Sometimes when there are huge terraforming tasks (e.g. via Bukkit plugins like WorldEdit) the client crashes with a error log like the following.
It is not based on the plugins I think, because tried several ones (I could be wrong, but don't think so). This bug even occurred in previous versions.
It is a freshly downloaded version of 1.4.5.
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Got same crash with same stack trace:
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-3339. If I am wrong, please go yell at Dinnerbone.