HTTP Status 500 – Internal Server Error（網(wǎng)頁顯示）Type?Exception ReportMessage?Error instantiating servlet class [package com.imooc.servlet.Filstre]Description?The server encountered an unexpected condition that prevented it from fulfilling the request.Exceptionjavax.servlet.ServletException:?Error?instantiating?servlet?class?[package?com.imooc.servlet.Filstre] org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:748)Root Causejava.lang.ClassNotFoundException:?package?com.imooc.servlet.Filstre org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1360) org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1182) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:748)Note?The full stack trace of the root cause is available in the server logs.--------------------------------------------------------------------------------------------------------------package com.imooc.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Filstre extends HttpServlet{ @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name=request.getParameter("name"); String html="<h1 sryle='color'>hi"+name+"!</h1><hr>"; System.out.println("gfg"); PrintWriter out=response.getWriter(); out.print(html); }}----------------------------------------------------------------------------------------------------<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">? <display-name>Filstre</display-name>? <welcome-file-list>? ? <welcome-file>index.html</welcome-file>? ? <welcome-file>index.htm</welcome-file>? ? <welcome-file>index.jsp</welcome-file>? ? <welcome-file>default.html</welcome-file>? ? <welcome-file>default.htm</welcome-file>? ? <welcome-file>default.jsp</welcome-file>? </welcome-file-list>? <servlet>? <servlet-name>first</servlet-name>? <servlet-class>package com.imooc.servlet.Filstre</servlet-class>? </servlet>? <servlet-mapping>? <servlet-name>first</servlet-name>? <url-pattern>/hi</url-pattern>? </servlet-mapping></web-app>