public class FirstInterceptor extends AbstractInterceptor{

    @Override

    public String intercept(ActionInvocation actionInvocation) throws Exception {

        String result = actionInvocation.invoke();

        return result;

    }

}

        <interceptors>

            <interceptor name="firstInter" class="com.wolfgang.interceptor.FirstInterceptor"></interceptor>

        </interceptors>

        <action name="testOGNL" class="com.wolfgang.action.TestOGNL">

            <interceptor-ref name="firstInter"></interceptor-ref>

            <result>/OGNL/static.jsp</result>

        </action>