在學習maven項目的拆分與聚合時遇到錯誤：java.lang.ClassNotFoundException: org.apache.jsp.index_jsp

啟動tomcat 控制台列印的錯誤資訊為：

八月 13, 2018 11:33:13 上午 org.apache.catalina.core.StandardWrapperValve invoke
嚴重: Servlet.service() for servlet [jsp] in context with path [/Myservlet] threw exception [java.lang.ClassNotFoundException: org.apache.jsp.index_jsp] with root cause
java.lang.ClassNotFoundException: org.apache.jsp.index_jsp
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
	at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132)
	at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:119)
	at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:376)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
           

桌面列印出現的錯誤提示如下：

但在位址欄輸入

http://localhost:8080/Myservlet/servlet
           

控制台列印

servlet層的方法調用了
service層的方法執行了
dao層中的方法執行了
           

出于初學maven，我首先将各目錄結構配置檢查了一遍，又怕不仔細，又建立了一次項目，但依然報相同的錯誤

這說明maven本身沒有出錯，錯誤出現在jsp的jar包上

我用的jap的jar包是

<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
        </dependency>
           

為了友善起見，我去中央倉庫下載下傳了javaee的jar包

<dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
           

此時，我重新開機tomcat,程式正常運作，頁面彈出引導頁面index.jsp的内容

說明：

  這個錯誤也可以通過修改jsp的版本來解決，但由于比較麻煩，不贊成