So I tried using forge-1.7.2-10.12.0.1047-src with the java coding program Eclipse, and got this error when I tried to run the program:

 

[11:44:07] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[11:44:07] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[11:44:07] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[11:44:07] [main/INFO]: Forge Mod Loader version 7.2.129.1047 for Minecraft 1.7.2 loading

[11:44:07] [main/INFO]: Java is Java HotSpot 64-Bit Server VM, version 1.7.0_51, running on Windows 8:amd64:6.2, installed at C:\Program Files\Java\jdk1.7.0_51\jre

[11:44:07] [main/INFO]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation

[11:44:07] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[11:44:07] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[11:44:07] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[11:44:07] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[11:44:07] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[11:44:07] [main/ERROR]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!

[11:44:08] [main/ERROR]: The minecraft jar file:/C:/Users/Jon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.1047/forgeBin-1.7.2-10.12.0.1047.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!

[11:44:08] [main/ERROR]: FML has been ordered to ignore the invalid or missing minecraft certificate. This is very likely to cause a problem!

[11:44:08] [main/ERROR]: Technical information: ClientBrandRetriever was at jar:file:/C:/Users/Jon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.1047/forgeBin-1.7.2-10.12.0.1047.jar!/net/minecraft/client/ClientBrandRetriever.class, there were 0 certificates for it

[11:44:08] [main/ERROR]: FML appears to be missing any signature data. This is not a good thing

[11:44:08] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[11:44:08] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker

[11:44:09] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}

[11:44:12] [main/ERROR]: Unable to launch

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_51]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_51]

at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_51]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

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

Caused by: joptsimple.MissingRequiredOptionException: Missing required option(s) ['accessToken']

at joptsimple.OptionParser.ensureRequiredOptions(OptionParser.java:447) ~[OptionParser.class:?]

at joptsimple.OptionParser.parse(OptionParser.java:437) ~[OptionParser.class:?]

at net.minecraft.client.main.Main.main(Main.java:44) ~[Main.class:?]

... 6 more

 

Can anyone help me out here?

Did you do the 'gradlew eclipse' after doing 'gradlew setupDecompWorkspace'?

ah, I did "setupDevWorkspace", not "setupDecompWorkspace", I'll try that now

 

Okay, so did that, but am now getting a new error:

 

[13:40:59] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[13:40:59] [main/INFO] [FML]: Forge Mod Loader version 7.2.129.1047 for Minecraft 1.7.2 loading

[13:40:59] [main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.8.0, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre8

[13:40:59] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation

[13:40:59] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[13:40:59] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[13:40:59] [main/ERROR] [FML]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!

[13:41:00] [main/ERROR] [FML]: The minecraft jar file:/C:/Users/Jon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.1047/forgeSrc-1.7.2-10.12.0.1047.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!

[13:41:00] [main/ERROR] [FML]: FML has been ordered to ignore the invalid or missing minecraft certificate. This is very likely to cause a problem!

[13:41:00] [main/ERROR] [FML]: Technical information: ClientBrandRetriever was at jar:file:/C:/Users/Jon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.1047/forgeSrc-1.7.2-10.12.0.1047.jar!/net/minecraft/client/ClientBrandRetriever.class, there were 0 certificates for it

[13:41:00] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

[13:41:00] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[13:41:00] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker

[13:41:01] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}

[13:41:01] [main/ERROR] [LaunchWrapper]: Unable to launch

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

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

Caused by: java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path

at java.lang.ClassLoader.loadLibrary(Unknown Source) ~[?:1.8.0]

at java.lang.Runtime.loadLibrary0(Unknown Source) ~[?:1.8.0]

at java.lang.System.loadLibrary(Unknown Source) ~[?:1.8.0]

at org.lwjgl.Sys$1.run(Sys.java:73) ~[lwjgl-2.9.0.jar:?]

at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0]

at org.lwjgl.Sys.doLoadLibrary(Sys.java:66) ~[lwjgl-2.9.0.jar:?]

at org.lwjgl.Sys.loadLibrary(Sys.java:95) ~[lwjgl-2.9.0.jar:?]

at org.lwjgl.Sys.<clinit>(Sys.java:112) ~[lwjgl-2.9.0.jar:?]

at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:2727) ~[Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:40) ~[Main.class:?]

... 6 more

 

What am I doing wrong here?

Did you run 'gradlew eclipse'?

Yes, I did that after running "gradlew setupDecompWorkspace", it gave me that after I ran both commands and then ran it from eclipse.

Your crash log says it can't find lwjgl in java.library.path, so i think there must be something wrong. But i don't know what went wrong.

I just had to move my eclipse workspace to the folder with the forge stuff, derp...