Log4j 2.如何获取log4j的调试消息? [英] Log4j 2. How get log4j's debug messages?

问题描述

据我了解，log4j可以处理系统属性-Dlog4j.debug.如果使用它运行应用程序，则将获得log4j的调试输出.

As far as i understand log4j can handle system property -Dlog4j.debug. If you run your app with it you will get log4j's debug output.

示例:java -Dlog4j.debug -jar test.jar

Example: java -Dlog4j.debug -jar test.jar

log4j 2是否有类似的东西?

Is there something similar for log4j 2?

推荐答案

2018年1月更新:

Update January 2018:

从Log4j 2.10开始，这很容易:只需使用系统属性 log4j2.debug (无需任何值；可以使用空字符串)运行程序.

From Log4j 2.10, this is easy: just run your program with system property log4j2.debug (no value needed; an empty string is fine).

关于状态记录器的当前 (log4j-2.1) 文档有点混乱.基本上:

The current (log4j-2.1) documentation on the status logger is a bit confusing. Basically:

• 在找到配置之前，可以使用系统属性 org.apache.logging.log4j.simplelog.StatusLogger.level 控制状态记录器级别.
• 找到配置后，可以使用"status"属性在配置文件中控制状态记录器级别，例如:< Configuration status ="trace"> .

• Until a configuration is found, status logger level can be controlled with system property org.apache.logging.log4j.simplelog.StatusLogger.level.
• After a configuration is found, status logger level can be controlled in the configuration file with the "status" attribute, for example: <Configuration status="trace">.

更新:文档在log4j-2.2中得到了改进

UPDATE: the documentation was improved in log4j-2.2.

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