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Following is my navigation bar for include the logout button for the page.

I want to end the session when a user click the logout button.

I found sample codes by googling and added for my code but following code shows an error.(Check the error in screenshot)

<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav navbar-right"> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Hi, <%=session.getValue("Username") %><b class="caret"></b></a> <ul class="dropdown-menu"> <li align="center" class="well"> <a href="index.jsp" class="btn btn-sm btn-default"><span class="glyphicon glyphicon-log-out"></span> Logout</a> <% session.invalidate(); response.sendRedirect("index.jsp"); %> </li> </ul> </li> </ul> </div><!-- /.navbar-collapse -->

Help me to correct this code..

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2 Answers 2

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1

By default, a session is created for you by container if the session is not available. For JSP use to avoid create new session:

<%@ page session="false" %>

Before accessing the session variables check for the session if available not. Without session, if we call the session object methods it will raise IlleagalStateExcetion.

 <% if (session!=null) {%> <%=session.getValue("Username") %><b class="caret"></b></a> <% } %>

The session is getting invalidated every time the page loads, by not clicking on the Logout. So by clicking on the Logout put a separate page to invalidate the session.

Here I ma using it as logout.jsp, it contains the session invalidation code:

 <!-- For not creating new session --> <%@ page session="false" %> <body> <% // for checking the session is available or not, if not available it will throw exception, "Session already invalidated." if (sesssion!=null) { session.invalidate(); response.sendRedirect("index.jsp"); } %> </body>

And Finally change the Logout link like the following:

<a href="logout.jsp" class="btn btn-sm btn-default"><span class="glyphicon glyphicon-log-out"></span> Logout</a>

Give it a try :)

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1

Problem is your session is already killed before you click the logout link. Also in jsp pages session are auto-created. You need to take care of that while accessing any attribute from the session. Do follow the steps suggested by Srinu.

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