This has been scratching my head, I've started from scratch about 5 times now with slightly different set up each time, but every time it gets to mergeJars it fails and doesn't tell me much more. Looking at other people's logs it seems like it's actually supposed to skip, but no idea how to make it do that.
log file: https://gist.github.com/anonymous/d93ae9c91b616ca2ef3c
Setup:
Windows 7 home 64x
Jdk and Java both: 7 update 55
Path set to C:\Program Files\Java\jdk1.7.0_55\bin
JAVA_HOME set to C:\Program Files\Java\jdk1.7.0_55
Forge version: forge-1.7.2-10.12.1.1084-src (Latest as of 5/20/14)
Directory I extracted zip to: C:\development\forge
Reproduce error:
extract forge to directory
shift+right click > run command window
type gradlew.bat setupDecompWorkspace
Log file above is produced(It's run before, which is why it only took 28 seconds as opposed to 10 minutes) but always stuck on that.
EDIT: Either redownloading eclipse or redownloading forge fixed it. I dunno. Follow Wuppy's tut from scratch if you have this problem.