I finally managed to get my mod to successfully run in a server environment in Eclipse.

But when I then load the client and try to connect to the server this is the crash I get:

 

---- Minecraft Crash Report ----

// On the bright side, I bought you a teddy bear!

 

Time: 23/09/14 17:52

Description: Ticking screen

 

java.lang.NullPointerException: Ticking screen

at com.mojang.util.UUIDTypeAdapter.fromUUID(UUIDTypeAdapter.java:22)

at com.mojang.util.UUIDTypeAdapter.write(UUIDTypeAdapter.java:13)

at com.mojang.util.UUIDTypeAdapter.write(UUIDTypeAdapter.java:10)

at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:195)

at com.google.gson.Gson.toJson(Gson.java:593)

at com.google.gson.Gson.toJson(Gson.java:572)

at com.google.gson.Gson.toJson(Gson.java:527)

at com.google.gson.Gson.toJson(Gson.java:507)

at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54)

at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.joinServer(YggdrasilMinecraftSessionService.java:76)

at net.minecraft.client.network.NetHandlerLoginClient.handleEncryptionRequest(NetHandlerLoginClient.java:62)

at net.minecraft.network.login.server.S01PacketEncryptionRequest.processPacket(S01PacketEncryptionRequest.java:54)

at net.minecraft.network.login.server.S01PacketEncryptionRequest.processPacket(S01PacketEncryptionRequest.java:62)

at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:247)

at net.minecraft.client.multiplayer.GuiConnecting.updateScreen(GuiConnecting.java:116)

at net.minecraft.client.Minecraft.runTick(Minecraft.java:1751)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038)

at net.minecraft.client.Minecraft.run(Minecraft.java:961)

at net.minecraft.client.main.Main.main(Main.java:164)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at GradleStart.bounce(GradleStart.java:107)

at GradleStart.startClient(GradleStart.java:100)

at GradleStart.main(GradleStart.java:65)

 

 

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

---------------------------------------------------------------------------------------

 

-- Head --

Stacktrace:

at com.mojang.util.UUIDTypeAdapter.fromUUID(UUIDTypeAdapter.java:22)

at com.mojang.util.UUIDTypeAdapter.write(UUIDTypeAdapter.java:13)

at com.mojang.util.UUIDTypeAdapter.write(UUIDTypeAdapter.java:10)

at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:89)

at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:195)

at com.google.gson.Gson.toJson(Gson.java:593)

at com.google.gson.Gson.toJson(Gson.java:572)

at com.google.gson.Gson.toJson(Gson.java:527)

at com.google.gson.Gson.toJson(Gson.java:507)

at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54)

at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.joinServer(YggdrasilMinecraftSessionService.java:76)

at net.minecraft.client.network.NetHandlerLoginClient.handleEncryptionRequest(NetHandlerLoginClient.java:62)

at net.minecraft.network.login.server.S01PacketEncryptionRequest.processPacket(S01PacketEncryptionRequest.java:54)

at net.minecraft.network.login.server.S01PacketEncryptionRequest.processPacket(S01PacketEncryptionRequest.java:62)

at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:247)

at net.minecraft.client.multiplayer.GuiConnecting.updateScreen(GuiConnecting.java:116)

 

-- Affected screen --

Details:

Screen name: net.minecraft.client.multiplayer.GuiConnecting

Stacktrace:

at net.minecraft.client.Minecraft.runTick(Minecraft.java:1751)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038)

at net.minecraft.client.Minecraft.run(Minecraft.java:961)

at net.minecraft.client.main.Main.main(Main.java:164)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at GradleStart.bounce(GradleStart.java:107)

at GradleStart.startClient(GradleStart.java:100)

at GradleStart.main(GradleStart.java:65)

 

-- System Details --

Details:

Minecraft Version: 1.7.10

Operating System: Windows 8 (amd64) version 6.2

Java Version: 1.7.0_51, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 949007184 bytes (905 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)

JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

FML: MCP v9.05 FML v7.10.18.1180 Minecraft Forge 10.13.0.1180 4 mods loaded, 4 mods active

mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available

FML{7.10.18.1180} [Forge Mod Loader] (forgeSrc-1.7.10-10.13.0.1180.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available

Forge{10.13.0.1180} [Minecraft Forge] (forgeSrc-1.7.10-10.13.0.1180.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available

fandomcraft{1.7.10} [FandomCraft] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available

Launched Version: 1.7.10

LWJGL: 2.9.1

OpenGL: Intel® HD Graphics GL version 2.1.0 - Build 8.15.10.2858, 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: Definitely; Client brand changed to 'fml,forge'

Type: Client (map_client.txt)

Resource Packs: []

Current Language: English (US)

Profiler Position: N/A (disabled)

Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

Anisotropic Filtering: Off (1)

 

 

I'd really like NOT to have to compile my mod every time I want to test its compatibility with multiplayer.

I assume it's because Eclipse doesn't log into my account when loading Minecraft, so is there any way to do that without compiling the mod every time?

Set the server to offline mode in server.properties