<action name="TestAction" class = "com.test.action.QuerySomeData">
            <interceptor-ref name="basicStack" />
            <interceptor-ref name="execAndWait">
                    <param name="delay">2000</param>
                    <param name="delaySleepInterval">3000</param>
            </interceptor-ref>

                <result name="wait" type="tiles">waiting</result>
                <result name="success" type="tiles">mainPage</result>
                <result name="exception" type="tiles">errPage</result>
    </action>

at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
at org.apache.struts2.interceptor.BackgroundProcess$1.run(BackgroundProcess.java:57)
at java.lang.Thread.run(Unknown Source)