log4js_configuration.json

{
  "appenders": {
    "logger": {
      "type": "file",
      "filename": "log/app.log",
      "maxLogSize": 10240000,
      "numBackups": 10,
      "category": "logger"
    }
  },
  "categories": {
    "default": {
      "appenders": [
        "logger"
      ],
      "level": "trace"
    }
  }
}