$ bin/jvm-mon
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvmstat/monitor/MonitorException
	at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:157)
	at JvmMon.update(JvmMon.java:38)
	at JvmMon.main(JvmMon.java:22)
Caused by: java.lang.ClassNotFoundException: sun.jvmstat.monitor.MonitorException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 3 more

$ java -version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

$ uname -a
Darwin somehost.local 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan  9 23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64