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[simoncn]

Java 8 (the same as 1.8) is a very old version of Java, first released in 2014 and patched with updates since then. Java 21 is a much more recent version of Java (released in 2023) and has a number of improvements over Java 8. For example, with Java 21 the MinimServer and MinimWatch menu bar icons support transparency and adjust for light and dark desktop colour schemes.