Thanks for your fast reponse.
To be honest, I don't know what I can tell you to give more information. I am really confused.
In my opinion checkstyle-result.xml contains all scanned files and the errors/warnings of the check.
In my case the file checkstyle-result.xml contains only all scanned files and the console tells me there a X errors.
Finally I found my mistake ... I did run first checkstyle:checkstyle on the tests resources and run checkstyle:check on main using in both cases the same outputFile.
I was expecting that checkstyle:check just breaks and don't dump any file.
That explains the checkstyle-result.xml on Jenkins containing only scanned files from main.
The real background behind this issue was that Jenkins doesn't load any checkstyle-result.xml any more. I think it was overwritten by the two executions.
Can you please elaborate?
Is there a warning in checkstyle-result.xml of Warehouse Parent POM?
What do you mean with suddenly? Did you change anything in your setup?
Are there other result files that are not parsed?