I am developing project using maven after giving correct name of servlet in servlet mapping, still not working giving classnotfound exception?

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**This is loginpage.jsp file in which i am assigning servlet and method.**

    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
            pageEncoding="ISO-8859-1"%>
        <!DOCTYPE html>
        <html>
        <head>
        <meta charset="ISO-8859-1">
        <title>Login Page</title>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
        <link href="css/mystyle.css" rel="stylesheet" type="text/css"/>
        
        </head>
        <body>
        
        <%@ include file="navbar.jsp" %>
        <main class="d-flex align-items-center primary-background" style=height:70vh>
        <div class="container">
        <div class="row">
        <div class="col=md-4 offset-md-4">
        
        
        <div class="card text-dark">
        <div class="card-header primary-background text-white text-center">
        
        <p>Login page</p>
        </div>
        <br>
        <div class="card-body">
        <form action="LoginServlet" method="post">
          <div class="form-group">
            <label for="exampleInputEmail1">Email address</label>
            <input name="email" type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
            <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
          </div>
          <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input name="password" type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
          </div>
          
          </div>
          <button type="submit" class="btn btn-primary">Submit</button>
          </form>
        </div>
        
        
        
        
        
        </div>
        
        </div>
        
        
        </div>
        
        
        
        
        </div>
        
        
        
        </main>
        
        
        
        <!-- Javascript- -->
        <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
        <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
        <script src="js/myjs.js" type="text/javascript"></script>
        
        
        </body>
        </html>

```This is web.xml deployment descriptor in which servlet mapping takes place.```    


    <!DOCTYPE web-app PUBLIC
         "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
         "http://java.sun.com/dtd/web-app_2_3.dtd" >
        
        <web-app>
          <display-name>Archetype Created Web Application</display-name>
          <servlet>
          	<servlet-name>RegisterServlet</servlet-name>
          	<display-name>RegisterServlet</display-name>
        
          	<servlet-class>com.techblog.servlets.RegisterServlet</servlet-class>
          </servlet>
          <servlet>
          	<servlet-name>LoginServlet</servlet-name>
          	<display-name>LoginServlet</display-name>
          	<description></description>
          	<servlet-class>com.techblog.servlets.LoginServlet</servlet-class>
          </servlet>
          <servlet-mapping>
          	<servlet-name>RegisterServlet</servlet-name>
          	<url-pattern>/RegisterServlet</url-pattern>
          </servlet-mapping>
          <servlet-mapping>
          	<servlet-name>LoginServlet</servlet-name>
          	<url-pattern>/LoginServlet</url-pattern>
          </servlet-mapping>
        </web-app>

>*This is LoginServlet.java file in which coding part takes place.*

    package com.techblog.servlets;
    
    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;
    import javax.servlet.http.HttpSession;
    
    import com.techblog.dao.Userdao;
    import com.techblog.entities.User;
    import com.techblog.helper.Connectionprovider;
    
    /**
     * Servlet implementation class LoginServlet
     */
    public class LoginServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
       protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		String email=request.getParameter("email");
    		String password=request.getParameter("password");
    		Userdao usd=new Userdao(Connectionprovider.getconnection());
    		User u=usd.getbyEmailandpassword(email, password);
    		if(u==null) {
    			
    			PrintWriter out =response.getWriter();
    		    out.println("Invalid inputs");
    		}
    		else
    		{
    			HttpSession s= request.getSession();
                s.setAttribute("currentuser", u);
                response.sendRedirect("profile.jsp");
    		}
    	}
    
    }

**It is giving an error exception i.e.SEVERE: Allocate exception for servlet [LoginServlet]
java.lang.ClassNotFoundException: com.techblog.servlets.LoginServlet**

Java

What I have tried:

Since I am developing project using maven in Eclipse I ran the project using maven clean.After doing it still it not working.

**It is giving an error exception i.e.SEVERE: Allocate exception for servlet [LoginServlet]
java.lang.ClassNotFoundException: com.techblog.servlets.LoginServlet**

Posted 22-Oct-21 11:56am

HIMANSHU SRIVASTAVA Oct2021

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