Server crash when a player logs in...

[EvilTelephone]

FTB Unleashed 1.1.7

Java 7u51

Sometimes, when a player logs in, the server crashes with the following error in the log:

2014-02-01 10:44:56 [SEVERE] java.lang.NoClassDefFoundError: net/minecraft/server/integrated/IntegratedServer
2014-02-01 10:44:56 [SEVERE]    at ic2.core.block.personal.TileEntityTradeOMat.permitsAccess(TileEntityTradeOMat.java:241)
2014-02-01 10:44:56 [SEVERE]    at ic2.core.block.personal.TileEntityTradeOMat.getGuiContainer(TileEntityTradeOMat.java:264)
2014-02-01 10:44:56 [SEVERE]    at ic2.core.Platform.launchGui(Platform.java:65)
2014-02-01 10:44:56 [SEVERE]    at ic2.core.block.BlockMultiID.func_71903_a(BlockMultiID.java:229)
2014-02-01 10:44:56 [SEVERE]    at ic2.core.block.personal.BlockPersonal.func_71903_a(BlockPersonal.java:136)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:585)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:875)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.network.packet.Packet15Place.func_73279_a(SourceFile:58)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:442)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:223)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:865)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:732)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:614)
2014-02-01 10:44:56 [SEVERE]    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
2014-02-01 10:44:56 [SEVERE] Caused by: java.lang.ClassNotFoundException: net.minecraft.server.integrated.IntegratedServer
2014-02-01 10:44:56 [SEVERE]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:273)
2014-02-01 10:44:56 [SEVERE]    at java.lang.ClassLoader.loadClass(Unknown Source)
2014-02-01 10:44:56 [SEVERE]    at java.lang.ClassLoader.loadClass(Unknown Source)
2014-02-01 10:44:56 [SEVERE]    ... 17 more
2014-02-01 10:44:56 [SEVERE] Caused by: java.lang.RuntimeException: Attempted to load class bjg for invalid side SERVER
2014-02-01 10:44:56 [SEVERE]    at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
2014-02-01 10:44:57 [SEVERE]    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:387)
2014-02-01 10:44:57 [SEVERE]    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:260)
2014-02-01 10:44:57 [SEVERE]    ... 19 more
2014-02-01 10:44:57 [SEVERE] Encountered an unexpected exception NoClassDefFoundError
java.lang.NoClassDefFoundError: net/minecraft/server/integrated/IntegratedServer
    at ic2.core.block.personal.TileEntityTradeOMat.permitsAccess(TileEntityTradeOMat.java:241)
    at ic2.core.block.personal.TileEntityTradeOMat.getGuiContainer(TileEntityTradeOMat.java:264)
    at ic2.core.Platform.launchGui(Platform.java:65)
    at ic2.core.block.BlockMultiID.func_71903_a(BlockMultiID.java:229)
    at ic2.core.block.personal.BlockPersonal.func_71903_a(BlockPersonal.java:136)
    at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:585)
    at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:875)
    at net.minecraft.network.packet.Packet15Place.func_73279_a(SourceFile:58)
    at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:442)
    at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:223)
    at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
    at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:865)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:732)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:614)
    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.integrated.IntegratedServer
    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:273)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 17 more
Caused by: java.lang.RuntimeException: Attempted to load class bjg for invalid side SERVER
    at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
    at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:387)
    at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:260)
    ... 19 more

Things I've tried so far:

- Update Java
- Delete all modpack files (on the server) and re-install from a fresh download

Any ideas of other things to try? Thanks.

 

[EvilTelephone]

Bump.

Please help if you can. It's happened 3 times today.

 

[Tristam Izumi]

Is there any consistency with who it happens for, or for people logging in to a certain area?

The log points toward it being somehow related to an IC2 tile entity, but I'm not learned enough to glean more from it.

 

[EvilTelephone]

I haven't seen a pattern yet. Today, for example, it was 3 different people, and they were all pretty far away from each other (1000+ meters).

100% of the time though, when it happens, it happens directly after a player joins. Usually within 1 second of the join.

 

[gadget500]

From what I have seen, it has something to do with when a trade-o-mat is used. I am having the same problem