#fixed code
                                @Override
    public HttpSession getSession(final boolean create) {
        return servletContext.getSession(exchange.getExchange(), create);
    }
#vulnerable code 
                                @Override
    public HttpSession getSession(final boolean create) {
        if (httpSession == null) {
            Session session = exchange.getExchange().getAttachment(Session.ATTACHMENT_KEY);
            if (session != null) {
                httpSession = new HttpSessionImpl(session, servletContext, servletContext.getDeployment().getApplicationListeners(), exchange.getExchange(), false);
            } else if (create) {
                final SessionManager sessionManager = exchange.getExchange().getAttachment(SessionManager.ATTACHMENT_KEY);
                try {
                    Session newSession = sessionManager.getOrCreateSession(exchange.getExchange()).get();
                    httpSession = new HttpSessionImpl(newSession, servletContext, servletContext.getDeployment().getApplicationListeners(), exchange.getExchange(), true);
                    servletContext.getDeployment().getApplicationListeners().sessionCreated(httpSession);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
        return httpSession;
    } 
                            #location 10 
                            #vulnerability type NULL_DEREFERENCE