I created a server and had my brother and a friend join back in 15w38a and after all 3 joined the server shut down. Today when I saw the new snapshot I decided to check the server and it crashed when me and my brother joined.
PLEASE HELP! I don't know if this is the server or if its my computer.
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Im having the same issue.

ok i will try

Here it is
Minecraft Crash Report ----
// Shall we play a game?
Time: 9/17/15 5:13 PM
Description: Exception in server tick loop
java.lang.OutOfMemoryError: Java heap space
at io.netty.buffer.UnpooledHeapByteBuf.<init>(UnpooledHeapByteBuf.java:45)
at io.netty.buffer.UnpooledByteBufAllocator.newHeapBuffer(UnpooledByteBufAllocator.java:43)
at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:136)
at io.netty.buffer.Unpooled.buffer(Unpooled.java:137)
at gp.a(SourceFile:36)
at gp.<init>(SourceFile:29)
at lp.c(SourceFile:127)
at lp.a(SourceFile:60)
at lq.a(SourceFile:219)
at mg.a(SourceFile:253)
at mg.c(SourceFile:310)
at mg.a(SourceFile:160)
at lx.b(SourceFile:116)
at lx.c(SourceFile:62)
at ek.a(SourceFile:229)
at lu.c(SourceFile:177)
at net.minecraft.server.MinecraftServer.D(SourceFile:636)
at kv.D(SourceFile:314)
at net.minecraft.server.MinecraftServer.C(SourceFile:546)
at net.minecraft.server.MinecraftServer.run(SourceFile:450)
at java.lang.Thread.run(Unknown Source)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
– System Details –
Details:
Minecraft Version: 15w38b
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 574016 bytes (0 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
JVM Flags: 0 total;
IntCache: cache: 2, tcache: 0, allocated: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 2 / 20; [lm['superbatboy101'/254, l='world', x=-343.84, y=84.02, z=173.95], lm['goodwolf101'/296, l='world', x=-366.64, y=80.37, z=167.79]]
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)

If your going to fix it cant you update the server by the 20th? Its my Birthday and im going to be playing video games with my friends on my servers and I REALLY need this fixed.

Duplicate of MC-12949. According to your report you've only allocated about 256MB of memory to your server, and it's quickly running out. I'd recommend you allocate more to accommodate more players.
For technical support please use the Mojang Support Center.

I solved the problem by disabling nether portals.
Please attach the server logs and/or crash report.