Log Message not display when is launched by external process

Hi, My working project has a need which is launching multiple dedicated servers on a single machine, so I decided writing a JAVA application to manage them. This is my code

which is a standard JAVA Process. and BufferedReader to read log from UE4 Dedicated Server. But the inputstream got are warning messages only shown below.

And I have try to launch the dedicated server with an argument “-log”, the console is shown but no message at all.

Any advice will be thankful.

Hey ZenTechEntertainment,

Thank you for taking the time to report this issue, and we appreciate your patience while awaiting a response. In order to assist you in an effective manner, we would like to see if you are still experiencing the issue you are reporting in engine versions 4.8.3 and/or 4.9.2, and if you were able to get the custom code integrated and working?

Thank you,