Style checkers for the Java code

[t0yv0]

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Issue details

Enable style checkers for the Java code.

From @pawelprazak: I believe checkstyle is the de facto standard: https://checkstyle.sourceforge.io/#:~:text=Overview,to%20enforce%20a%20coding%20standard. https://docs.gradle.org/current/userguide/checkstyle_plugin.html

Affected area/feature

[pawelprazak]

It is tempting for me to just re-use Google's Java style guide. It is opinionated a bit, I personally don't mind. https://github.com/google/google-java-format https://plugins.gradle.org/plugin/com.github.sherter.google-java-format

The biggest upside for me would be not having to decide on what thousands of programmers spent uncountable hours arguing about. I love what Go did, fmt is in language toolchain.

This is a bit like google's go fmt.

[pawelprazak]

As for a linter, this one looks very good: https://github.com/tbroyer/gradle-errorprone-plugin https://github.com/google/error-prone

[philipp-paland]

Google Java Format is a good default if you don't want to think about how exactly you want the code to look like.