Log Files 

Log file directory: 

ApplicationServer-base\Setup\

Application Server instance log directory (default location for the initially created instance): 

JaveES-install-dir\appserver\

Message log file name: server.log, for each server instance.

Configuration Files 

Configuration file directory: ApplicationServer-base\Config.

Troubleshooting 

Refer to the Sun Java System Application Server Enterprise Edition Troubleshooting Guide.