Server crashes with long error message

I'm getting this error and the server crashes:
2013-04-09 14:00:21 [SEVERE] ------------------------------
2013-04-09 14:00:21 [SEVERE] Current Thread: Command Reader Thread
2013-04-09 14:00:21 [SEVERE] PID: 14 | Suspended: false | Native: true | State: RUNNABLE
2013-04-09 14:00:21 [SEVERE] Thread is waiting on monitor(s):
2013-04-09 14:00:21 [SEVERE] Locked on:java.io.BufferedInputStream.read(Unknown Source)
2013-04-09 14:00:21 [SEVERE] Locked onrg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:267)
2013-04-09 14:00:21 [SEVERE] Locked onrg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:204)
2013-04-09 14:00:21 [SEVERE] Stack:
2013-04-09 14:00:21 [SEVERE] java.io.FileInputStream.readBytes(Native Method)
2013-04-09 14:00:21 [SEVERE] java.io.FileInputStream.read(Unknown Source)
2013-04-09 14:00:21 [SEVERE] java.io.BufferedInputStream.fill(Unknown Source)
2013-04-09 14:00:21 [SEVERE] java.io.BufferedInputStream.read(Unknown Source)
2013-04-09 14:00:21 [SEVERE] java.io.FilterInputStream.read(Unknown Source)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader$1.read(ConsoleReader.java:167)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:267)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:204)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:995)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLineSimple(ConsoleReader.java:1506)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:1153)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:1117)
2013-04-09 14:00:21 [SEVERE] org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:1105)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.ThreadCommandReader.run(ThreadCommandReader.java:34)
2013-04-09 14:00:21 [SEVERE] ------------------------------
2013-04-09 14:00:21 [SEVERE] Current Thread: DestroyJavaVM
2013-04-09 14:00:21 [SEVERE] PID: 13 | Suspended: false | Native: false | State: RUNNABLE
2013-04-09 14:00:21 [SEVERE] Stack:
2013-04-09 14:00:21 [SEVERE] ------------------------------
2013-04-09 14:00:21 [SEVERE] Current Thread: Server thread
2013-04-09 14:00:21 [SEVERE] PID: 11 | Suspended: false | Native: false | State: RUNNABLE
2013-04-09 14:00:21 [SEVERE] Stack:
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.Block.b(Block.java:314)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.Block.a(Block.java:306)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.World.getCubes(World.java:1087)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.Entity.move(Entity.java:522)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.EntityTNTPrimed.l_(EntityTNTPrimed.java:50)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.World.entityJoinedWorld(World.java:1457)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.WorldServer.entityJoinedWorld(WorldServer.java:629)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.World.playerJoinedWorld(World.java:1433)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1305)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.WorldServer.tickEntities(WorldServer.java:495)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:559)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:229)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:469)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:401)
2013-04-09 14:00:21 [SEVERE] net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
2013-04-09 14:00:21 [SEVERE] ------------------------------
2013-04-09 14:00:21 [SEVERE] Current Thread: Signal Dispatcher
2013-04-09 14:00:21 [SEVERE] PID: 4 | Suspended: false | Native: false | State: RUNNABLE
2013-04-09 14:00:21 [SEVERE] Stack:
2013-04-09 14:00:21 [SEVERE] ------------------------------
Help.