Then you find that it consists of a number of fairly simple facilities that are often explained from a bottom-up detailed and technical viewpoint and not from a top-down architectural perspective.
If you are experiencing unusual behavior, this is the formal aspect you have to control.
And just in case you thought my example of video-processing was contrived, here is the built-in ImageOperation that allows you to draw colored ellipses and squares with Ant and then rotate and scale them.
To ensure that this is possible, you can designate a different classloader for the process.