Minimum Java version for netCDF-Java

[lesserwhirls]

Currently, the netCDF-Java project targets version 8 of the JVM. We are looking to get a feel for the minimum version required by the community, as support for Java 8 begins to dwindle for 3rd party dependencies that the project relies upon.

[rschmunk]

FWIW: Panoply has required Java 11 since summer 2022. I don't recall specifically why 11 other than it's LTS. Before that it had required Java 9 for a year and a half because it uses desktop classes that were added with that version, and which replaced some macOS-specific classes that Apple used to provide in their distro of Java.

I do hear from the occasional user that their institution won't install anything newer than Java 8 and can I provide them a copy of compatible Panoply. Not often, but it still happens. Probably due to the licensing changes with Java 9.