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[HOWTO] "./gradlew setupDecompWorkspace eclipse" Mac OSX


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My son and I have been working our way through the book, "Minecraft Modding with Forge", only to get stuck on page six for quite a while.  We found lots of people encountering the same error, but no solutions.  Tonight, I was determined to get it to work, and here is how I did it!


The first step can be done with your regular user account:


1. Download Minecraft Forge from http://files.minecraftforge.net (get the "recommended version"--at the time of this post, (the Mdk one)).


2. You should now have a 'Forge' directory in your 'Downloads' folder (mine was actually named 'Forge-1').  Make a folder on your Desktop called 'forge' and copy the contents of the Download 'Forge' directory into the 'forge' directory on your Desktop.


Note: These next few steps need to be run under an Administrator account:


3. Install "brew" from http://brew.sh, which you can use to easily install an older version of Java SDK (1.6)


4. Install Java SDK 1.6 by typing the following into the 'Terminal' program:


brew tap cask room/versions

brew cask install java6


5. Delete the 'vecmath.jar' file in /System/Library/Java/Extensions (if you don't have a copy of 'vecmath.jar' at this location, that is ok)


Now go back to your regular user account


6. Set your JAVA_HOME environment variable, again using the "Terminal" program:


export JAVA_HOME=$(/usr/libexec/java_home -v 1.6)


7. Change directories to your Desktop 'forge' directory


8. Edit the 'gradlew' file.  Change the DEFAULT_JVM_OPTS="" line to DEFAULT_JVM_OPTS="-Xmx1024m"


9. You're now ready to run the command:


./gradlew setupDecompWorkspace eclipse


I got the desired "BUILD SUCCESSFUL" message after about 5 minutes and 30 seconds.  If you get past the 'recompileMc' task, you should be home free.


I really hope this helps others who are working with the book, or trying to get Forge to work on OSX.  It can be done!  Don't give up!


[My System Specs]


OS X Yosemite (version 10.10.5)

Mac mini (Late 2009)

Processor 2.66 GHz Intel Core 2 Duo

Memory 8GB 1067 Mhz DDR3

Graphics NVIDIA GeForce 9400 256MB

Using Java SDK 1.6 co-installed with Java SDK 1.8

JAVA_HOME set using /usr/libexec/java_home -v 1.6


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