Please suggest me some solution immediately,

```
public class SessionTImeOutFilter implements Filter {
    String check = "";

```

The about check is my field variable. When I deploy the application in tomcat and if multiple users are accessing the application, The variable **check** is getting shared by all the sessions of users.

Kindly, Suggest me some way to keep the variable **check** not shared among all sessions. 

Thanks in advance.