JDK main-line development https://openjdk.org/projects/jdk
https://wiki.openjdk.org/display/jdk8u
https://openjdk.org/projects/leyden
https://openjdk.org/projects/jdk/19 released 2022-09-20
https://openjdk.org/projects/shenandoah
https://wiki.openjdk.org/display/CodeTools/JT+Harness
https://wiki.openjdk.org/display/CodeTools/jcov
OpenJDK Developers' Guide https://openjdk.org/guide
https://openjdk.org/projects/code-tools/apidiff
https://openjdk.org/projects/valhalla
https://openjdk.org/projects/code-tools/doccheck
https://wiki.openjdk.org/display/CodeTools/sigtest
