How to hide the internal structure of a Java API to the rest of the world

Question

i am developing a Java Api to do things (secret, uhhhh ;).

Is there a way to hide classes, and the internal structure of my API?

What i found until now:

Answer 1

• You can try and make only your interfaces public. Have a look at the Factory Pattern.
• Alternatively, you can implement you're application in OSGI.

Neither of these methods would allow you to hide the implementation completely to someone who really wanted to see it. Someone could still use a decompiler to examine you .class files, or even examine the code in memory.

If you really need to protect your implementation in this way, then a good approach would be to only allow access to your application as a remote service and host it on a secure machine.