环境日常01

1. 前情介绍

今天我像往常一样，执行脚本，拉代码，推代码，更新到服务器，全程看着日志，没有报错，嘴角疯狂上扬，然而。。。意想不到的事情发生了！！！

登录的时候报错了，前台报错，500 - Unable to compile class for JSP。

2. 错误信息

如下：

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: [35] in the generated java file: [/opt/TestTomcat/apache-tomcat-7.0.69/work/Catalina/localhost/adassist3/org/apache/jsp/index_jsp.java]
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory

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)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:209)
	com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:244)
	org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

3. 解决办法

在网上查了很久，原因可能是jar包冲突，于是实际操作了一把：

1）在tomcat/lib路径下找到servlet-api.jar，jsp-api.jar；

2）在项目路径下：项目/WEB-INF/lib 中找到 servlet-api.jar，jsp-api.jar；

3）确认之后，把项目下的这两个jar包删除；

4）重新启动tomcat，顺利登陆，问题搞定。