$ opt/jvm-mon-0.1/bin/jvm-mon
objc[39393]: Class JavaLaunchHelper is implemented in both /Users/dnw/.jenv/versions/1.8/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.

node.js:376
        callback();
        ^
module.js:341: Error: Cannot find module '/Users/dnw/opt/jvm-mon-0.1/bin/src/dist/jvm-mon.js'

$ cd opt/jvm-mon-0.1
$ bin/jvm-mon
objc[39418]: Class JavaLaunchHelper is implemented in both /Users/dnw/.jenv/versions/1.8/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.~
$ # that worked