I'm not sure I understand what you are looking for here. There are three broad things it might be from what you've said:
For the third one, you don't need to use Java, you can write in any language you want, as long as it can issue REST calls. There is an example chunk of code called the JRJC, but I generally don't bother with it because we get a lot of questions here about it where the answer comes down to "it will be far more simple if you did this yourself with a direct REST call instead of trying to wedge it through the JRJC"
Can you believe there's less than one month until Summit 2019? It's time to start planning your agendas, not to mention packing ... In the meantime, introduce yourselves on this thread so that you ...
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