java - How to programatically login to j_security_check -

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i have jsp web application uses j_security_check. possible login specific user j_security_check programatically via jsp page if know userid , password? tried pass variables url parameters way...

response.sendredirect(www.mydomain.com/j_security_check?j_username=someusername&j_password=somepassword )

...but doesnt work. there way it?

edit: here login page works fine right now. trimmed of code security reasons.

    <form name="signon" method="post" action="/j_security_check">       <table width="100%" cellpadding="4" cellspacing="0">          <tr>           <td valign="top" colspan="4">             <h2><%= ui.tr(null, "login_details") %>             </h2>           </td>         </tr>          <tr>           <td valign="top" width="150px">             <%= ui.tr(null, "login_id") %>           </td>           <td valign="top" width="150px">             <%= ui.tr(null, "login_pass") %>           </td>           <td valign="top" width="150px">             <%= ui.tr(null, "login_token_or_captcha") %>           </td>           <td width="100%">&nbsp;</td>         </tr>           <tr>            <%             if (logins == null) {           %>           <td>             <input type="hidden" name="j_uri" value="/index.jsp">             <input type="text" id="username" name="j_username" size="16" style="width: 150px;" autocomplete="off" <%= username == null ? "" : "disabled value='" + username + "'" %> onblur="return checkcaptcha();">           </td>           <%           } else {           %>           <td>             <select name="j_username" style="width: 150px;">               <%                 (login login : logins) {               %>               <option><%= login.getusername() %>               </option>               <%                 }               %>             </select>           </td>           <%             }           %>           <td><input type="password" name="j_password" size="16" style="width: 150px;">                </td>           <td><input type="text" id="mypw" name="mypw" size="16" autocomplete="off" style="width: 150px;"></td>           <td><input class="submit" type="submit" name="submit" value="<%= ui.tr(null, "login_submit") %>"></td>         </tr>     <tr>   <td valign="top" colspan="4">     <%-- <%     if("registry.nic.hn".equals(request.getservername())) {     %>     <!-- garth - put whatever want here .hn -->     &nbsp;     <% } else { %> --%>         <h2><%= ui.tr(null, "login_news") %>         </h2>         <div><%= htmlformat.addbreaks(siteconf.getsiteconf().getnews()) %>         </div>     <%-- <% } %>     --%>   </td> </tr>

the following code works me in jsp file:

string url = "j_security_check?j_username=" + username + "&j_password=" + password; string redirecturl = response.encoderedirecturl(url); response.sendredirect(redirecturl);

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