access modifiers - How can classes be made to be accessible from different package but not accessible from different library/ jar in java? -

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I want my library / jar in Java so that only its behavior (exposed interface) can be made public and the other - I want to use different packages to be able to moderate the public code for the outside world.

How can I make classes accessible to each other from different packages within a single jar, but can not reach any customer outside the jar?

You can not do this easily in normal Java, though OSGI makes it possible. Generally, to create a separate API library with the interface and its "private" classes are a better way to implement those interfaces. Then the client code can use the interface to interact with your library, but there is no need to know about the details.


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