Is this the right place to provide feedback on the ADF tutorials/exercises?

Hi there,
I have been trying out the "Access a Web Service from ADF Faces" tutorial and have a few questions or feedback about it. You can access the tutorial at [http://www.oracle.com/technology/obe/obe11jdev/11/wsdc/wsdc.htm|http://www.oracle.com/technology/obe/obe11jdev/11/wsdc/wsdc.htm] . In this tutorial, under the topic Running the Page, step 7, it mentions ignore the error window that appears by clicking OK. This error windows can be found here.
From the message that appears, it seems that on the first load of the page, we are calling the web service with no parameters and therefore produces an error. Why do we still have an error message? I thought we prevented this by performing the somewhat ambiguous (probably because I don't know the adfFacesContext object well enough) steps 1-3 under the same topic ( Running the Page ). Can someone provide some clarity please? I am possibly working on projects where web service controls are essential in the near future.
Thanks in advance.
Cheers,
Cappa

Another way to prevent the execution of the web service that might work better in this scenario is to use a refresh condition that checks that the parameter field is not empty.
This way we only execute the iterator after a value has been placed in the parameter.

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