How does Oracle JDK licensing works for freelancers?

[autumn blade]

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[queen estuary]

I'm gonna start a new project and I don't know how it works...does the client pay for the licence and I develop with sort of an account key and install the paid version on my pc or is the paid licnese only necessary in production. I also wonder if it would be appropriate to develop the whole system using open jdk for a nation wide company that wants the project to be very secure.

It's gonna be Microservices and 2 backends in total.

[hearty kite]

Honestly, I'm buried under the customers who explain that they don't give a shyt about security and that it really doesn't matter if my grandma can hack into their system.

Almost everyone uses openjdk.
Everyone wants excellent security measures.
I'm not even sure the Oracle JDK adds to security questions without having to choose to enable stuff.