#147 // is removed from JMX object names

[Jürgen Hermann]

If you define a graph on an object like this:

Catalina:j2eeType=Servlet,name=system-check,WebModule=//localhost/,
J2EEApplication=none,J2EEServer=none

(i.e. a Tomcat servlet), the double slash is reduced to a single one, effectively rendering the graph empty / unusable since the values cannot be fetched (object not found).