how to pack my JAVA Application and automatically deploy it into the Octopus server from my Jenkins instance?
Using Maven to build it.
Hi,
Thanks for getting in touch! We have recently added further Java support in Octopus, this includes our new Java documentation page which should have all the information you need to get started here.
The above documentation is quite extensive and should cover the majority of your questions, however if you get stuck here please feel free to send through any questions.
Let me know how you go. 
Best regards,
Daniel