You can do better now:

    #!/usr/bin/env java --source 25
    void main() {
        IO.println("Hello, World!");
    }

https://openjdk.org/jeps/330 https://openjdk.org/jeps/458 https://openjdk.org/jeps/512

I often combine these approaches with https://get-coursier.io/ when I need to fetch third-party dependencies.