日志jar包沖突報錯：Class path contains multiple SLF4J bindings

　　問題現象：tomcat啟動卡死，報錯日志如下：

十一月 07, 2017 8:35:45 下午 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring root WebApplicationContext
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/E:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ms-notify/WEB-INF/lib/log4j-slf4j-impl-2.9.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/E:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ms-notify/WEB-INF/lib/slf4j-log4j12-1.7.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]

　　問題定位：從日志里看到兩個日志jar包沖突了：log4j-slf4j-impl-2.9.1.jar和slf4j-log4j12-1.7.2.jar

　　解決問題：根據日志給出的本地tomcat路徑，進入到lib下，刪除其中一個，這里進入E:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ms-notify/WEB-INF/lib，刪除log4j-slf4j-impl-2.9.1.jar，重啟即可。