Errors building Mantis from source following official docs about mantis

[calvin681]

I think this issue is due to JDk17. Try using JDK8 to build. https://sdkman.io/ would be helpful in managing multiple java versions.

[jpittis]

Thanks so much. After installing sdkman, I was able to successfully build Mantis using JDK8:

$ sdk install java 8.0.392-amzn
$ ./gradlew --info --stacktrace build --warning-mode=all
BUILD SUCCESSFUL in 4m 6s

We should action this ticket by updating the docs from claiming "JDK 8 or higher" to just "JDK 8" and potentially mention sdkman as well as a recommended vendor and version.