The directory scan sample uses ObjectNames like com.sun.jmx.examples.scandir:type=DirectoryScannerMXBean,name=scan-build
The "MXBean" is superfluous and doesn't correspond with standard ObjectNames in the JMX API itself, such as JMImplementation:type=MBeanServerDelegate (not type=MBeanServerDelegateMBean). It is likely to influence people to follow this bad example.