Slf4j 1.7.28 doesn`t work correctly with Java 11 and gelfj-1.1.14

Hello && Welcome

I adjusted you post to make the error logs more readable. when posting configuration files or Logs, please use the markdown, if your unsure you can look here
As for your

I’m not exactly sure what’s going on in your environment. What I do know is you have installed some other software ( i.e. slf4j 1.7.28,) that seams to not work. Could you explain in greater detail?
To be honest , I’ve never hear of that software before.

From the logs it looks like Apache and slf4j 1.7.28 do not play well with each other.