{"action":"created","issue":{"url":"https://api.github.com/repos/PaperMC/Paper/issues/113","repository_url":"https://api.github.com/repos/PaperMC/Paper","labels_url":"https://api.github.com/repos/PaperMC/Paper/issues/113/labels{/name}","comments_url":"https://api.github.com/repos/PaperMC/Paper/issues/113/comments","events_url":"https://api.github.com/repos/PaperMC/Paper/issues/113/events","html_url":"https://github.com/PaperMC/Paper/issues/113","id":142183988,"number":113,"title":"server crash still occurring","user":{"login":"PhanaticD","id":2024109,"avatar_url":"https://avatars.githubusercontent.com/u/2024109?v=3","gravatar_id":"","url":"https://api.github.com/users/PhanaticD","html_url":"https://github.com/PhanaticD","followers_url":"https://api.github.com/users/PhanaticD/followers","following_url":"https://api.github.com/users/PhanaticD/following{/other_user}","gists_url":"https://api.github.com/users/PhanaticD/gists{/gist_id}","starred_url":"https://api.github.com/users/PhanaticD/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/PhanaticD/subscriptions","organizations_url":"https://api.github.com/users/PhanaticD/orgs","repos_url":"https://api.github.com/users/PhanaticD/repos","events_url":"https://api.github.com/users/PhanaticD/events{/privacy}","received_events_url":"https://api.github.com/users/PhanaticD/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2016-03-20T17:29:11Z","updated_at":"2016-03-21T16:24:38Z","closed_at":"2016-03-20T19:25:45Z","body":"```\r\n[13:22:50] [Server thread/ERROR]: Encountered an unexpected exception\r\nnet.minecraft.server.v1_9_R1.ReportedException: Exception ticking world\r\n    at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:842) ~[patched_1.9.jar:git-Paper-531]\r\n    at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:404) ~[patched_1.9.jar:git-Paper-531]\r\n    at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:714) ~[patched_1.9.jar:git-Paper-531]\r\n    at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:613) [patched_1.9.jar:git-Paper-531]\r\n    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]\r\nCaused by: java.util.ConcurrentModificationException\r\n    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_74]\r\n    at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_74]\r\n    at net.minecraft.server.v1_9_R1.PlayerChunkMap.flush(PlayerChunkMap.java:119) ~[patched_1.9.jar:git-Paper-531]\r\n    at net.minecraft.server.v1_9_R1.WorldServer.doTick(WorldServer.java:253) ~[patched_1.9.jar:git-Paper-531]\r\n    at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:831) ~[patched_1.9.jar:git-Paper-531]\r\n    ... 4 more\r\n\r\n```\r\nhttps://github.com/PaperMC/Paper/issues/86"},"comment":{"url":"https://api.github.com/repos/PaperMC/Paper/issues/comments/199365114","html_url":"https://github.com/PaperMC/Paper/issues/113#issuecomment-199365114","issue_url":"https://api.github.com/repos/PaperMC/Paper/issues/113","id":199365114,"user":{"login":"aikar","id":58008,"avatar_url":"https://avatars.githubusercontent.com/u/58008?v=3","gravatar_id":"","url":"https://api.github.com/users/aikar","html_url":"https://github.com/aikar","followers_url":"https://api.github.com/users/aikar/followers","following_url":"https://api.github.com/users/aikar/following{/other_user}","gists_url":"https://api.github.com/users/aikar/gists{/gist_id}","starred_url":"https://api.github.com/users/aikar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/aikar/subscriptions","organizations_url":"https://api.github.com/users/aikar/orgs","repos_url":"https://api.github.com/users/aikar/repos","events_url":"https://api.github.com/users/aikar/events{/privacy}","received_events_url":"https://api.github.com/users/aikar/received_events","type":"User","site_admin":false},"created_at":"2016-03-21T16:24:38Z","updated_at":"2016-03-21T16:24:38Z","body":"@Techcable checking if main thread isn't a cheap operation. It involves a system call.\r\n\r\nBetter to only put them where we know things are happening on a case by case basis."}}