I'm running a minecraft server for 3 friends. It has been working fine for a week, but now crashed almost instantly when I join. Below is the low, but I dont really know what Im looking for or how to fix it. I have no mods installed.

---- Minecraft Crash Report ----
// Daisy, daisy...
Time: 1/12/16 10:22 PM
Description: Watching Server
java.lang.Error at adm.a(SourceFile:204) at adm.a(SourceFile:217) at adm.e(SourceFile:213) at adm.b(SourceFile:604) at adm.a(SourceFile:2083) at adm.c(SourceFile:2106) at adm.x(SourceFile:2053) at amy.e(SourceFile:1161) at amy.n(SourceFile:1094) at amy.b(SourceFile:916) at le.h(SourceFile:332) at le.c(SourceFile:202) at net.minecraft.server.MinecraftServer.B(SourceFile:599) at ko.B(SourceFile:299) at net.minecraft.server.MinecraftServer.A(SourceFile:535) at net.minecraft.server.MinecraftServer.run(SourceFile:451) at java.lang.Thread.run(Unknown Source)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace: at adm.a(SourceFile:204) at adm.a(SourceFile:217) at adm.e(SourceFile:213) at adm.b(SourceFile:604) at adm.a(SourceFile:2083) at adm.c(SourceFile:2106) at adm.x(SourceFile:2053) at amy.e(SourceFile:1161) at amy.n(SourceFile:1094) at amy.b(SourceFile:916) at le.h(SourceFile:332) at le.c(SourceFile:202) at net.minecraft.server.MinecraftServer.B(SourceFile:599) at ko.B(SourceFile:299) at net.minecraft.server.MinecraftServer.A(SourceFile:535)
-- Thread Dump --
Details: Threads: "Netty Server IO #2" Id=33 RUNNABLE at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method) at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source) at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source) at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source) at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source) - locked io.netty.channel.nio.SelectedSelectionKeySet@7ecb2fee - locked java.util.Collections$UnmodifiableSet@700cce47 - locked sun.nio.ch.WindowsSelectorImpl@7433449e at sun.nio.ch.SelectorImpl.select(Unknown Source) at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310) ...
"File IO Thread" Id=50 TIMED_WAITING at java.lang.Thread.sleep(Native Method) at auc.c(SourceFile:51) at auc.run(SourceFile:30) at java.lang.Thread.run(Unknown Source)
"Netty Server IO #1" Id=32 RUNNABLE (in native) at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method) at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source) at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source) at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source) at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source) - locked io.netty.channel.nio.SelectedSelectionKeySet@3131c47c - locked java.util.Collections$UnmodifiableSet@162229eb - locked sun.nio.ch.WindowsSelectorImpl@4ab39e at sun.nio.ch.SelectorImpl.select(Unknown Source) at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310) ...
"Server Watchdog" Id=48 RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) at sun.management.ThreadImpl.dumpAllThreads(Unknown Source) at kp.run(SourceFile:43) at java.lang.Thread.run(Unknown Source)
"Netty Server IO #0" Id=31 RUNNABLE (in native) at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method) at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source) at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source) at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source) at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source) - locked io.netty.channel.nio.SelectedSelectionKeySet@6eb300bd - locked java.util.Collections$UnmodifiableSet@511e3b33 - locked sun.nio.ch.WindowsSelectorImpl@56f43d8a at sun.nio.ch.SelectorImpl.select(Unknown Source) at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310) ...
"DestroyJavaVM" Id=29 RUNNABLE
"Server console handler" Id=28 RUNNABLE (in native) at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) - locked java.io.BufferedInputStream@3f7a289 at sun.nio.cs.StreamDecoder.readBytes(Unknown Source) at sun.nio.cs.StreamDecoder.implRead(Unknown Source) at sun.nio.cs.StreamDecoder.read(Unknown Source) - locked java.io.InputStreamReader@75b7eca2 at java.io.InputStreamReader.read(Unknown Source) ...
"Server thread" Id=26 RUNNABLE at adm.a(SourceFile:204) at adm.a(SourceFile:217) at adm.e(SourceFile:213) at adm.b(SourceFile:604) at adm.a(SourceFile:2083) at adm.c(SourceFile:2106) at adm.x(SourceFile:2053) at amy.e(SourceFile:1161) ...
