Creating a ThreadLocal

SessionContextHolder.java

public final class SessionContextHolder {

    private static final SessionContextHolder sessionContextHolder;
  
    static { sessionContextHolder = new SessionContextHolder(); }
  
    public static SessionContextHolder getInstance() { return sessionContextHolder; }

    private final ThreadLocal<Session> sessionContext;

    private SessionContextHolder() {
        super();
        sessionContext = new ThreadLocal<>();
    }
}