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User, please tell us your jdev version!
First question: I don't see one or don't understand your use case. Please bear in mind, that we don't know Forms stuff here. Check out https://blogs.oracle.com/grantronald/entry/migrating_forms_to_java_or
Second question: it depends on the use case
thanks Timo for your replay
I use Jdeveloper version (18.104.22.168)
First Question :- i have a view object of ( Countries ) in Hr Schema and include the name of the region ( RegionName ) Attribute From the ( Regions) View Object
to be appeared in the Countries View Object using groovy expression and accessors View link
when i insert a new record in the Coutries View Object it gives me an error
*(oracle.jbo.JboException) JBO-29000: Unexpected exception caught: java.lang.NullPointerException, msg=null*
Your use case more sounds like a you should use a model driven list of value. If you use groovy you can't enter a value in the attribute.
Check this sample http://www.baigzeeshan.com/2010/03/creating-lov-in-adf-application.html.
thanks Timo for replay
i know that when i use groovy i can't enter a value in the attribute .
how to prevent the error message that appeared when insert new record ?
Have you read the link I provided in my last post?
Use a model driven LOV which does all the nifty stuff for you (showing a name but storing the PK).
I got what you mean .
I use list of values to solve the problem .