报错信息如下
2021-10-11 10:46:07.508 ERROR 10820 --- [nio-7000-exec-1] o.s.b.w.servlet.support.ErrorPageFilter : Forwarding to error page from request [/index.jsp] due to exception [Unable to compile class for JSP] org.apache.jasper.JasperException: Unable to compile class for JSP at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:610) ~[jasper.jar:8.5.31] at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368) ~[jasper.jar:8.5.31] at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) ~[jasper.jar:8.5.31] at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) ~[jasper.jar:8.5.31] at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-websocket.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:126) ~[spring-boot-2.5.5.jar:2.5.5] at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:64) ~[spring-boot-2.5.5.jar:2.5.5] at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:101) ~[spring-boot-2.5.5.jar:2.5.5] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:119) ~[spring-boot-2.5.5.jar:2.5.5] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.31] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[catalina.jar:8.5.31] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[catalina.jar:8.5.31] at org.apache.catalina.authenticator.Authenticatorbase.invoke(Authenticatorbase.java:496) ~[catalina.jar:8.5.31] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) ~[catalina.jar:8.5.31] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) ~[catalina.jar:8.5.31] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) ~[catalina.jar:8.5.31] at org.apache.catalina.core.StandardEnginevalve.invoke(StandardEnginevalve.java:87) ~[catalina.jar:8.5.31] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) ~[catalina.jar:8.5.31] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) ~[tomcat-coyote.jar:8.5.31] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-coyote.jar:8.5.31] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) ~[tomcat-coyote.jar:8.5.31] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) ~[tomcat-coyote.jar:8.5.31] at org.apache.tomcat.util.net.SocketProcessorbase.run(SocketProcessorbase.java:49) ~[tomcat-coyote.jar:8.5.31] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-util.jar:8.5.31] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] Caused by: javax.el.ELException: Unable to find expressionFactory of type: # Licensed to the Apache Software Foundation (ASF) under one or more at javax.el.expressionFactory.newInstance(expressionFactory.java:154) ~[el-api.jar:3.0.FR] at javax.el.expressionFactory.newInstance(expressionFactory.java:93) ~[el-api.jar:3.0.FR] at org.apache.jasper.compiler.PageInfo.第一次尝试加入jsp-api依赖(PageInfo.java:79) ~[jasper.jar:8.5.31] at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:116) ~[jasper.jar:8.5.31] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:374) ~[jasper.jar:8.5.31] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351) ~[jasper.jar:8.5.31] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335) ~[jasper.jar:8.5.31] at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:595) ~[jasper.jar:8.5.31] ... 45 common frames omitted Caused by: java.lang.ClassNotFoundException: # Licensed to the Apache Software Foundation (ASF) under one or more at org.apache.catalina.loader.WebappClassLoaderbase.loadClass(WebappClassLoaderbase.java:1308) ~[catalina.jar:8.5.31] at org.apache.catalina.loader.WebappClassLoaderbase.loadClass(WebappClassLoaderbase.java:1136) ~[catalina.jar:8.5.31] at javax.el.expressionFactory.newInstance(expressionFactory.java:147) ~[el-api.jar:3.0.FR] ... 52 common frames omitted
javax.servlet.jsp jsp-api2.2
结果失败
第二次怀疑与springboot内置tomcat冲突查询springboot排除内嵌的tomcat方法，其中有两个方法：
1.exclusions 排除打包的jar包org.springframework.boot spring-boot-starter-weborg.springframework.boot spring-boot-starter-tomcat
结果依然报错
2.scope设置为：provided：已提供范围provided 的dependency 由JDK或者容器提供。
已提供范围的依赖在编译classpath （不是运行时）可用。它们不是传递性的也不会被打包。
org.springframework.boot spring-boot-starter-webprovided
此方法成功了
