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Maven Mojos (and maybe components) can create / fork processes, common examples would include:
currently the IDE has no effective way to know about forked processes, so there is no way to visualize them (e.g. in a process manager) nor to take special actions on them (e.g. automatically request to open a debug port). For executions of tests, the IDE even may want to be notified about individual test runs while the process is running.
This now adds a new build-process API that mitigates the problem by allowing a mojo or component to make the IDE aware of subprocesses but is completely disabled if running outside an IDE. An integration can range from very basic, that is only notify that a process is running over to specialized callbacks that allows the IDE to intercept process creation in a generic way. An example implementation is provided for either resuse, extension or own implementation of such callbacks.
To reflect this new opportunity, the minor version is increase to 1.3 even though neither consumers nor providers of the API need to take immediate actions here.