org.springframework.web.servlet.DispatcherServlet cannot be cast to javax.servle
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from http://chenzehe.iteye.com/blog/1466031
调试Spring MVC时发现如下异常：
java.lang.ClassCastException: org.springframework.web.servlet.DispatcherServlet cannot be cast to javax.servlet.Servlet
问题出在servlet-api.jar上，tomcat部署springMVC项目时是不用这个包的,而用maven构建项目时需要,如果不引用该依赖就会不识别 HttpServletRequest等的类
解决方法是在maven引用servlet的依赖时，加上属性范围<scope>provided</scope>
而在引用javax.servlet.jsp的依赖时，如果也没有加上 属性范围<scope>provided</scope>，则也会抛出如下异常：
org.apache.jasper.JasperException: Unable to read TLD "META-INF/c.tld" from JAR file "file:/E:/chenzehe/mvnrepo/javax/servlet/jstl/1.2/jstl-1.2.jar": org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV
附：
依赖范围（scope）主源码classpath可用测试源码classpath可用会被打包compile 缺省值TRUETRUETRUEtestFALSETRUEFALSEruntimeFALSETRUETRUEprovidedTRUETRUEFALSE
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