4.ダウンロードしたFlutterのバージョンをインストールします。 これらの手順を実行することで、「Unsupported class file major version xx」のエラーを解決することができます。

Hi! I think the version of Java you're running is probably a little too new for the JAFFA pipeline manager. It's probably easier to use Docker, which uses a static, supported Java version. Can you try ...

Sudhesh RAJAN SHARMA opened MDEP-663 and commented Class file of major version 57 (Java 13) is not yet supported by Maven Dependency Plugin. While executing goal org.apache.maven.plugins:maven-depe ...