Hello,
I have a servlet that traverses a hashtable that
contain user logins mapped to their session objects.
Every hour, I want this servlet to run and clear those
user logins whose session objects have not changed in
the last half hour. I wrote the following code, but I
config.getServletContext is returning a null object.
Have I called the run() method correctly? If not, is
there any other way to call this servlet every hour?
********* CODE BEGINS HERE ************
import java.io.*;
import java.lang.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ClearSessions extends HttpServlet
implements Runnable
{
private ServletContext context;
private boolean upAndRunning;
public void init(ServletConfig config)
throws ServletException
{
context = config.getServletContext();
upAndRunning = false;
}
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws IOException,
ServletException
{
if (!upAndRunning)
{
upAndRunning = true;
(new ClearSessions()).run();
}
}
public void run()
{
Hashtable users = (Hashtable)
context.getAttribute"users");
for (Enumeration e = users.keys();
e.hasMoreElements();)
{
String login = (String)e.nextElement();
HttpSession session = (HttpSession)users.get(login);
Date date = new Date();
long gap = date.getTime() -
session.getLastAccessedTime();
if (gap > (1000*1800)) //Half an hour
{
users.remove(login);
DBA dba = (DBA)session.getValue("dba");
dba.close();
dba = null;
session.invalidate();
}
}
try
{
Thread.sleep(30); // Sleep for one hour
}
catch(InterruptedException ie)
{
}
}
}
********* CODE ENDS HERE ************
The DBA object is a database object that is
instatiated everytime a user logs into the website. I
have written a close() method that closes the
connection object and sets the statement objects to
null.
Thanks and bye,
Arun Jayaprakash.
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