Server set up issues

[Mr Salt]

I have looked everywhere and can't find an answer to my problem if anyone could please help or point me in the right direction I would highly appreciate it. Here is the message.

 

C:\Users\user\Desktop\Tekkit>java -Xmx3G -Xms2G -jar Tekkit.jar
May 06, 2015 7:24:42 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker
May 06, 2015 7:24:42 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLServerTweak
er
May 06, 2015 7:24:42 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLServerTweaker
2015-05-06 19:24:42 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965
for Minecraft 1.6.4 loading
2015-05-06 19:24:42 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Serv
er VM, version 1.8.0_45, running on Windows 7:amd64:6.1, installed at C:\Program
 Files\Java\jre1.8.0_45
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod appeng.transformer.Ap
pEngCore does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2015-05-06 19:24:42 [INFO] [ForgeModLoader] [AppEng] Core Init
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod calclavia.lib.Calclav
iaPluginLoader does not have a MCVersion annotation, it may cause issues with th
is version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issu
es with this version of Minecraft
2015-05-06 19:24:42 [INFO] [STDERR] Warning: version of ForgeMultipart-universal
-1.6.4-, 1.0.0.250 is newer than request 1.0.0.244
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugi
n does not have a MCVersion annotation, it may cause issues with this version of
 Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod mods.immibis.microblo
cks.coremod.MicroblocksCoreMod does not have a MCVersion annotation, it may caus
e issues with this version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.F
MLPlugin does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod logisticspipes.asm.Lo
gisticsPipesCoreLoader does not have a MCVersion annotation, it may cause issues
 with this version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod micdoodle8.mods.micco
re.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues wit
h this version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.N
EICorePlugin does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCore
Plugin does not have a MCVersion annotation, it may cause issues with this versi
on of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod mrtjp.projectred.comp
atibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may c
ause issues with this version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod universalelectricity.
core.UELoader does not have a MCVersion annotation, it may cause issues with thi
s version of Minecraft
2015-05-06 19:24:42 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2015-05-06 19:24:42 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLInjectionAndSortingTweaker
2015-05-06 19:24:42 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLDeobfTweaker
2015-05-06 19:24:42 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.com
mon.launcher.FMLInjectionAndSortingTweaker
2015-05-06 19:24:42 [SEVERE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
        at java.util.ArrayList$Itr.remove(Unknown Source)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
        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 cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j
ava:48)
        at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.
java:17)

C:\Users\user\Desktop\Tekkit>pause
Press any key to continue . . .

[Mr Salt]

Used legacy java fixer jar. Seen it recommended a lot. Might as well include this jar in server files as it fixes so many problems.

 

[plowmanplow]

You found a correct solution. The other would be to use the updated Forge build (1345) on the server which includes that fix. However, for the sake of future folks finding this thread it does not fix many problems, it simply addresses this one specific issue of certain Forge versions not liking Java 8. That's all.