Here is a sample project where I used one of the features provided CDP:
What feature of DevTools do you want to use? The DevTools offers a lot of utilities each of which deserves own API. So you should forcus on one at a time.
Here is a set of sample Java codes that utilizes features offered by Chrome DevTools Protocol.
Do you find something you want to try yourself? If yes, that’s the one you should look at deep. If no, … mmm, you have invent a magic for yourself. Good luck.