FacesRequestAttributes.java 文件源码

public static void removeAttribute(String name, ExternalContext externalContext) {
    Object session = externalContext.getSession(false);
    if (session instanceof PortletSession) {
        ((PortletSession) session).removeAttribute(name, PortletSession.APPLICATION_SCOPE);
    }
    else if (session != null) {
        externalContext.getSessionMap().remove(name);
    }
}