To keep track of the Archiva performance and problems, log files are created during runtime. These files can be found in the logs/ directory.
Note since 2.1.0, the log4j2 asyncLogger feature is NOT anymore configured as the default.
If you want to activate it as default add the system property -DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
This means the default AsyncLogger.WaitStrategy and AsyncLoggerConfig.WaitStrategy option is Sleep.
If you are in a constrained environment, you can change it to Block (or Yield) (-DAsyncLogger.WaitStrategy=Block and/or -DAsyncLoggerConfig.WaitStrategy=Block)
(See log4j2 documentation )