Are you sure you updated it? Including the links in the OP? Because I still get that error about javaw.
$ java -jar gudWrapper.jar SplatoonColorizer.gud
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: Loading...
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher loadPublicKey
INFO: Loading public key...
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: Checking for signature...
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: No signature
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: Loading application infromation...
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: Found needed libraries.
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher main
INFO: Verifing requirements...
Dec 25, 2015 5:37:55 PM com.gudenau.wrapper.Launcher verifyLibrary
INFO: Verifing GSON
Dec 25, 2015 5:37:56 PM com.gudenau.wrapper.Launcher main
INFO: Cleaning up...
Dec 25, 2015 5:37:56 PM com.gudenau.wrapper.Launcher main
INFO: Launching...
Dec 25, 2015 5:37:56 PM com.gudenau.wrapper.Launcher main
SEVERE: Error running application
java.io.IOException: Cannot run program "javaw": error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
at com.gudenau.wrapper.Launcher.main(Launcher.java:222)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
at java.lang.ProcessImpl.start(ProcessImpl.java:134)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
... 1 more