Very fast Python script to take a quick look at your GlassFish server.log file.

Output:

Fecha Inicio: [2014-10-13T23:54:54.372+0200] Fecha Fin: [2014-10-16T13:46:22.230+0200] Total INFO: 826 Total WARN: 126 Total SEVERE: 2341 Total ERROR: 96 Total Processing: 3389 Total Exceptions: 0 Total logfile lines: 13646

The script: