原因分析：
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：
在tomcat中的context.xml文件中添加<Loader delegate="true" />
org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor
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