log4j:WARN No appenders could be found for logger (com.alibaba.dubbo.common.

springboot整合dubbo时，会发生log4j重复加载的问题，可以查看那些依赖使用了log4j，增加sxclude排除即可

 在pom.xml里面，zookeeper排除slf4j-log4j12和log4j

        
            org.apache.zookeeper
            zookeeper
            3.4.8
            
                
                
                    org.slf4j
                    slf4j-log4j12
                
                
                
                    log4j
                    log4j