Notes

Java

Java 8 API - https://docs.oracle.com/javase/8/docs/api/
Java 9 API - https://docs.oracle.com/javase/9/docs/api/overview-summary.html
Java 10 API -https://docs.oracle.com/javase/10/docs/api/overview-summary.html
Java 11 API - N/A

Apache Commons - https://commons.apache.org/
Common lang (3.9) - https://commons.apache.org/proper/commons-lang/javadocs/api-3.9/index.html
Common lang (2.6) - https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/index.html