There is no Java error when loading mods put there is a probleme anyway.
I made a custom launcher for minecraft which allow to launch minecraft from %appdata%/.XoCraft (/bin)
Minecraft is working good but forge load the mod from %appdata%/.minecraft/mods
I include some lines of the ForgeModLoader-client-0.log
Forge libs, Forge Configuration files, Forge log are all in %appdata%/.minecraft/ it's automatic
I tryed with thos forge version: 7.8.0.684 / 7.8.0.733 / 7.8.1.737
2013-06-25 17:51:47 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.2.23.737 for Minecraft 1.5.2 loading
2013-06-25 17:51:47 [iNFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.7.0_25, running on Windows 7:amd64:6.1, installed at d:\Program Files\Java\jre7
2013-06-25 17:51:47 [FINE] [ForgeModLoader] Java classpath at launch is d:\Users\Thomas\Dropbox\Public\Launcher\Launcher_XoCraft.exe
2013-06-25 17:51:47 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] All core mods are successfully located
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Discovering coremods
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.8.6.12.jar
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.8.6.12.jar
2013-06-25 17:51:47 [WARNING] [ForgeModLoader] The coremod codechicken.core.asm.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Loaded coremod CodeChickenCore 0.8.6.12.jar
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found a candidate coremod NotEnoughItems 1.5.2.22.jar
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Loading coremod NotEnoughItems 1.5.2.22.jar
2013-06-25 17:51:47 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Loaded coremod NotEnoughItems 1.5.2.22.jar
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file argo-small-3.2.jar present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file guava-14.0-rc3.jar present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file asm-all-4.1.jar present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file bcprov-jdk15on-148.jar present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file deobfuscation_data_1.5.2.zip present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Found library file scala-library.jar present and correct in lib dir
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Running coremod plugins
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Running coremod plugin FMLCorePlugin
2013-06-25 17:51:47 [sEVERE] [ForgeModLoader] FML appears to be missing any signature data. This is not a good thing
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Coremod plugin FMLCorePlugin run successfully
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Running coremod plugin FMLForgePlugin
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Coremod plugin FMLForgePlugin run successfully
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Running coremod plugin CodeChickenCorePlugin
2013-06-25 17:51:47 [iNFO] [sTDOUT] Adding Accesstransformer map: codechickencore_at.cfg
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Coremod plugin CodeChickenCorePlugin run successfully
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Running coremod plugin NEICorePlugin
2013-06-25 17:51:47 [iNFO] [sTDOUT] Adding Accesstransformer map: nei_at.cfg
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Coremod plugin NEICorePlugin run successfully
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Validating minecraft
2013-06-25 17:51:47 [FINEST] [ForgeModLoader] Minecraft validated, launching...
2013-06-25 17:51:48 [iNFO] [sTDOUT] Inserted super call into azg.c
2013-06-25 17:51:48 [iNFO] [sTDOUT] ayl was overriden from NotEnoughItems 1.5.2.22.jar
2013-06-25 17:51:49 [iNFO] [sTDOUT] Generated BlockMobSpawner helper method.
2013-06-25 17:51:49 [iNFO] [sTDOUT] 229 recipes
2013-06-25 17:51:49 [iNFO] [sTDOUT] 27 achievements
2013-06-25 17:51:50 [iNFO] [Minecraft-Client] Setting user: 50thomatoes50
2013-06-25 17:51:50 [iNFO] [sTDOUT] (Session ID is ##################)
2013-06-25 17:51:50 [iNFO] [Minecraft-Client] LWJGL Version: 2.4.2
2013-06-25 17:51:50 [iNFO] [MinecraftForge] Attempting early MinecraftForge initialization
2013-06-25 17:51:50 [iNFO] [sTDOUT] MinecraftForge v7.8.1.737 Initialized
2013-06-25 17:51:50 [iNFO] [ForgeModLoader] MinecraftForge v7.8.1.737 Initialized
2013-06-25 17:51:50 [iNFO] [sTDOUT] Replaced 85 ore recipies
2013-06-25 17:51:50 [iNFO] [MinecraftForge] Completed early MinecraftForge initialization
2013-06-25 17:51:50 [iNFO] [ForgeModLoader] Reading custom logging properties from D:\Users\Thomas\AppData\Roaming\.minecraft\config\logging.properties
2013-06-25 17:51:50 [OFF] [ForgeModLoader] Logging level for ForgeModLoader logging is set to ALL
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Building injected Mod Containers [cpw.mods.fml.common.FMLDummyContainer, net.minecraftforge.common.ForgeDummyContainer, codechicken.core.asm.CodeChickenCoreModContainer, codechicken.nei.asm.NEIModContainer]
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Attempting to load mods contained in the minecraft jar file and associated classes
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file d:\Users\Thomas\AppData\Roaming\.XoCraft\bin\lwjgl.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file d:\Users\Thomas\AppData\Roaming\.XoCraft\bin\jinput.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file d:\Users\Thomas\AppData\Roaming\.XoCraft\bin\lwjgl_util.jar
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Found a minecraft related file at d:\Users\Thomas\AppData\Roaming\.XoCraft\bin\xocraft.jar, examining for mod candidates
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Found a minecraft related file at D:\Users\Thomas\AppData\Roaming\.minecraft\coremods\CodeChickenCore 0.8.6.12.jar, examining for mod candidates
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Found a minecraft related file at D:\Users\Thomas\AppData\Roaming\.minecraft\coremods\NotEnoughItems 1.5.2.22.jar, examining for mod candidates
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\argo-small-3.2.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\guava-14.0-rc3.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\asm-all-4.1.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\bcprov-jdk15on-148.jar
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\deobfuscation_data_1.5.2.zip
2013-06-25 17:51:50 [FINER] [ForgeModLoader] Skipping known library file D:\Users\Thomas\AppData\Roaming\.minecraft\lib\scala-library.jar
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Minecraft jar mods loaded successfully
2013-06-25 17:51:50 [iNFO] [ForgeModLoader] Searching D:\Users\Thomas\AppData\Roaming\.minecraft\mods for mods
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Found a candidate zip or jar file [1.5.2]ReiMinimap_v3.3_06.zip
2013-06-25 17:51:50 [FINE] [ForgeModLoader] Found a candidate zip or jar file buildcraft-A-3.7.1.jar
