症状的原因网上的资料说是jar包冲突即Tomcat中catalina.jar和jasper.jar都有AnnotationProcessor接口，所以运行时，就出错了：java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor。
解决方法有2个：
（1）修改tomcat的context配置文件
在<context></context>之间加下面的代码<Loader delegate="true" />
（2）把项目下lib文件下和tomcat的jar的重复的全部删除。
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