How to access a request scope value in groovy expression of bind variable?

Question

I need to filter the VO query based on the username.Following is what I am doing:
<af:commandButton text="#{translationviewBundle['LoginPage.LOGIN']}"
id="cbLogin" partialSubmit="true"
action="validate">
<af:setPropertyListener to="#{requestScope.userName}"
type="action"
from="#{backingBeanScope.LoginUserBb._username}"/>
</af:commandButton>
In the bind variable(pUserName) I set the value as : adf.context.current.requestScope.get('userName')
and the VO query :
SELECT DISTINCT
LANGUAGES.NAME,
LANGUAGES.ISO_CODE LANGUAGE_CODE
FROM
LANGUAGES LANGUAGES, USER_LANGUAGES USER_LANGUAGES
WHERE LANGUAGES.NAME <> 'English'
AND LANGUAGES.LANGUAGE_CODE = USER_LANGUAGES.LANGUAGE_CODE
AND USER_LANGUAGES.USER_ID = :pUserName
ORDER BY NAME
I get the following error: "Missing IN and OUT parameter at the index 1" and the query returns nothing.
Any suggestions pls?
Thanks,
Swathi Patnam

Answer 1

Your ADF BC layer shouldn't depend on a specific view layer, the best practice in such a case is to have an AM service method exposed to the client and have it accept a parameter.
Something like this:
http://blogs.oracle.com/shay/2010/07/am_service_method_-simpledem.html