本人是一位正在学习java和tomcat的学生，有诸多不懂
eclipse中：
HTTP状态 500 - 内部服务器错误
类型 异常报告
消息 org.apache.jasper.JasperException: 无法为JSP编译类
描述 服务器遇到一个意外的情况，阻止它完成请求。
例外情况
org.apache.jasper.JasperException: org.apache.jasper.JasperException: 无法为JSP编译类
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:589)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:425)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
根本原因。
org.apache.jasper.JasperException: 无法为JSP编译类
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:621)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
根本原因。
java.lang.RuntimeException: org.apache.jasper.JasperException: /WEB-INF/tags/oddNumberSum.tag (行.: [2], 列: [4]) 无效指令
org.apache.jasper.compiler.ImplicitTagLibraryInfo.getTagFile(ImplicitTagLibraryInfo.java:186)
org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1232)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1475)
org.apache.jasper.compiler.Parser.parse(Parser.java:144)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:105)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:391)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:367)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:605)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
根本原因。
org.apache.jasper.JasperException: /WEB-INF/tags/oddNumberSum.tag (行.: [2], 列: [4]) 无效指令
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:292)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:98)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:516)
org.apache.jasper.compiler.Parser.parseFileDirectives(Parser.java:1802)
org.apache.jasper.compiler.Parser.parse(Parser.java:141)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
org.apache.jasper.compiler.ParserController.parseTagFileDirectives(ParserController.java:172)
org.apache.jasper.compiler.TagFileProcessor.parseTagFileDirectives(TagFileProcessor.java:501)
org.apache.jasper.compiler.ImplicitTagLibraryInfo.getTagFile(ImplicitTagLibraryInfo.java:180)
org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1232)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1475)
org.apache.jasper.compiler.Parser.parse(Parser.java:144)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:105)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:391)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:367)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:605)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看
Apache Tomcat/9.0.53
这是console中的：
在路径为/a的上下文中，Servlet[jsp]的Servlet.service（）引发了具有根本原因的异常org.apache.jasper.JasperException: 无法为JSP编译类
org.apache.jasper.JasperException: /WEB-INF/tags/oddNumberSum.tag (行.: [2], 列: [4]) 无效指令
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:292)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:98)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:516)
at org.apache.jasper.compiler.Parser.parseFileDirectives(Parser.java:1802)
at org.apache.jasper.compiler.Parser.parse(Parser.java:141)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
at org.apache.jasper.compiler.ParserController.parseTagFileDirectives(ParserController.java:172)
at org.apache.jasper.compiler.TagFileProcessor.parseTagFileDirectives(TagFileProcessor.java:501)
at org.apache.jasper.compiler.ImplicitTagLibraryInfo.getTagFile(ImplicitTagLibraryInfo.java:180)
at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1232)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1475)
at org.apache.jasper.compiler.Parser.parse(Parser.java:144)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:105)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:391)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:367)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:605)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1726)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
是不是缺少jsp.jar包或者jsp页面导包不对。
<%@ page language="java" import="包名"%>
一样的问题，你解决了吗