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Re:JDK 21 Release Notes by kaba0 on Tuesday September 19, 2023 @11:46AM (#37571637)
Java’s reference implementation is OpenJDK, developed mostly by Oracle, and is completely open-source (GPL-2).

One can optionally buy support for it, that’s the whole deal. Not that hard, but apparently this is a minefield for some..

Re:JDK 21 Release Notes by freeone3000 on Tuesday September 19, 2023 @12:04PM (#37571971)
There’s that and there’s https://www.oracle.com/ca-en/downloads/licenses/binary-code-... , where using the wrong runtime flag makes you owe money.
Re:JDK 21 Release Notes by samus on Tuesday September 19, 2023 @06:39PM (#37578011)
Don't use them commercial features if you don't be want to pay for them. And don't download the Enterprise Oracle JRE from the Oracle website if you don't want to use them commercial features. We all should read terms&conditions more carefully.