Minecraft Forums

ok so here's what happened. Me and my friends like to hang out together and open lan worlds at our school. We have school issued laptops and we all play minecraft on the network and it has worked fine up to now. we don't use mods or anything. Recently though we started to work on a RPG towny lan world and we all started playing. But as soon as we started finishing it up it started lagging alot and now when over 2 people join my minecraft freezes. Anyone have any suggestions on how to fix this?

here is the crash report


---------------------

Minecraft has stopped running because it encountered a problem; Ticking entity

A full error report has been saved to /Users/16BOLEST/Library/Application Support/minecraft/crash-reports/crash-2012-12-14_13.11.26-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT a1c25271 --------
Full report at:
/Users/16BOLEST/Library/Application Support/minecraft/crash-reports/crash-2012-12-14_13.11.26-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 12/14/12 1:11 PM

-- Head --
Stacktrace:
at du.<init>(SourceFile:64)
at iq.j_(SourceFile:161)
at xv.a(SourceFile:1317)
at in.a(SourceFile:451)
at xv.g(SourceFile:1296)

-- Entity being ticked --
Details:
Entity Type: null (iq)
Entity ID: 328
Name: TronNEO
Exact location: -18.16, 51.00, 40.17
Block location: World: (-19,51,40), Chunk: (at 13,3,8 in -2,2; contains blocks -32,0,32 to -17,255,47), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Momentum: 0.00, -0.08, 0.00
Stacktrace:
at xv.h(SourceFile:1195)
at in.h(SourceFile:363)

-- Affected level --
Details:
Level name: RPG LAN WORLD 1.4.5
All players: 1 total; [iq['TronNEO'/328, l='RPG LAN WORLD 1.4.5', x=-18.16, y=51.00, z=40.17]]
Chunk stats: ServerChunkCache: 441 Drop: 0
Level seed: 4066647039672185058
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 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: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:751)
at net.minecraft.server.MinecraftServer.q(SourceFile:686)
at bdo.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:620)
at fy.run(SourceFile:856)

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_29, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 516112 bytes (0 MB) / 129957888 bytes (123 MB) up to 129957888 bytes (123 MB)
JVM Flags: 0 total;
AABB Pool Size: 5158 (288848 bytes; 0 MB) allocated, 3567 (199752 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1446 (80976 bytes; 0 MB) allocated, 1391 (77896 bytes; 0 MB) used
Player Count: 1 / 8; [iq['TronNEO'/328, l='RPG LAN WORLD 1.4.5', x=-18.16, y=51.00, z=40.17]]
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated

java.lang.OutOfMemoryError: Java heap space
at du.<init>(SourceFile:64)
at iq.j_(SourceFile:161)
at xv.a(SourceFile:1317)
at in.a(SourceFile:451)
at xv.g(SourceFile:1296)
at xv.h(SourceFile:1195)
at in.h(SourceFile:363)
at net.minecraft.server.MinecraftServer.r(SourceFile:751)
at net.minecraft.server.MinecraftServer.q(SourceFile:686)
at bdo.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:620)
at fy.run(SourceFile:856)
--- END ERROR REPORT 39a8741e ----------

Im guessing its your schools internet bandwidth. Many schools (Along with mine) have crappy internet and you really cant do anything about it.

Play them in your house, school sometime block some incoming connecting on social stuff.