The error log contains diagnostic information and records any errors that it encounters in processing requests.
错误日志包含诊断信息,并记录在处理请求时遇到的任何错误。
2
If not in silent mode, these errors cause a diagnostic error message and OPTARG is unset.
如果不是在静默模式,则这些错误将导致一条诊断错误消息而OPTARG不会被设置。
3
JRas lets you to turn on diagnostic information when problems arise, producing trace logs to help identify unexpected conditions or programming errors.