"AWT-EventQueue-0" Id=23 RUNNABLE at sun.font.T2KFontScaler.getGlyphMetricsNative(Native Method) at sun.font.T2KFontScaler.getGlyphMetrics(Unknown Source) - locked sun.font.T2KFontScaler@55508684 at sun.font.FileFont.getGlyphMetrics(Unknown Source) at sun.font.FileFontStrike.getGlyphMetrics(Unknown Source) at sun.font.FileFontStrike.getGlyphAdvance(Unknown Source) at sun.font.FileFontStrike.getGlyphImageFromWindows(Unknown Source) at sun.font.FileFontStrike.getGlyphImageFromNative(Unknown Source) at sun.font.FileFontStrike.getGlyphImagePtr(Unknown Source) ...
"AWT-Shutdown" Id=24 WAITING on java.lang.Object@22bff9c9 at java.lang.Object.wait(Native Method) - waiting on java.lang.Object@22bff9c9 at java.lang.Object.wait(Unknown Source) at sun.awt.AWTAutoShutdown.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
"TimerQueue" Id=22 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@567ad92f at sun.misc.Unsafe.park(Native Method) - waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@567ad92f at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source) at java.util.concurrent.DelayQueue.take(Unknown Source) at javax.swing.TimerQueue.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Number of locked synchronizers = 1 - java.util.concurrent.locks.ReentrantLock$NonfairSync@1c62e4fd
"Thread-4" Id=21 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7cf11c2 at sun.misc.Unsafe.park(Native Method) - waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7cf11c2 at java.util.concurrent.locks.LockSupport.park(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source) at com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77) at kr$4.run(SourceFile:114) at java.lang.Thread.run(Unknown Source)
"AWT-Windows" Id=17 RUNNABLE (in native) at sun.awt.windows.WToolkit.eventLoop(Native Method) at sun.awt.windows.WToolkit.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
"Java2D Disposer" Id=15 WAITING on java.lang.ref.ReferenceQueue$Lock@5ae3c143 at java.lang.Object.wait(Native Method) - waiting on java.lang.ref.ReferenceQueue$Lock@5ae3c143 at java.lang.ref.ReferenceQueue.remove(Unknown Source) at java.lang.ref.ReferenceQueue.remove(Unknown Source) at sun.java2d.Disposer.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
"Server Infinisleeper" Id=14 TIMED_WAITING at java.lang.Thread.sleep(Native Method) at ko$1.run(SourceFile:65)
"Snooper Timer" Id=13 TIMED_WAITING on java.util.TaskQueue@512d93ee at java.lang.Object.wait(Native Method) - waiting on java.util.TaskQueue@512d93ee at java.util.TimerThread.mainLoop(Unknown Source) at java.util.TimerThread.run(Unknown Source)
"Attach Listener" Id=5 RUNNABLE
"Signal Dispatcher" Id=4 RUNNABLE
"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@511e8b45 at java.lang.Object.wait(Native Method) - waiting on java.lang.ref.ReferenceQueue$Lock@511e8b45 at java.lang.ref.ReferenceQueue.remove(Unknown Source) at java.lang.ref.ReferenceQueue.remove(Unknown Source) at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)
"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@2ea0d1a5 at java.lang.Object.wait(Native Method) - waiting on java.lang.ref.Reference$Lock@2ea0d1a5 at java.lang.Object.wait(Unknown Source) at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
Stacktrace: at kp.run(SourceFile:59) at java.lang.Thread.run(Unknown Source)
-- System Details --
Details: Minecraft Version: 1.8.9 Operating System: Windows Server 2012 R2 (amd64) version 6.3 Java Version: 1.8.0_65, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 1214620224 bytes (1158 MB) / 1401946112 bytes (1337 MB) up to 1908932608 bytes (1820 MB) JVM Flags: 2 total; -Xms1024M -Xmx2048M IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94 Profiler Position: N/A (disabled) Player Count: 1 / 20; [lf['negativesixtysix'/282, l='world', x=-61.52, y=81.00, z=-877.51]] Is Modded: Unknown (can't tell) Type: Dedicated Server (map_server.txt)

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1 Answer

This crash was caused by a feature called the server watchdog, which was added in 1.8. Its job is to shut the server down if a single server tick takes more than a configurable number of milliseconds (by default 60000, or 60 seconds).

You can work around this by setting max-tick-time in server.properties to a higher number, or to -1, to disable it entirely. See MC-63590 for more details.

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