为什么Log4J2在log4j2-test.xml之后就停止了，不再继续寻找log4j2.xml？

Question

我有 2 个应用程序都在寻找 log4j2.xml。一个找到一个没有。

将此添加到 jvm 后：-Dlog4j.debug（使用 2.11.2 的所有内容）

第一个正确运行的应用程序扫描并找到文件：

第二个app在log4j2后停止扫描-test.xml

我

当我将 log4j2-test.xml 添加到第二个应用程序时，它会找到它并正常工作。显然存在差异（应用程序非常相似）但找不到。有任何想法吗？什么会导致 Log4j2 停止扫描 属性 文件？

Answer 1

由于 Log4j2 查找配置的顺序。

1. Log4j will inspect the "log4j.configurationFile" system property and, if set, will attempt to load the configuration using the ConfigurationFactory that matches the file extension.
2. If no system property is set the properties ConfigurationFactory will look for log4j2-test.properties in the classpath.
3. If no such file is found the YAML ConfigurationFactory will look for log4j2-test.yaml or log4j2-test.yml in the classpath.
4. If no such file is found the JSON ConfigurationFactory will look for log4j2-test.json or log4j2-test.jsn in the classpath.
5. If no such file is found the XML ConfigurationFactory will look for log4j2-test.xml in the classpath.
6. If a test file cannot be located the properties ConfigurationFactory will look for log4j2.properties on the classpath.
7. If a properties file cannot be located the YAML ConfigurationFactory will look for log4j2.yaml or log4j2.yml on the classpath.
8. If a YAML file cannot be located the JSON ConfigurationFactory will look for log4j2.json or log4j2.jsn on the classpath.
9. If a JSON file cannot be located the XML ConfigurationFactory will try to locate log4j2.xml on the classpath.
10. If no configuration file could be located the DefaultConfiguration will be used. This will cause logging output to go to the console.

参考：https://logging.apache.org/log4j/2.x/manual/configuration.html#AutomaticConfiguration