问题描述：线上新上项目没有生成日志文件，看tomcat下logs里的日志报
05-May-2017 14:58:31.205 WARNING [RMI TCP Connection(2)-127.0.0.1] org.apache.catalina.webresources.Cache.getResources Unable to add the resource at [/WEB-INF/classes/org/slf4j/impl/StaticLoggerBinder.class] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/niuhonglei/myApps/apache-tomcat-hawkeye/webapps/malm-hawkeye/WEB-INF/lib/logback-classic-1.1.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/niuhonglei/myApps/apache-tomcat-hawkeye/webapps/malm-hawkeye/WEB-INF/lib/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
感觉是说明是log4j12与logback-classic冲突，
执行maven命令：mvn dependency:tree
然后搜索log4j12，就会发现有其他jar引入了log4j12，然后修改pom文件，添加过滤
