The first thing I wanted to try to do with the new Barrier Block was to see if I could Enderpearl through them like you can with Bedrock to see if I can circumvent maps that used them, like the naughty little cheater I am. Guess Minecraft didn't take too kindly to my shenanigans and crashed! Here is the crash report:

WARNING! DON'T DO THIS ON A WORLD YOU LOVE, IT WILL EFFECTIVELY CORRUPT YOUR WORLD! EVERY TIME YOU ATTEMPT TO LOAD THE AFFECTED WORLD, MINECRAFT WILL CRASH!!

---- Minecraft Crash Report ----
// Oops.

Time: 1/30/14 8:08 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at bpv.a(SourceFile:540)
at bpv.b(SourceFile:514)
at bpq.b(SourceFile:680)
at bpq.a(SourceFile:1236)
at bpq.b(SourceFile:921)
at bcf.ag(SourceFile:803)
at bcf.f(SourceFile:730)
at net.minecraft.client.main.Main.main(SourceFile:154)

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

– Head –
Stacktrace:
at bpv.a(SourceFile:540)
at bpv.b(SourceFile:514)
at bpq.b(SourceFile:680)
at bpq.a(SourceFile:1236)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bpg['DJ91990'/367, l='MpServer', x=-254.01, y=85.65, z=-771.90]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: -222.00,64.00,-746.00 - World: (-222,64,-746), Chunk: (at 2,4,6 in -14,-47; contains blocks -224,0,-752 to -209,255,-737), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
Level time: 319039 game time, 1500 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 89 total; [yg['Creeper'/11247, l='MpServer', x=-288.50, y=15.00, z=-828.50], ys['Skeleton'/12397, l='MpServer', x=-295.50, y=18.00, z=-714.50], yx['Zombie'/10993, l='MpServer', x=-306.50, y=33.00, z=-716.50], yg['Creeper'/11262, l='MpServer', x=-227.50, y=32.00, z=-705.50], yg['Creeper'/11263, l='MpServer', x=-227.50, y=32.00, z=-704.50], ys['Skeleton'/11260, l='MpServer', x=-228.50, y=32.00, z=-703.50], ys['Skeleton'/11261, l='MpServer', x=-224.50, y=32.00, z=-707.50], wu['Sheep'/28, l='MpServer', x=-324.66, y=106.00, z=-827.44], ys['Skeleton'/11926, l='MpServer', x=-248.50, y=11.00, z=-810.50], wj['Bat'/11211, l='MpServer', x=-262.83, y=38.01, z=-702.44], ys['Skeleton'/11925, l='MpServer', x=-248.50, y=11.00, z=-807.50], wj['Bat'/11213, l='MpServer', x=-264.41, y=40.39, z=-689.65], ys['Skeleton'/4643, l='MpServer', x=-239.91, y=49.00, z=-848.50], yg['Creeper'/11934, l='MpServer', x=-224.50, y=27.00, z=-742.50], wu['Sheep'/42, l='MpServer', x=-310.66, y=83.00, z=-844.53], wu['Sheep'/43, l='MpServer', x=-312.53, y=115.00, z=-832.81], yh['Enderman'/8298, l='MpServer', x=-306.97, y=30.00, z=-727.63], wu['Sheep'/44, l='MpServer', x=-317.69, y=116.00, z=-824.66], wu['Sheep'/45, l='MpServer', x=-316.53, y=116.00, z=-825.53], ys['Skeleton'/9996, l='MpServer', x=-293.09, y=33.00, z=-712.44], yx['Zombie'/9997, l='MpServer', x=-278.50, y=35.00, z=-709.50], wu['Sheep'/48, l='MpServer', x=-312.47, y=79.00, z=-763.66], yx['Zombie'/9518, l='MpServer', x=-287.50, y=26.00, z=-733.50], xn['Boat'/52, l='MpServer', x=-312.50, y=63.29, z=-722.50], wl['Chicken'/69, l='MpServer', x=-296.44, y=78.00, z=-796.38], wu['Sheep'/71, l='MpServer', x=-297.66, y=84.00, z=-784.50], ys['Skeleton'/5914, l='MpServer', x=-205.50, y=19.00, z=-705.50], yx['Zombie'/11725, l='MpServer', x=-247.50, y=35.00, z=-803.50], wu['Sheep'/76, l='MpServer', x=-295.75, y=86.00, z=-763.19], yx['Zombie'/11724, l='MpServer', x=-241.50, y=35.00, z=-801.50], yx['Zombie'/11726, l='MpServer', x=-239.50, y=35.00, z=-799.50], wu['Sheep'/72, l='MpServer', x=-299.38, y=91.00, z=-776.53], wl['Chicken'/73, l='MpServer', x=-289.56, y=89.00, z=-777.41], wu['Sheep'/74, l='MpServer', x=-291.44, y=85.00, z=-781.59], wu['Sheep'/93, l='MpServer', x=-286.38, y=84.00, z=-789.69], wu['Sheep'/95, l='MpServer', x=-276.13, y=64.00, z=-738.84], wu['Sheep'/94, l='MpServer', x=-283.66, y=81.00, z=-754.53], wu['Sheep'/89, l='MpServer', x=-292.94, y=81.00, z=-786.59], wu['Sheep'/88, l='MpServer', x=-259.56