You would see 6-7 lines of log4j:WARN messages when you start Platform Server from the batch file(ServerStartup.bat)

Applies To: Platform Server 2015

These warnings are coming from log4j; the logging API by Apache Software Foundation. We are using log4j 1.2.17 API. These warnings are the due the defects in log4j API but Apache Software Foundation stopped supporting this version of API and bugs are still opened. These are just the warnings and wouldn’t affect any functionality.