jinfo tool prints Java System properties and JVM command line flags for a live process or for a core dump. Please add -flag option to view and turn on/off a JVM flag dynamically. This is applicable only for live processes and only for a select subset of "manageable" flags. Not all JVM command line flags can be safely set dynamically. So, allow only a few flags such as PrinGC, PrintGCDetails, TraceClassLoading (or verbose:class) etc. to be turned on/off dynamically.