may relate to MC-90062
of the server being to resource hungry.
but this is weird it says
at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.get(Long2ObjectOpenHashMap.java:379)
i have never seen such an output from a server, maybe its a snapshot thing but it happened after i wrote /locate endcity in the overworld, i meant to type
/locate enddungeon
so i think that the issue
i havent been able to find a duplicate on this yet
EDIT: adding more ram solve the /locate command issue but its still crashing. see Crash log 3.txt
Quoting Icswolf
May be different JVM Flags on your computer then it will work.
See here:
http://www.minecraftforum.net/forums/support/server-support/2749267-server-lag-and-crashes