There's an Oracle jdk whose usage terms need to be deciphered using a lawyer to understand precisely when and how you can use it. So much that the average advice is to not use it. Like if they told you "hey, node.js is cool but don't use the one from those who maintain and develop the code". This would be a huge red flag for any other language than Java, which can leverage 30 years of sunk costs for companies that now will not switch lightly to something else.
The alternative builds are good, yet not official and they might introduce thin incompatibilities or different behaviors. They should not but this whole article suggests that they actually do.
The simple existence of articles like this one testifies that this is a mess for a lot of people.
