I recently did have some lag issues with my world - I'm not sure if it was just this world or if it was Minecraft because I really only play on this one world, but it happened after I switched around some .jar files - but the lag issues seemed to go away when I did a complete clean install.
However, I was on my world doing some work around my main base area and it suddenly crashed.
When I re-loaded Minecraft, I re-spawned in solid stone (but with my inventory intact). I figured that maybe it had displaced me a few blocks or something so I just dug up until I reached the surface, but when I returned to the area, it appears that the entire chunk had been overwritten to its original state! Luckily I didn't lose anything too important but it still wiped away a decent amount of work and I'm definitely upset about it.
So now I'm a bit paranoid about playing in this world because I'm worried that something could be corrupt and I definitely don't want it to happen again.
I HAVE NO MODS INSTALLED.
Sorry if this was covered somewhere already, I did do a quick search and didn't find this specific problem, and it says it's a memory problem but I'm not sure why a memory problem would cause world corruption like that. :/
---- Minecraft Crash Report ----
// Why is it breaking
java.lang.NullPointerException
at ur.f(SourceFile:129)
at ur.h(SourceFile:143)
at qw.a(SourceFile:219)
at px.c_(SourceFile:189)
at qx.r(SourceFile:388)
at qx.c(SourceFile:380)
at md.j_(SourceFile:540)
at qx.j_(SourceFile:200)
at iq.g(SourceFile:175)
at iv.a(SourceFile:199)
at eb.a(SourceFile:136)
at cf.b(SourceFile:55)
at iv.d(SourceFile:57)
at iw.b(SourceFile:39)
at bec.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_05, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 135294368 bytes (129 MB) / 512032768 bytes (488 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3611 (202216 bytes; 0 MB) allocated, 3482 (194992 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: 755 (42280 bytes; 0 MB) allocated, 719 (40264 bytes; 0 MB) used
Player Count: 1 / 8; [iq['bob_rulz'/5210377, l='The Builder', x=-22.79, y=71.00, z=365.57]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
The wiki says this was fixed in one of the snapshots. I'm still playing vanilla 1.4.7.
The reports about chunks being re-set is consistent with what happened to me...I'm just glad that my world doesn't appear to be corrupted at all. It still sucks that I lost everything in that chunk though.
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However, I was on my world doing some work around my main base area and it suddenly crashed.
When I re-loaded Minecraft, I re-spawned in solid stone (but with my inventory intact). I figured that maybe it had displaced me a few blocks or something so I just dug up until I reached the surface, but when I returned to the area, it appears that the entire chunk had been overwritten to its original state! Luckily I didn't lose anything too important but it still wiped away a decent amount of work and I'm definitely upset about it.
So now I'm a bit paranoid about playing in this world because I'm worried that something could be corrupt and I definitely don't want it to happen again.
I HAVE NO MODS INSTALLED.
Sorry if this was covered somewhere already, I did do a quick search and didn't find this specific problem, and it says it's a memory problem but I'm not sure why a memory problem would cause world corruption like that. :/
---- Minecraft Crash Report ----
// Why is it breaking
Time: 2/15/13 4:03 PM
Description: Ticking memory connection
java.lang.NullPointerException
at ur.f(SourceFile:129)
at ur.h(SourceFile:143)
at qw.a(SourceFile:219)
at px.c_(SourceFile:189)
at qx.r(SourceFile:388)
at qx.c(SourceFile:380)
at md.j_(SourceFile:540)
at qx.j_(SourceFile:200)
at iq.g(SourceFile:175)
at iv.a(SourceFile:199)
at eb.a(SourceFile:136)
at cf.b(SourceFile:55)
at iv.d(SourceFile:57)
at iw.b(SourceFile:39)
at bec.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_05, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 135294368 bytes (129 MB) / 512032768 bytes (488 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3611 (202216 bytes; 0 MB) allocated, 3482 (194992 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: 755 (42280 bytes; 0 MB) allocated, 719 (40264 bytes; 0 MB) used
Player Count: 1 / 8; [iq['bob_rulz'/5210377, l='The Builder', x=-22.79, y=71.00, z=365.57]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
It appears to be this bug:
https://mojang.atlassian.net/browse/MC-2711
The wiki says this was fixed in one of the snapshots. I'm still playing vanilla 1.4.7.
The reports about chunks being re-set is consistent with what happened to me...I'm just glad that my world doesn't appear to be corrupted at all. It still sucks that I lost everything in that chunk though.