So here's what I am trying to do. I have two separate web applications on one machine. I have a registry setting which I change in Application A, which will need to be picked up by Application B. I would like to set up a listener to monitor the Registry and pick up any changes. From what I can tell the C++ equivalent would be RegNotifyChangesKeyValue. Can someone point me toward the appropriate library or documentation to accomplish this? Is it even possible? Or am I going to have to right a plugin?
The registry is a very Windows-specific thing. Java is a platform-independent language, meant to work on many different operating systems. Therefore it does not contain classes and methods in the standard Java API for functionality that is very specific to a particular operating system.
There are libraries that you can get to work with the Windows registry from Java; Google for example for "java windows registry" to find them. I don't know if there's one that will support the functionality that you need, you'll have to check that out.