main ERROR processing element appender configuration: null:CLASS_NOT_FOUND【解决方法】

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问题场景
springboot框架项目，为了兼容老项目，将日志系统改造为log4j。启动项目之后，日志报错，提示如下：

2020-12-24 15:01:08,452 main ERROR Error processing element appender ([configuration: null]): CLASS_NOT_FOUND
2020-12-24 15:01:08,453 main ERROR Unknown object "property" of type org.apache.logging.log4j.core.config.Property is ignored: try nesting it inside one of: ["Appenders", "Loggers", "Properties", "Scripts", "CustomLevels"].
2020-12-24 15:01:08,454 main ERROR Unknown object "property" of type org.apache.logging.log4j.core.config.Property is ignored: try nesting it inside one of: ["Appenders", "Loggers", "Properties", "Scripts", "CustomLevels"].
2020-12-24 15:01:08,456 main ERROR Unknown object "root" of type org.apache.logging.log4j.core.config.LoggerConfig is ignored: try nesting it inside one of: ["Appenders", "Loggers", "Properties", "Scripts", "CustomLevels"].

问题原因
因为项目是微服务项目，使用了配置中心进行项目配置管控。其中，common默认的日志文件是logback.xml。而项目移除了logback的相关依赖，引入了log4j的相关依赖。但是忘记修改日志文件路径，导致了还是默认的日志文件。而logback文件使用的语法是logback的，与log4j不符。导致项目启动之后，按照配置读取报错，导致日志输出异常。

解决方案
设置logging.config为classpath:log4j2.xml，重新启动项目；