Gradle configuration was checked and updated to the 8 version. #333
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I'm a bit new to java and Gradle, but it seems useful.
I've installed the intellij idea with the latest gradle and jdk onboard, but I've realized that cannot build the project with it.
Then, using this tutorial https://docs.gradle.org/current/userguide/upgrading_version_7.html has updated the gradle version since there are no warnings through.