FriendofCreepers

terrific stuff works perfectly. Many thanks

It's a problem I have had for a long while now, but I can't figure out how to make it go away. Clean install of Minecraft, removed ALL Java, JDK etc. and even reset the environment variale so there was no trace of Java anywhere. Re-installed Java ( 1.7.0_71 ) and ran Minecraft once. works fine. Set up a 1.7.10 profile....ran that once ...works fine Installed Forge for 1.7.10 recommended version ( 1230 ) and fired up Minecraft. Game loads fine, but crashes as soon as I load or create a map. Including a map that ran fine before Forge was installed. No mods other than Forge. Here's the full error report: ---- Minecraft Crash Report ---- // Everything's going to plan. No, really, that was supposed to happen. Time: 01/01/15 12:42 Description: Starting integrated server java.lang.ExceptionInInitializerError at net.minecraft.server.MinecraftServer.<init>(MinecraftServer.java:146) at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:45) at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2080) at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:669) at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:183) at net.minecraft.client.gui.GuiSelectWorld.func_146284_a(GuiSelectWorld.java:130) at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225) at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296) at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) at net.minecraft.client.main.Main.main(SourceFile:148) 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:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) 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 net.minecraft.network.NetworkSystem.<clinit>(NetworkSystem.java:47) ... 19 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) ... 23 more Caused by: java.io.IOException: Unable to establish loopback connection at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) at sun.nio.ch.PipeImpl$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) ... 26 more Caused by: java.net.SocketException: Permission denied: listen at sun.nio.ch.Net.listen(Native Method) at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source) at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source) at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source) ... 35 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>(MinecraftServer.java:146) at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:45) -- Starting integrated server -- Details: Level ID: 1_710 world Level Name: 1.710 world Stacktrace: at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2080) at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:669) at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:183) at net.minecraft.client.gui.GuiSelectWorld.func_146284_a(GuiSelectWorld.java:130) at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225) at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296) at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268) -- Affected screen -- Details: Screen name: net.minecraft.client.gui.GuiMainMenu Stacktrace: at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) at net.minecraft.client.main.Main.main(SourceFile:148) 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:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) -- System Details -- Details: Minecraft Version: 1.7.10 Operating System: Windows 7 (amd64) version 6.1 Java Version: 1.7.0_71, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 159790664 bytes (152 MB) / 255037440 bytes (243 MB) up to 1060372480 bytes (1011 MB) JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M 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 v7.10.85.1230 Minecraft Forge 10.13.2.1230 3 mods loaded, 3 mods active mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available FML{7.10.85.1230} [Forge Mod Loader] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available Forge{10.13.2.1230} [Minecraft Forge] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available Launched Version: 1.7.10-Forge10.13.2.1230 LWJGL: 2.9.1 OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation 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: 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) Now...I have asked about this before, and was given a workaround, adding -Djava.net.preferIPv4Stack=true to the launcher JVM arguments, and this does work fine. The issue I have now is that I want to start modding myself. I have been working my way hrough various Java courses etc. to get a good grounding on what is what, but I cannot get Minecraft with Forge to run under Eclipse to test my code. I don't know how to apply the workaround to Eclipse.... but would actually much prefer sorting the problem itself! Annoyingly...both my kids PCs do not have this problem. One runs XP, one runs Win7 the same as mine. Mine screws up....there's do not! Even with a fresh install. Is there a specific version of Java I need to run for Forge to avoid issues?

Tried it with Firewall on and off ... but it wouldn't work, even when I set it to 'allow all'. I suspect I would have to disable it entirely, which I am reluctant to do as it is also my antivirus. It's the free version of Outpost Security Suite 7.1 for reference. I may have to find myself a different firewall altogether. Odd that it lets me run vanilla both SP and LAN/online.... Added the statement you suggested to the JVM arguments in the loader however, and it works! "-Djava.net.preferIPv4Stack=true" and the game is running with forge enabled. I have added in a couple of Forge compatable mods to test, and it's all running perfectly. I won't pretend to know exactly what the statement does, but it works. Many thanks LexManos!

Initially, I got horribly stuck with the installer failing to load the library files, but I found my fire-wall was blocking them, so sorted that and got the installer working fine. I installed Forge on a brand new 1.7.10 install, which had been run once to check all was well and a map briefly created. I then installed Forge, and ran the game again through the installer, choosing a new profile which picked up Forge correctly. The game starts up just fine, and I get the front screen indicating 3 mods in place. MCP 9.05, FML 7.10.18.1180 and Forge 10.13.0.1180. Nothing else. The MODS folder is empty. I have tried running with the firewall on and off. I have tried creating or opening a map, and creating a map in vanilla 1.7.10 still crashes when opening in Forge. I have searched for similar issues, but in all cases the root cause seemed to be a mod issue.... but I have no mods in place. I have double checked this by deleting the whole install and reloading the game files.