snapshot 18w21a. Server Crashes continuiously

This ticket is invalid as it relates to a modified or third-party client, server, or launcher.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• This site is for addressing issues related to the base unmodded Minecraft; any modded system invalidates your ticket, unless the behavior can be reproduced without mods.

• Additionally, if you have problems on large-scale modded servers, please report it to their site. It's probably not a bug in Minecraft.

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This is not a legitimate response.  This is an unmodified version of Minecraft running on a server I control.

I'm not sure why @unknown thinks your game is modded. However, this still is an issue on your end: you ran out of memory, and I see it specified that you have -Xmx235M -Xms235M in your JVM args – i.e. 235 megabytes of memory. Increase that and the issue probably should be fixed.

I added memory and you can see the continued crash report below.

Minecraft Crash Report -------- Minecraft Crash Report ----// There are four lights!
Time: 5/23/18 10:33 AMDescription: Exception ticking world
java.lang.NullPointerException: Exception ticking world at bwi.a(SourceFile:186) at bwi.a(SourceFile:92) at bwm.d(SourceFile:60) at brt.a(SourceFile:298) at sj.a(SourceFile:307) at sk.a(SourceFile:249) at bbo.a(SourceFile:144) at sk.i_(SourceFile:199) at net.minecraft.server.MinecraftServer.w(SourceFile:694) at rv.w(SourceFile:365) at net.minecraft.server.MinecraftServer.v(SourceFile:627) at net.minecraft.server.MinecraftServer.run(SourceFile:532) 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 threadStacktrace: at bwi.a(SourceFile:186) at bwi.a(SourceFile:92) at bwm.d(SourceFile:60) at brt.a(SourceFile:298) at sj.a(SourceFile:307) at sk.a(SourceFile:249) at bbo.a(SourceFile:144) at sk.i_(SourceFile:199)
– Affected level --Details: Level name: Family Fun All players: 1 total; [sm['VirtualWandering'/384, l='Family Fun', x=-173.19, y=80.00, z=-161.87]] Chunk stats: ServerChunkCache: 370 Drop: 0 Level seed: -2134918553935009108 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (-32,64,-208), Chunk: (at 0,4,0 in -2,-13; contains blocks -32,0,-208 to -17,255,-193), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Level time: 6724 game time, 6724 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 44553 (now: false), thunder time: 95749 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: falseStacktrace: at net.minecraft.server.MinecraftServer.w(SourceFile:694) at rv.w(SourceFile:365) at net.minecraft.server.MinecraftServer.v(SourceFile:627) at net.minecraft.server.MinecraftServer.run(SourceFile:532) at java.lang.Thread.run(Unknown Source)
– System Details --Details: Minecraft Version: 18w21a Operating System: Linux (amd64) version 2.6.32-696.18.7.el6.x86_64 Java Version: 1.8.0_111, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 142113528 bytes (135 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB) JVM Flags: 5 total; -Xmx512M -Xms512M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxMetaspaceSize=128M Profiler Position: N/A (disabled) Player Count: 1 / 12; [sm['VirtualWandering'/384, l='Family Fun', x=-173.19, y=80.00, z=-161.87]] Data Packs: vanilla Is Modded: Unknown (can't tell) Type: Dedicated Server (map_server.txt)

Here are the console logs from the last crash
 
23.05 11:23:24 [Multicraft] Not restarting crashed server. 23.05 11:23:24 [Disconnect] User VirtualWandering has disconnected, reason: Server shutting down 23.05 11:23:24 [Multicraft] Server stopped 23.05 11:23:24 [Multicraft] Server shut down 23.05 11:23:23 [Server] Server Shutdown Thread/INFO Saving players 23.05 11:23:23 [Server] Server Shutdown Thread/INFO Stopping server 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/the_end 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/the_nether 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/overworld 23.05 11:23:22 [Server] Server thread/INFO Saving worlds 23.05 11:23:22 [Server] Server thread/INFO Saving players 23.05 11:23:22 [Server] Server thread/INFO Stopping server 23.05 11:23:22 [Server] Server thread/ERROR This crash report has been saved to: /./crash-reports/crash-2018-05-23_11.23.22-server.txt

I'm also having extreme memory issues when exploring in singleplayer (which makes sense cause there is an integrated server).

I haven't crashed, but the world has stopped rendering and all mobs and block interactions are frozen.  Memory is at about 98 % usage, then drops to 86 % from garbage collection most likely, rockets back up to 98% and repeats.

Edit: I cannot save and quit, it's no longer responding.

The second issue is MC-129136