In this website i need a system that logs the user out after 10 minutes. In
order to login i use a simple procedure of inserting a user "in my case
called Lid" instance, and the logout invalidates the session, additionally,
when the user logs in a timertask within a timer starts, and after 10
minutes invalidates the session. here the code:
MyTask task=null;
private void setCurrent(String key, Object o){
getRequest().getSession().setAttribute(key,o);
}
private <T> T getCurrent(String key){
T value=(T)getRequest().getSession().getAttribute(key);
return value;
}
public void logIn(Lid lid){
setCurrent("lid", lid);
Timer timer=new Timer();
task=new MyTask(getRequest().getSession());
System.out.println(task.toString());
timer.schedule(task,10*60*1000);
}
public void logOut(){
task.cancel();
getRequest().getSession().invalidate();
}
This is the MyTask code:
public class MyTask extends TimerTask{
HttpSession session=null;
public MyTask(HttpSession session){
this.session=session;
}
@Override
public void run() {
session.invalidate();
}
The problem is that when i voluntarily log out, it throws an exception
because it says that the task variable is null, and so it becomes not
possible to call cancel() on the task variable. But i dont get it, after
logging in the variable is instantiated, its not null.
Do you have some advise about this? Thank you
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