maven项目报错如下：
1.Caused by: org.apache.catalina.LifecycleException:
Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
... 6 more
2.aused by: java.lang.NoClassDefFoundError: Lorg/slf4j/Logger;
解决方式1：
1.右键点击项目属性，看Deployment Assembly处是否加载了maven项目的jar包，如下图没有加jar包
2.点击加上如图所示：