, y=90.00, z=-802.19], wu['Sheep'/91, l='MpServer', x=-290.44, y=82.00, z=-791.75], wu['Sheep'/90, l='MpServer', x=-234.13, y=85.00, z=-780.50], bpg['DJ91990'/367, l='MpServer', x=-254.01, y=85.65, z=-771.90], wu['Sheep'/96, l='MpServer', x=-274.91, y=63.00, z=-720.88], wu['Sheep'/119, l='MpServer', x=-268.78, y=63.00, z=-720.56], wu['Sheep'/118, l='MpServer', x=-261.13, y=64.00, z=-730.16], wj['Bat'/10679, l='MpServer', x=-231.09, y=49.06, z=-842.64], wj['Bat'/11498, l='MpServer', x=-179.68, y=30.00, z=-749.40], yu['Spider'/8671, l='MpServer', x=-317.50, y=58.00, z=-779.50], wj['Bat'/10573, l='MpServer', x=-316.75, y=30.00, z=-768.25], wl['Chicken'/132, l='MpServer', x=-254.59, y=93.00, z=-808.56], xt['container.minecart'/134, l='MpServer', x=-248.50, y=31.50, z=-713.50], yx['Zombie'/9363, l='MpServer', x=-234.50, y=48.00, z=-843.50], yg['Creeper'/9364, l='MpServer', x=-231.50, y=48.00, z=-844.50], yg['Creeper'/9365, l='MpServer', x=-231.50, y=48.00, z=-845.50], yx['Zombie'/11267, l='MpServer', x=-191.50, y=30.00, z=-705.50], wu['Sheep'/145, l='MpServer', x=-228.81, y=93.00, z=-806.34], xz['entity.MinecartRideable.name'/146, l='MpServer', x=-234.50, y=82.50, z=-757.50], wu['Sheep'/149, l='MpServer', x=-224.66, y=63.00, z=-696.19], yx['Zombie'/9650, l='MpServer', x=-266.50, y=37.00, z=-817.16], yg['Creeper'/171, l='MpServer', x=-218.50, y=15.00, z=-710.50], wj['Bat'/12045, l='MpServer', x=-299.35, y=30.28, z=-744.19], ys['Skeleton'/9651, l='MpServer', x=-264.50, y=38.00, z=-819.50], wu['Sheep'/170, l='MpServer', x=-219.94, y=82.00, z=-727.94], wu['Sheep'/169, l='MpServer', x=-213.75, y=82.00, z=-725.63], wu['Sheep'/168, l='MpServer', x=-213.78, y=82.00, z=-729.91], wu['Sheep'/172, l='MpServer', x=-218.59, y=68.00, z=-709.09], wu['Sheep'/167, l='MpServer', x=-214.91, y=82.00, z=-729.91], wu['Sheep'/166, l='MpServer', x=-214.13, y=82.00, z=-728.78], wu['Sheep'/165, l='MpServer', x=-219.47, y=88.00, z=-796.66], wu['Sheep'/164, l='MpServer', x=-211.06, y=84.00, z=-814.91], wu['Sheep'/187, l='MpServer', x=-201.13, y=63.00, z=-706.06], wu['Sheep'/184, l='MpServer', x=-202.97, y=82.00, z=-805.97], zc['Villager'/185, l='MpServer', x=-206.69, y=81.00, z=-742.41], wu['Sheep'/188, l='MpServer', x=-197.91, y=63.00, z=-699.50], wu['Sheep'/183, l='MpServer', x=-202.50, y=80.21, z=-803.53], ys['Skeleton'/7226, l='MpServer', x=-324.50, y=23.00, z=-701.50], wu['Sheep'/205, l='MpServer', x=-185.72, y=63.00, z=-715.22], wu['Sheep'/204, l='MpServer', x=-177.47, y=92.00, z=-771.66], wu['Sheep'/200, l='MpServer', x=-187.88, y=79.00, z=-832.88], zc['Villager'/203, l='MpServer', x=-187.53, y=88.00, z=-776.00], wu['Sheep'/202, l='MpServer', x=-187.75, y=82.00, z=-804.66], yg['Creeper'/12129, l='MpServer', x=-217.50, y=31.00, z=-720.50], ys['Skeleton'/12154, l='MpServer', x=-192.50, y=26.00, z=-728.50], ys['Skeleton'/12153, l='MpServer', x=-188.44, y=25.00, z=-728.28], wu['Sheep'/216, l='MpServer', x=-175.50, y=105.00, z=-713.34], wj['Bat'/11603, l='MpServer', x=-280.56, y=53.00, z=-789.57], yg['Creeper'/8847, l='MpServer', x=-306.91, y=52.00, z=-760.34], wj['Bat'/10177, l='MpServer', x=-272.38, y=55.10, z=-741.25], ys['Skeleton'/8848, l='MpServer', x=-310.50, y=52.00, z=-764.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bne.a(SourceFile:298)
at bcf.b(SourceFile:2010)
at bcf.f(SourceFile:744)
at net.minecraft.client.main.Main.main(SourceFile:154)

– System Details –
Details:
Minecraft Version: 14w05a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 148809792 bytes (141 MB) / 411762688 bytes (392 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 102
Launched Version: 14w05a
LWJGL: 2.9.1
OpenGL: AMD Radeon(TM) HD 6620G GL version 4.1.11156 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 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: [paper_cutout__.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
Anisotropic Filtering: Off (1)