Invalidate particular user session

General
1
  1. My system has 2 logging users A & B. I log system using A user, now I want to logout user B when I click button how can I do it

I did it below way

private ApplicationContext ctx;
private WebApplicationContext webctx;

ctx = getMainForm().getContext();
webctx = (WebApplicationContext) ctx;

 try {
        webctx.getHttpSession().getSessionContext().getSession("007").invalidate();
    } catch (Exception e) {
        System.out.println(e);
    }

need to inavalidate user 007 but that gave “java.lang.NullPointerException”

above code “getSessionContext()”, “getSession(”“)” Deprecated how can i solve this problem.

  1. How to invalidate system all logging users ?
2

I found answer for that problem Please correct if I wrong

1st I put userId & session into map

sessionMap.put(userId, session);

after that I remove users using button click


   try {
        if (MainForm.sessionMap.containsKey(arUsers[i]
) == true) {
                MainForm.sessionMap.get(arUsers[i]
).invalidate();
                MainForm.sessionMap.remove(arUsers[i]
);
         }
     } catch (Exception e) {
          System.out.println(e);
      }
3

Looks like that ought to work, but make sure you’re careful about concurrency when dealing with that map. You could use a thread-safe map implementation, but since your method is a check-then-act sequence you’re better off using any map implementation and just don’t expose it to any other code. In your code, you should synchronize the put and invalidate/remove methods using the same lock.

Cheers,
Bobby