Support newer JDK versions

[SchnWalter]

Feature Request

Cordova should support newer JDK versions. In pull request #446 a check was introduced to enforce the JDK version but no real reasoning was provided.

Motivation Behind Feature

Oracle has announced that the End of Public Updates of Java SE 8 is on December 2020.

Feature Description

Now that the JAVA 8 EOL is near, I think that all the issues in newer JDKs should be documented and a new tag should be added just for issues that prevent JDK updates.

[erisu]

Some other information to know is that Android Studio still uses OpenJDK 8 (openjdk version "1.8.0_202-release"). It does not use the Oracle's version if installed. It has its own bundled version.

If any changes were made, I suspect it to be for supporting OpenJDK 8 to be in line with what Android Studio uses. IMO.

[breautek]

The current version of Gradle that cordova-android requires also depends on java 8. Although in cordova-android@9, it will be using gradle 6.x, and they added support for up to JDK13.

Android Studio expects you to use Java 8. They don't officially support higher versions of java. So I believe this makes android studio the only blocker for a JDK upgrade. It doesn't mean android studio won't work in a higher JDK version, but it won't be guaranteed.

Android's docs where they talk about this can be found here

[jcesarmobile]

Android doesn’t use oracles java but their own implementation, which at the moment is like java 8. So this is an android limitation, not something cordova can fix.