https://www.oracle.com/java/technologies/javase/8u-relnotes.html
https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
JDK 8u202(含)及之前的版本都可以免费使用,之后的版本商业用途收费!
Important Oracle JDK License Update
The Oracle JDK License has changed for releases starting April 16, 2019.