What is the exact Google Java Format version used by CheckStyle 9.3?

Question

I use Checkstyle 9.3 (because I'm still using JDK 8). I'm wondering what is the exact Google Java Format version used by that Checkstyle version? I'm referring to the following file:

https://github.com/checkstyle/checkstyle/blob/checkstyle-9.3/src/main/resources/google_checks.xml

I tried to figure it out. I see a date on the following page stating "version of 23 May 2018, current as of 07 May 2019". Maybe I missed something.

https://checkstyle.org/google_style.html

I think this is either version 1.6 or 1.7.

• https://javadoc.io/doc/com.google.googlejavaformat/google-java-format/1.6/index.html
• https://javadoc.io/doc/com.google.googlejavaformat/google-java-format/1.7/index.html

This is important to know because I'm using a program to reformat the code automatically, for instance google-java-format. Then I need to know which release to choose here:

https://github.com/google/google-java-format/releases

Thank you

Jonathan