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问题描述
log4j.rootCategory log4j.properties 中的字段可以有 4 个不同的值，即:
DEBUG,WARN,INFO and ERROR.你能告诉我哪个最适合什么情况吗?
推荐答案
从最不严重到最严重:
ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF
如果您选择其中之一，log4j 将打印该类型和更严重类型的所有消息.
目的:
- ALL:打印所有消息*
- DEBUG:调试消息
- INFO:没有问题的信息
- WARN:不是错误，而是可能导致未来错误的东西
- ERROR:出现问题，应用程序管理的问题，应用程序可以停止或不停止，通常必须报告
- FATAL:导致应用程序崩溃的错误
- OFF:不打印任何消息*
(*) 这些只是关键字；对于这些类别，没有方法 all(msg) 和 off(msg)，就像我们有 error(msg) 或 debug(msg).
通常在开发期间我设置为 ALL 或 DEBUG，而在部署时我设置为 INFO 或 WARN.
问题描述
log4j.rootCategory feild in log4j.properties can have 4 different values namely:
DEBUG,WARN,INFO and ERROR. Can you tell me which is most suitable for what cases?
推荐答案
From the least severe to the most one:
ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF
If you choose one of them log4j will print all messages of that type and of more severe type.
Purposes:
- ALL: prints all messages*
- DEBUG: debug messages
- INFO: information that aren't problems
- WARN: not error but something that could cause a future error
- ERROR: something went wrong, a problem that the application manages, the application could be stopped or not, usually must be reported
- FATAL: an error that crashes the application
- OFF: prints no messages*
(*) these are only keywords; for these categories there are no methods all(msg) and off(msg), like we have error(msg) or debug(msg).
Usually during development I set to ALL or DEBUG, while when deployed I set to INFO or WARN.
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