環(huán)境配置好的，包括JDK ，服務(wù)器正常啟動(dòng)，就是localhost頁(yè)面打不開，顯示：

description The server encountered an internal error () that prevented it from fulfilling this request.

HTTP?Status?500?-
type?Exception?report
message?
description?The?server?encountered?an?internal?error?()?that?prevented?it?from?fulfilling?this?request.
exception?
org.apache.jasper.JasperException:?Unable?to?compile?class?for?JSP:?

An?error?occurred?at?line:?1?in?the?generated?java?file
The?type?java.util.Map$Entry?cannot?be?resolved.?It?is?indirectly?referenced?from?required?.class?files

Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:469)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

note?The?full?stack?trace?of?the?root?cause?is?available?in?the?Apache?Tomcat/7.0.27?logs.