this means that Weld detected an unremoved ThreadLocal variable (holding request scoped bean instances) during request context association. This may happen if Weld does not recieve
ServletRequestListener.requestDestroyed(ServletRequestEvent)notification. We've observed similar issues with applications using server push (e.g. Atmosphere) on some servlet containers. Since 1.1.24.Final and 2.2.4.Final Weld always associates a new bean store for each request (replacing the old one if present). So I wouldn't say it's entirely safe to ignore but it should not pose any security threats or cause memory leaks.