When I try to run the example mod in Eclipse with Forge 1.7 the program automatically terminates without getting into the game. I am running Windows 10 with Eclipse, Java RTE 1.8, JDK 1.7. I successfully ran the gradlew workspace and eclipse command in cmd. Thank you in advance for any help you can give me.

 

Here is what the terminal says:

 

[19:25:21] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker [19:25:21] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker [19:25:21]

[main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker [19:25:22]

[main/INFO] [FML]: Forge Mod Loader version 7.2.211.1121 for Minecraft 1.7.2 loading [19:25:22]

[main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0_77, running on Windows 10:amd64:10.0, installed at C:\Program Files\Java\jre1.8.0_77 [19:25:22]

 

[main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation [19:25:22]

[main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [19:25:22] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker [19:25:22] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker [19:25:22] [main/ERROR] [LaunchWrapper]: Unable to launch java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_77] at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_77] at net.minecraft.launchwrapper.Launch.launch(Launch.java:117)

[launchwrapper-1.9.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[launchwrapper-1.9.jar:?] Java HotSpot 64-Bit Server VM

warning: Using incremental CMS is deprecated and will likely be removed in a future release

Just making sure, you are using minecraft 1.7.2 is that the version you want to make a mod for?

I run Minecraft 1.9 on my PC with Windows 7 and this system works. I thought I would be able to run this with Minecraft 1.9 on my laptop. Is there a conflict?

You can work with multiple versions of minecraft without a problem, I was just checking that you are using the right environment.

Can I install a different version of Minecraft for my modding environment than I have installed on my computer? I just installed the latest minecraft on my laptop and created the environment in accordance with instructions. I try to stick with Forge 1.7 because I have a book on using that instead of 1.8.

you found a book for 1.7.2??? You can have an environment for every version and a playable exe for every version if you want.

 

I would still recommend using 1.8.9 or 1.9 for your environment, for the most part the way the book tells you to do something will still work in the new versions, the biggest differences are in custom models and the syntax for registering (although that only changed a little bit).

Do I have to change the minecraft version on my runtime? I'm not sure how to do that. I stick with 1.7 because I couldn't figure out how to do textures on 1.8.