Hey,

when I run MinecraftServer.getServer().stopServer() it crashes the server after saving so it won't completely shut down and stay online without letting anyone join.

 

Crash report: 

Spoiler

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 5/27/17 12:26 AM
Description: Watching Server

java.lang.Error
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.server.dedicated.DedicatedServer.func_71228_a(DedicatedServer.java:325)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:525)
    at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Stacktrace:
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.server.dedicated.DedicatedServer.func_71228_a(DedicatedServer.java:325)

-- Thread Dump --
Details:
    Threads: "File IO Thread" Id=54 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.world.storage.ThreadedFileIOBase.func_75736_b(SourceFile:51)
    at net.minecraft.world.storage.ThreadedFileIOBase.run(SourceFile:30)
    at java.lang.Thread.run(Thread.java:745)

"Chunk I/O Executor Thread-1" Id=53 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@462f4b4e
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@462f4b4e
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

"Netty Server IO #2" Id=26 RUNNABLE (in native)
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@48e8bdfb
    -  locked java.util.Collections$UnmodifiableSet@4cd7203e
    -  locked sun.nio.ch.EPollSelectorImpl@9d5b7c0
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:596)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:306)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
    ...

"Netty Server IO #1" Id=25 RUNNABLE (in native)
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@359ce88f
    -  locked java.util.Collections$UnmodifiableSet@38169ca2
    -  locked sun.nio.ch.EPollSelectorImpl@4db59d4e
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:596)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:306)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
    ...

"Server Watchdog" Id=48 RUNNABLE
    at sun.management.ThreadImpl.dumpThreads0(Native Method)
    at sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:454)
    at net.minecraft.server.dedicated.ServerHangWatchdog.run(SourceFile:43)
    at java.lang.Thread.run(Thread.java:745)

"Timer-0" Id=47 TIMED_WAITING on java.util.TaskQueue@69fa488f
    at java.lang.Object.wait(Native Method)
    -  waiting on java.util.TaskQueue@69fa488f
    at java.util.TimerThread.mainLoop(Timer.java:552)
    at java.util.TimerThread.run(Timer.java:505)

"Netty Server IO #0" Id=24 RUNNABLE (in native)
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    -  locked io.netty.channel.nio.SelectedSelectionKeySet@3b700daf
    -  locked java.util.Collections$UnmodifiableSet@370f75ef
    -  locked sun.nio.ch.EPollSelectorImpl@56b1d1ad
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:596)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:306)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
    ...

"Server console handler" Id=18 RUNNABLE (in native)
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:255)
    at java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
    -  locked java.io.BufferedInputStream@6db455c4
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
    -  locked java.io.InputStreamReader@561220a8
    at java.io.InputStreamReader.read(InputStreamReader.java:184)
    ...

"DestroyJavaVM" Id=17 RUNNABLE

"Server thread" Id=15 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.server.dedicated.DedicatedServer.func_71228_a(DedicatedServer.java:325)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:525)
    at java.lang.Thread.run(Thread.java:745)

"Server Infinisleeper" Id=14 TIMED_WAITING
    at java.lang.Thread.sleep(Native Method)
    at net.minecraft.server.dedicated.DedicatedServer$1.run(DedicatedServer.java:73)

"Signal Dispatcher" Id=4 RUNNABLE

"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@1a7e8788
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.ReferenceQueue$Lock@1a7e8788
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@429a11d3
    at java.lang.Object.wait(Native Method)
    -  waiting on java.lang.ref.Reference$Lock@429a11d3
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

Stacktrace:
    at net.minecraft.server.dedicated.ServerHangWatchdog.run(SourceFile:59)
    at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
    Minecraft Version: 1.8
    Operating System: Linux (amd64) version 4.10.13-1-ARCH
    Java Version: 1.8.0_121, Oracle Corporation
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 2967014088 bytes (2829 MB) / 3444572160 bytes (3285 MB) up to 5726797824 bytes (5461 MB)
    JVM Flags: 2 total; -Xmx6144M -Xms2048M
    IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
    FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.4.1563 7 mods loaded, 7 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCHIJAAAA    mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
    UCHIJAAAA    FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.4.1563-universal.jar) 
    UCHIJAAAA    Forge{11.14.4.1563} [Minecraft Forge] (forge-1.8-11.14.4.1563-universal.jar) 
    UCHIJAAAA    flansmod{@VERSION@} [Flan's Mod] (modid-1.0.jar) 
    UCHIJAAAA    flansmodapocalypse{1.0} [Flan's Mod: Apocalypse] (modid-1.0.jar) 
    UCHIJAAAA    mymod{0.1.1} [mymod] (modid-1.0.jar) 
    UCHIJAAAA    worldedit{6.1.1-SNAPSHOT} [WorldEdit] (worldedit-forge-mc1.8-6.1.1-SNAPSHOT-dist.jar) 
    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Player Count: 0 / 48; []
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

Do you know why this happens and is there a way to fix?

Thanks a lot

That seems to work. Thank you very much