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POTomcat ClassNotFoundException for HttpServlet
 

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  1. POTomcat ClassNotFoundException for HttpServlet
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    <p>We are getting a <code>java.lang.ClassNotFoundException: HttpServlet</code> with a JSP project running on the Apache Tomcat server (v5.5) in Eclipse. The lib folder under Web-inf does have the servelt-api jar. And furthermore we have imported the javax.servlet.http.* library. But still we are getting this exception. </p> <pre><code>package com.bean; import java.io.*; import java.util.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; public class AdminLogin extends HttpServlet{ ArrayList list=new ArrayList(); public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ try{ response.setContentType("text/html"); PrintWriter out=response.getWriter(); String id=request.getParameter("user"); String pass=request.getParameter("pass"); System.out.println("ID==================&gt;&gt;"+id+"PASS========&gt;&gt;"+pass); if(id.equalsIgnoreCase("admin")&amp;&amp;pass.equalsIgnoreCase("admin")) { response.sendRedirect("AdminPage.jsp"); } else { response.sendRedirect("Failure.html"); } } catch (Exception e) { e.printStackTrace(); } } } </code></pre> <p>Error Stack Trace:</p> <pre><code>java.lang.NoClassDefFoundError: HttpServlet java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClassCond(Unknown Source) java.lang.ClassLoader.defineClass(Unknown Source) java.security.SecureClassLoader.defineClass(Unknown Source) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:873) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1326) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870) org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685) java.lang.Thread.run(Unknown Source) root cause java.lang.ClassNotFoundException: HttpServlet org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205) java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClassCond(Unknown Source) java.lang.ClassLoader.defineClass(Unknown Source) java.security.SecureClassLoader.defineClass(Unknown Source) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:873) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1326) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870) org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685) java.lang.Thread.run(Unknown Source) </code></pre> <p>Web.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"&gt; &lt;display-name&gt;CarPooling&lt;/display-name&gt; &lt;servlet&gt; &lt;description&gt; &lt;/description&gt; &lt;display-name&gt;AdminLogin&lt;/display-name&gt; &lt;servlet-name&gt;AdminLogin&lt;/servlet-name&gt; &lt;servlet-class&gt;com.bean.AdminLogin&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet&gt; &lt;servlet-name&gt;employee&lt;/servlet-name&gt; &lt;servlet-class&gt;com.bean.UserLogin&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;AdminLogin&lt;/servlet-name&gt; &lt;url-pattern&gt;/demo&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;employee&lt;/servlet-name&gt; &lt;url-pattern&gt;/login&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;welcome-file-list&gt; &lt;welcome-file&gt;index.html&lt;/welcome-file&gt; &lt;welcome-file&gt;index.htm&lt;/welcome-file&gt; &lt;welcome-file&gt;index.jsp&lt;/welcome-file&gt; &lt;/welcome-file-list&gt; &lt;/web-app&gt; </code></pre> <p>project folder structure: <img src="https://i.stack.imgur.com/aOJyN.png" alt="enter image description here"></p>
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    1. COThe WEB-INF/lib folder should not contain `servlet-api`. It's provided by your container and is already in the classpath.
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    2. COError stack trace + `web.xml` should be posted too.
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    3. COThere are no servlet-api in the web-inf lib folder in your screenshot. If you have recently removed it, make sure you do a clean build and clean re-deployment.
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