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What about "4J" and "J" in database / API names

I used Twitter4j, linkedin-j, and I look at Neo4j and Bio4j. I also saw "Log4j" and many other database related names, with "j" and "4j" in them. I searched and I can not find anything that explains the link "j".

What about "j" / "4j"? What does it mean if anything?

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To my knowledge, this is a naming convention meaning "For Java", that is, a library for Java applications.

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Source: https://habr.com/ru/post/1204047/

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