No appenders could be found for logger

把日志文件从log4j升级到log4j2时出现了这个错误，这里记录其中的俩种可能解决办法。错误如下

log4j:WARN No appenders could be found for logger (io.netty.util.internal.logging.InternalLoggerFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

这里导致的原因是因为其中有个jar有log4j的依赖，jar文件如下

   <dependency><groupId>com.shanqian.service.thirdparty</groupId><artifactId>ccp-rest</artifactId><version>2.7.0</version></dependency>

这个jar自带有log4j所以出现那个错误，只要去除这个jar就没问题。但是这样显然是不好的。下面有俩种思路，我使用的是第二种。
1.使用去除log4j的依赖，这里需要知道导入的是哪些jar依赖了哪些log4j,如log4j，log4j-api等！！！

2.添加下面这个maven的依赖

   <dependency> <groupId>org.apache.logging.log4j</groupId><artifactId>log4j-1.2-api</artifactId><version>2.8.2</version></dependency>

这个jar的作用是后向前兼容：使用Log4j2实现log2j1.x的接口

我这里的问题就解决了！！！

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