In JES5 (yet to be released) and IFR release to JES4 , you can access these utilities from the org.netbeans.lib.collab.tools package.
I am not sure if these utilities are documented or meant for general user - they are used internally as part of our load testing framework.
Since the source code is opensource (as part of netbeans), you can ofcourse take a look at it and figure out how to use it.
Please note that while we could try to help in their use , you will need to do most of the work of figuring it out yourself - they are not really part of the exposed interface and are what gets used internally.
Regards,
Mridul