如何检测丢失的LOG4J2配置？ [英] How to detect missing LOG4J2 config?

问题描述

我希望能够检测到应用程序何时缺少LOG4J2.XML配置文件，并且在这种情况下设置一些其他默认值，而不是LOG4J2的其他默认值。

I would like to be able to detect when the app is missing a LOG4J2.XML configuration file, and in that case set some other defaults than what LOG4J2 has otherwise.

基本上，如果找不到配置文件，我想运行此代码：

Basically, I would like to run this code if a config file isnt found:

    // A default configuration that shows ALL Logger output, without a XML config!
    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration config = ctx.getConfiguration();
    LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME); 
    loggerConfig.setLevel(Level.ALL);
    ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.        

如何检测到LOG4J2无法加载配置？

How can I detect that LOG4J2 failed to load a configuration?

推荐答案

似乎... ...

if (config instanceof DefaultConfiguration)

...就足够了，因为只要没有其他可用的东西就使用DefaultConfiguration，请参阅有关Log4j2配置的文档：

...would be enough, since DefaultConfiguration is used whenever there is nothing else available, see the documentation for Log4j2 configuration:

如果找不到配置文件，将使用 DefaultConfiguration
。这将导致日志记录输出进入控制台。

If no configuration file could be located the DefaultConfiguration will be used. This will cause logging output to go to the console.

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