Caused by: java.lang.NoSuchMethodError:javax.servlet.http.HttpServletRequest.getServletContext()L
在做项目的时候，出现Caused by: java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.getServletContext()L这个问题，也就是使用request.getServletContext().getRealPath("/")这个报错。感觉好郁闷，看了别人写的文章，可能是tomcat版本号过低。我之前用的是tomcat6，如今我改成tomcat7，问题攻克了，故分享给大家
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java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.getHttpServletMapping()Ljavax/servlet/http/HttpServletMapping;
java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted()Z 的解决
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java.lang.NoSuchMethodError: javaxservlet.http.HttpServletRequest.isAsyncStarted()Z
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