This should not be a duplicate of MC-64117 as this report here describes all the resulting problems, bugs and crashes of a overloaded world while MC-64117 describes the bug that you can open a Minecraft world twice with the same Minecraft instance
I hope this is not invalid or at least even when it is, it shows some small bugs in Minecraft when the game is overloaded.
When you open the world you will get first these messages:
[13:01:33 INFO]: Client> java.lang.Exception: Stack trace
[13:01:33 INFO]: Client> at java.lang.Thread.dumpStack(Unknown Source)
[13:01:33 INFO]: Client> at bed.a(SourceFile:641)
[13:01:33 INFO]: Client> at bet.a(SourceFile:333)
[13:01:33 INFO]: Client> at bet.a(SourceFile:95)
[13:01:33 INFO]: Client> at bet.a(SourceFile:83)
[13:01:33 INFO]: Client> at qk.e(SourceFile:133)
[13:01:33 INFO]: Client> at qk.c(SourceFile:85)
[13:01:33 INFO]: Client> at qj.<init>(SourceFile:39)
[13:01:33 INFO]: Client> at qi.a(SourceFile:231)
[13:01:33 INFO]: Client> at qi.d(SourceFile:370)
[13:01:33 INFO]: Client> at sf.d(SourceFile:285)
[13:01:33 INFO]: Client> at rb.a(SourceFile:313)
[13:01:33 INFO]: Client> at mc.a(SourceFile:126)
[13:01:33 INFO]: Client> at md.a(SourceFile:57)
[13:01:33 INFO]: Client> at ie.run(SourceFile:13)
[13:01:33 INFO]: Client> at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[13:01:33 INFO]: Client> at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
[13:01:33 INFO]: Client> at java.util.concurrent.FutureTask.run(Unknown Source)
[13:01:33 INFO]: Client> at net.minecraft.server.MinecraftServer.y(SourceFile:574)
[13:01:33 INFO]: Client> at net.minecraft.server.MinecraftServer.x(SourceFile:529)
[13:01:33 INFO]: Client> at cwp.x(SourceFile:144)
[13:01:33 INFO]: Client> at net.minecraft.server.MinecraftServer.run(SourceFile:445)
[13:01:33 INFO]: Client> at java.lang.Thread.run(Unknown Source)
[13:01:43 INFO]: Client> [13:01:43] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:43 INFO]: Client> [13:01:43] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44 INFO]: Client> [13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:52 INFO]: Client> [13:01:52] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:52 INFO]: Client> [13:01:52] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:52 INFO]: Client> [13:01:52] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:52 INFO]: Client> [13:01:52] [Client thread/ERROR]: Item entity 27748 has no item?!
############################################################
[12:56:43 INFO]: Client> [12:56:43] [Server thread/ERROR]: Couldn't process command: 'execute @e ~ ~ ~ detect ~ ~-1 ~ tnt 0 /setblock ~ ~ ~ fire'
[12:56:43 INFO]: Client> java.lang.NullPointerException
############################################################
[12:56:39 INFO]: Client> [12:56:39] [Server thread/ERROR]: Couldn't process command: 'execute @e ~ ~ ~ detect ~ ~-1 ~ tnt 0 /setblock ~ ~ ~ fire'
[12:56:39 INFO]: Client> java.lang.NullPointerException
[12:56:39 INFO]: Client> at z.a(SourceFile:161) ~[14w30c.jar:?]
[12:56:39 INFO]: Client> at bk.b(SourceFile:43) ~[14w30c.jar:?]
[12:56:39 INFO]: Client> at ab.a(SourceFile:79) [14w30c.jar:?]
[12:56:39 INFO]: Client> at ab.a(SourceFile:55) [14w30c.jar:?]
[12:56:39 INFO]: Client> at apm.a(SourceFile:98) [14w30c.jar:?]
[12:56:39 INFO]: Client> at atr.c(SourceFile:53) [14w30c.jar:?]
[12:56:39 INFO]: Client> at ql.a(SourceFile:518) [14w30c.jar:?]
[12:56:39 INFO]: Client> at ql.c(SourceFile:199) [14w30c.jar:?]
[12:56:39 INFO]: Client> at net.minecraft.server.MinecraftServer.y(SourceFile:597) [14w30c.jar:?]
[12:56:39 INFO]: Client> at net.minecraft.server.MinecraftServer.x(SourceFile:529) [14w30c.jar:?]
[12:56:39 INFO]: Client> at cwp.x(SourceFile:144) [14w30c.jar:?]
[12:56:39 INFO]: Client> at net.minecraft.server.MinecraftServer.run(SourceFile:445) [14w30c.jar:?]
[12:56:39 INFO]: Client> at java.lang.Thread.run(Unknown Source) [?:1.6.0_45]And then it could even happen that the world crashes
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It is not, here I am describing the fact that overloaded worlds cause a lot of bugs and crashes, in MC-64117 I say that it is possible to open a world twice with the same instance of Minecraft which leads to a crash
You can close this, I will not maintain it anymore as the circumstances for this bug were pretty extreme
Your Java version is out of date!
On Windows, you can use the Minecraft Installer which includes the latest version of Java.
Otherwise, please manually update your Java to the latest version: http://www.java.com/en/download/.
It is recommended you uninstall any outdated versions prior to upgrading.
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.
Please report if the issue persists with the latest Java version.
For technical support please use the Mojang Support Center.
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Never duplicate your own tickets.
Duplicate of MC-64117