查看日志信息：
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/app/apache-tomcat-docbase/mmsi/WEB-INF/lib/slf4j-simple-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/app/apache-tomcat-docbase/mmsi/WEB-INF/lib/logback-classic-1.0.13.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.slf4j.impl.SimpleLoggerFactory]
解釋：
SLF4J: 類路徑包含多個SLF4J綁定
SLF4J: ——
SLF4J: ——
SLF4J: ——
SLF4J: 實際綁定的是類型[org.slf4j.impl.SimpleLoggerFactory]
解決辦法，移除slf4j-simple-1.6.4.jar
如何發現該問題：