今天调试代码，发现抛出这个异常：
HTTP Status 500 - Unable to compile class for JSP:
type Exception report
message Unable to compile class for JSP:
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: [/data/services/tomcat_base/service.xxxxxxx/work/Catalina/localhost/_/org/apache/jsp/WEB_002dINF/content/auth/login_005ffail_jsp.java]
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:103)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:490)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:379)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:662)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1221)
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
com.yy.vip.filter.XssFilter.doFilter(XssFilter.java:29)
com.yy.vip.shared.commons.filter.AbstractPreHandleFilter.doFilter(AbstractPreHandleFilter.java:76)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.68 logs.
根据提示，是tomcat没有把jsp成功编译成class文件，导致进程运行时，请求找不到相应的jsp.
解决问题思路：
1.版本冲突，服务器java版本1.8, pom.xml的配置java版本配置成1.8
2.包冲突 tomcat没有生成相应的class文件，可能是tomcat1.7 jdk1.8, 删除 /data/services/tomcat-7.0.42.6/lib下的ecj-3.7.2.jar
重启即可