java - Displaying error message in login page after login failure - If condition is not working -


i quite new web development. have login.jsp , filter servlet . in case of unsuccessful login, message has displayed on same page.

login.jsp

<%@ page language="java" contenttype="text/html; charset=iso-8859-1" pageencoding="iso-8859-1"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en"         "http://www.w3.org/tr/html4/loose.dtd"> <html> <head>     <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">     <title>login page</title>     <meta name="viewport" content="width=device-width, initial-scale=1">     <link href="css/home.css" rel="stylesheet">     </head>     <body class="home">        <header class="heading">             <label class="headfont">digital market place</label>       </header>      <form action="./servlet1" method="post">         <div class="form-group">         <div class="login">             <label class="loginmsg">log in seller account</label>         </div>             <div class="input">                 username: <input type="text" name="name" /><br>                 <br>             </div>             <div class="input">                 password: <input type="password" name="password" /><br>                 <br>             </div>              <button type="submit" id="loginbtn">log in</button>              <%             out.println(request.getattribute("loginresult"));                  if(request.getattribute("loginresult") != null && "true".equals(request.getattribute("loginresult"))) {                     out.println("inide if");               %>             <p style="color: red">login failed. please try again.</p>              <%             }          %>         <div class="signup">                 <label class="signmsg">don&#039t have seller account?</label>                 <span style="white-space:nowrap;padding-left: 20px;"><a title="register" href="registration.jsp"> sign now</a></span>             </div>         </div>     </form> </body>

and filter servlet given below:

import java.io.ioexception; import java.io.printwriter; import java.util.properties;  import javax.servlet.*;  public class myfilter implements filter{  filterconfig filterconfig;  public void init(filterconfig arg0) throws servletexception {     setfilterconfig(arg0); }   public void setfilterconfig(filterconfig config) {     this.filterconfig = config; }  public filterconfig getfilterconfig() {     return filterconfig;  }  public void dofilter(servletrequest request, servletresponse response,         filterchain chain) throws ioexception, servletexception {      printwriter out = response.getwriter();       string username = request.getparameter("name");     string password = request.getparameter("password");     properties properties = new properties();     properties.load(getfilterconfig().getservletcontext().getresourceasstream("/conf/user.conf"));     if(username.equals(properties.getproperty("username")) && password.equals(properties.getproperty("password"))){         chain.dofilter(request, response);//sends request next resource     }     else    {         request.setattribute("loginresult", true);          requestdispatcher requestdispatcher = request.getrequestdispatcher("/login.jsp");         requestdispatcher.forward(request, response);     }  } public void destroy() {  }

}

the request.getattribute("loginresult") prints "true" on unsuccesful login. seems control not going inisde if condition.

can 1 please help

i think problem because request.getattribute(string arg) return object type value. , calling equals method compare string object return false.

you need use tostring() method change value string

change code as

 if(request.getattribute("loginresult") != null && "true".equals(request.getattribute("loginresult").tostring())) {                 out.println("inide if");

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