, z=714.50], zp['entity.WitherSkull.name'/2165, l='MpServer', x=-2435.72, y=73.66, z=730.91], wi['§c-33'/2164, l='MpServer', x=-2435.72, y=73.89, z=730.91], zp['entity.WitherSkull.name'/2163, l='MpServer', x=-2413.06, y=73.31, z=715.91], wi['§c-10'/2162, l='MpServer', x=-2413.06, y=73.55, z=715.91], xk['item.tile.ice'/2161, l='MpServer', x=-2432.50, y=17.13, z=731.52], xk['item.tile.ice'/2160, l='MpServer', x=-2431.45, y=17.13, z=730.16], zp['entity.WitherSkull.name'/2175, l='MpServer', x=-2442.03, y=73.59, z=733.69], wi['§c-33'/2174, l='MpServer', x=-2442.03, y=73.83, z=733.69], bll['creepercrushr'/70, l='MpServer', x=-2424.41, y=23.00, z=735.53], zp['entity.WitherSkull.name'/2173, l='MpServer', x=-2412.59, y=73.34, z=716.56], wi['§c-105'/2172, l='MpServer', x=-2412.59, y=73.58, z=716.56], zg['Fireball'/2171, l='MpServer', x=-2260.00, y=-21.94, z=823.32], zp['entity.WitherSkull.name'/2170, l='MpServer', x=-2414.84, y=73.44, z=714.44], wi['§c-105'/2169, l='MpServer', x=-2414.84, y=73.67, z=714.44], zg['Fireball'/2168, l='MpServer', x=-2565.51, y=-10.04, z=582.09], zp['entity.WitherSkull.name'/2150, l='MpServer', x=-2412.31, y=72.91, z=715.16], wi['§c-10'/2151, l='MpServer', x=-2412.34, y=73.77, z=715.16], wi['§c-95'/2149, l='MpServer', x=-2412.31, y=73.14, z=715.16], xj['Falling Block'/2146, l='MpServer', x=-2406.50, y=18.49, z=723.50], xj['Falling Block'/2147, l='MpServer', x=-2403.50, y=18.49, z=726.50], xj['Falling Block'/2144, l='MpServer', x=-2417.50, y=18.49, z=724.28], xj['Falling Block'/2145, l='MpServer', x=-2410.49, y=17.49, z=722.50], zp['entity.WitherSkull.name'/2158, l='MpServer', x=-2432.28, y=73.53, z=730.53], bll['creepercrushr'/70, l='MpServer', x=-2425.54, y=23.00, z=740.24], xk['item.tile.ice'/2159, l='MpServer', x=-2434.14, y=17.13, z=730.02], zp['entity.WitherSkull.name'/2156, l='MpServer', x=-2429.91, y=73.41, z=731.03], wi['§c-400'/2157, l='MpServer', x=-2432.28, y=73.77, z=730.53], zp['entity.WitherSkull.name'/2154, l='MpServer', x=-2414.50, y=72.66, z=713.47], wi['§c-33'/2155, l='MpServer', x=-2429.91, y=73.64, z=731.03], zp['entity.WitherSkull.name'/2152, l='MpServer', x=-2412.34, y=73.53, z=715.16], wi['§c-10'/2153, l='MpServer', x=-2414.50, y=72.89, z=713.47]]
Retry entities: 0 total; []
Server brand: CraftBukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bjf.a(SourceFile:289)
at bao.b(SourceFile:1972)
at bao.f(SourceFile:737)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 30490080 bytes (29 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
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

This happened while i was on a server so im not sure if it is spigot/bukkits side or if it is minecrafts side.