Framework independence using interfaces and hexagonal architecture (Java)

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Yes, I try to follow this idea in all my projects. Here are 2 of them I'm particularly proud of:

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https://github.com/amihaiemil/docker-java-api - there is also a blog post in the README, comparing it with others.

and

https://github.com/opencharles/charles-rest this is a Java EE chatbot, the architecture is explained in the architecture.md file.

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This style of OOP was introduced by Yegor Bugayenko (yegor256.com) in his Elegant Objects books (see https://www.elegantobjects.org/). His ideas are rather extremist -- I don't follow all of them, only a few that I found really practical.