Hopper: java.lang.ExceptionInInitializerError

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-703916/

Crash:

java.lang.ExceptionInInitializerError
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:113)
	at bth.<init>(SourceFile:38)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Sorry :(

Time: 11/26/13 5:16 PM
Description: Starting integrated server

java.lang.ExceptionInInitializerError
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:113)
	at bth.<init>(SourceFile:38)
	at azh.a(SourceFile:1571)
	at bck.e(SourceFile:162)
	at bck.a(SourceFile:127)
	at bcj.a(SourceFile:172)
	at bcj.d(SourceFile:232)
	at bcj.k(SourceFile:211)
	at azh.o(SourceFile:1289)
	at azh.ag(SourceFile:741)
	at azh.e(SourceFile:692)
	at net.minecraft.client.main.Main.main(SourceFile:151)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
	at mv.<clinit>(SourceFile:31)
	... 12 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:57)
	... 16 more
Caused by: java.io.IOException: Unable to establish loopback connection
	at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.nio.ch.PipeImpl.<init>(Unknown Source)
	at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
	at java.nio.channels.Pipe.open(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
	at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
	... 19 more
Caused by: java.net.ConnectException: Connection refused: connect
	at sun.nio.ch.Net.connect(Native Method)
	at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
	at java.nio.channels.SocketChannel.open(Unknown Source)
	... 27 more


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

-- Head --
Stacktrace:
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:113)
	at bth.<init>(SourceFile:38)

-- Starting integrated server --
Details:
	Level ID: Copy of 172
	Level Name: Copy of 172
Stacktrace:
	at azh.a(SourceFile:1571)
	at bck.e(SourceFile:162)
	at bck.a(SourceFile:127)
	at bcj.a(SourceFile:172)
	at bcj.d(SourceFile:232)
	at bcj.k(SourceFile:211)

-- Affected screen --
Details:
	Screen name: bvc
Stacktrace:
	at azh.o(SourceFile:1289)
	at azh.ag(SourceFile:741)
	at azh.e(SourceFile:692)
	at net.minecraft.client.main.Main.main(SourceFile:151)

-- System Details --
Details:
	Minecraft Version: 13w48b
	Operating System: Windows NT (unknown) (amd64) version 6.2
	Java Version: 1.6.0_23, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 367346000 bytes (350 MB) / 405078016 bytes (386 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w48b
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2900, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-703916/32530121/