- 原因之一:JDK版本与Tomcat版本不匹配,jdk8 yyds
首先可以确认的Tomcat中的webapps文件中有actviti-app的war包

> at org.apache.catalina.loader.WebappClassLoaderBase.clearCache(WebappClassLoaderBase.java:2268)
> at org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesObjectStreamClassCaches(WebappClassLoaderBase.java:2255)
> at org.apache.catalina.loader.WebappClassLoaderBase.clearReferences(WebappClassLoaderBase.java:1627)
> at org.apache.catalina.loader.WebappClassLoaderBase.stop(WebappClassLoaderBase.java:1555)
> at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:449)
> at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
> at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5431)
> at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:187)
> at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
> at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
> at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)