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You are probably running Gradle with java 8, and the plugins are compiled for Java 11.

you can run `gradle wrapper` in any (even empty) project and copy it over if your current project has configuration issues

but if you can find out which plugins are requiring Java 11, maybe complain to them? Gradle still supports running on Java 8 and ideally so should plugins

Some indeed do not and for some it also seems ok. grgit plugin for example, because it uses a recent version of JGit which also just supports Java 11 now.
But for most plugins it would be nice if they supported Java 8, yes.

Right, in my case it was for quarkus which supports Java 11.. so I'm not sure this would be useful 