Minecraft 1.11.2 server displays the "Can't Keep Up!" prompt only when i log in

#1 May 8, 2017

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So i am hosting a server for a small number of people, probably 5 at max using hamachi. The server is hosted from my Laptop with 4 GB of ram, an AMD-FX 7500 Radeon R7, and i run both my server and my minecraft client from the same laptop.

My friends can connect well to the server, but whenever i logged in to the server, the "Cant Keep Up!" Errors shows up and says the server is skipping some ticks, even when i connect through localhost, so this is obviously a fault with java, or my device. Sometimes it even made the server shut down, but the server GUI (when i still used it) shows that i am barely using the allocated memory

I am using a client with only optifine 1.11.2 HD U B7 Installed, with 1 gigs allocated for minecraft on the launch settings

On the server, i use a .bat file with the followin command : java -Xms1024M -Xmx1024M -jar minecraft_server.1.11.2.jar nogui

this couldnt be my laptop lacking in ram since i did run a server from before (around version 1.2.5 - the horse update) and it doesnt lag

i'm considering : updating java, and the LWJGL for my laptop

any pointers on what to do and how i trace down the cause of the error?

Thanks!

EDIT : I now provide the detailed error log after the crash, which apparently showed the mem usage spiked up to 936 MB out of 1022 MB allocated

---- Minecraft Crash Report ----
// There are four lights!

Time: 08/05/17 15:58
Description: Watching Server

java.lang.Error
	at ajs.E(SourceFile:231)
	at ajs.o(SourceFile:729)
	at sw.m_(SourceFile:1009)
	at sw.g(SourceFile:1571)
	at sw.n(SourceFile:1870)
	at sx.n(SourceFile:499)
	at sk.n(SourceFile:144)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at lh.D(SourceFile:335)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server Watchdog
Stacktrace:
	at ajs.E(SourceFile:231)
	at ajs.o(SourceFile:729)
	at sw.m_(SourceFile:1009)
	at sw.g(SourceFile:1571)
	at sw.n(SourceFile:1870)
	at sx.n(SourceFile:499)
	at sk.n(SourceFile:144)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at lh.D(SourceFile:335)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)

-- Thread Dump --
Details:
	Threads: "Netty Server IO #2" Id=30 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$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@4313f2cc
	-  locked java.util.Collections$UnmodifiableSet@4dd414de
	-  locked sun.nio.ch.WindowsSelectorImpl@49eb99bc
	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)
	...


"Netty Server IO #1" Id=29 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$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@ce91ee5
	-  locked java.util.Collections$UnmodifiableSet@50300826
	-  locked sun.nio.ch.WindowsSelectorImpl@3daf941a
	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=39 TIMED_WAITING
	at java.lang.Thread.sleep(Native Method)
	at bdp.c(SourceFile:51)
	at bdp.run(SourceFile:30)
	at java.lang.Thread.run(Unknown Source)


"Server Watchdog" Id=37 RUNNABLE
	at sun.management.ThreadImpl.dumpThreads0(Native Method)
	at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
	at li.run(SourceFile:43)
	at java.lang.Thread.run(Unknown Source)


"Netty Server IO #0" Id=28 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$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@289cdc6a
	-  locked java.util.Collections$UnmodifiableSet@6cc6e1aa
	-  locked sun.nio.ch.WindowsSelectorImpl@3c67b52c
	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)
	...


"D3D Screen Updater" Id=26 TIMED_WAITING on java.lang.Object@7da9f9fe
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.Object@7da9f9fe
	at sun.java2d.d3d.D3DScreenUpdateManager.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"Server console handler" Id=25 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@339815ad
	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@688879c5
	at java.io.InputStreamReader.read(Unknown Source)
	...


"DestroyJavaVM" Id=24 RUNNABLE


"Server thread" Id=22 RUNNABLE
	at ajs.E(SourceFile:231)
	at ajs.o(SourceFile:729)
	at sw.m_(SourceFile:1009)
	at sw.g(SourceFile:1571)
	at sw.n(SourceFile:1870)
	at sx.n(SourceFile:499)
	at sk.n(SourceFile:144)
	at sw.A_(SourceFile:1703)
	...


"TimerQueue" Id=20 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5b930df2
	at sun.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5b930df2
	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@69476f2d


"Thread-4" Id=19 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@28d55e50
	at sun.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@28d55e50
	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 lk$4.run(SourceFile:129)
	at java.lang.Thread.run(Unknown Source)


"AWT-EventQueue-0" Id=18 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@3b85cde
	at sun.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@3b85cde
	at java.util.concurrent.locks.LockSupport.park(Unknown Source)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
	at java.awt.EventQueue.getNextEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	...


"AWT-Windows" Id=16 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)


"AWT-Shutdown" Id=15 WAITING on java.lang.Object@51d47583
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.Object@51d47583
	at java.lang.Object.wait(Unknown Source)
	at sun.awt.AWTAutoShutdown.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"Java2D Disposer" Id=14 WAITING on java.lang.ref.ReferenceQueue$Lock@126b0ed6
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.ReferenceQueue$Lock@126b0ed6
	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=13 TIMED_WAITING
	at java.lang.Thread.sleep(Native Method)
	at lh$1.run(SourceFile:79)


"Snooper Timer" Id=12 TIMED_WAITING on java.util.TaskQueue@104ee515
	at java.lang.Object.wait(Native Method)
	-  waiting on java.util.TaskQueue@104ee515
	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$Lock@5151056e
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.ReferenceQueue$Lock@5151056e
	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$Lock@235b0aaa
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.Reference$Lock@235b0aaa
	at java.lang.Object.wait(Unknown Source)
	at java.lang.ref.Reference.tryHandlePending(Unknown Source)
	at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)



Stacktrace:
	at li.run(SourceFile:59)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.11.2
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_92, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 981496448 bytes (936 MB) / 1071644672 bytes (1022 MB) up to 1071644672 bytes (1022 MB)
	JVM Flags: 4 total; -Xmx1024M -Xms1024M -Xms1g -Xmx1g
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 5; [ly['UsamahJundiA'/318, l='world', x=14.68, y=68.00, z=339.75]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)

Last edited by AdmiralProudmoore: May 8, 2017

Hail the nutcracker queen

#3 May 10, 2017
Tom_The_Hero1
Tom_The_Hero1

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- Out of the Water
- Join Date: 4/14/2017
- Posts: 9
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It probebly has to load so much stuff when you log in that it can't keep up until it has loaded everything.

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