in my interceptor, if user doesn't have enough right, there would be a warn message:

    public String intercept(ActionInvocation invocation) throws Exception {

    ActionContext actionContext = invocation.getInvocationContext();
    Map<String, Object> sessionMap = actionContext.getSession();
    User loginUser = (User) sessionMap.get("user");

    Object action = invocation.getAction();

    if (loginUser != null && loginUser.getRole().getId() != Constant.AUTHORITY_ADMIN) {

        ((ValidationAware) action).addFieldError("user.authority",
                ((DefaultAction) action).getText("user.action.authority.not.enough"));

        return DefaultAction.HOME_PAGE;
    }

    return invocation.invoke();
}

then, it would redirect to "HOME_PAGE" action, if success, display information in the jsp. So how to display the warn message?

i have used two interceptors configed in strust.xml, for admin right requirment:

            <interceptor-stack name="authorityStack">
            <interceptor-ref name="authority" />
            <interceptor-ref name="defaultStack" />
            <interceptor-ref name="store">
                <param name="operationMode">STORE</param>
            </interceptor-ref>
        </interceptor-stack>

default is:

<interceptor-stack name="default">
            <interceptor-ref name="login" />
            <interceptor-ref name="defaultStack" />
            <interceptor-ref name="store">
                <param name="operationMode">AUTOMATIC</param>
            </interceptor-ref>
        </interceptor-stack>