Exception while updating neighbours

Your Java version is out of date. Please update your Java to the latest version (1.7.0_25): http://www.java.com/en/download/. Keep in mind that when using a 32-bit browser on a 64-bit OS 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.

I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod. You can view all information known about this specific crash at MCX-867.

This ticket is invalid as it relates to a modded or 3rd party client/server.

• Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.

• Any plugin issues need to be addressed to the plugin creator.

• This site is for addressing issues related to the base unmodded Minecraft.

This is most certainly NOT a modded server. This was running a raw minecraft_server.1.6.1.jar freshly downloaded from Mojang servers. I downloaded the raw Minecraft server in an attempt to see what the base level of the crash was, as the mod developer was saying it was not caused by their modded server build. I was able to reproduce the crash with just the raw client and server.

But the Java update did fix the issue. Why do you not support Java 6 any longer if the game is still compiled using Java 6?

Reopened. Sorry (I believed the bot)

I did update Java to openjdk 1.7.0_21 and this issue no longer occurs. If Java 6 is truly no longer supported, then this can be closed.

Java 6 is buggy. Things get broken in ancient version when most people are no longer using them.

I had the same problem and updating to the latest java didn't help, however I was using the java option "-Xss192k" which limits the stack size, apparently after the 1.6 update this size is too small.