Oracle MSCA -Data is not populating in List of Values in Extended Page Class

Hi,
I am new to Oracle MSCA and I am facing an issue while extending Standard Java Class.
The list of values in the page is not populating and Submit Button is also not working.

I have a requirement to customize MO Allocation Page in Oracle MSCA,As I have read from various blogs ,we need to extend the standard Java Class and do the customisation.
And in my case the menu name attached to Pick Confirm Page is Mobile Move Order Pick. And the Mo Allocation Page' s basically the DetailPage.We need to go to the Detail page from Pick Confirm screen(QueryPickWave Function) by entering either sales order number or move order number. And in the submit button of the page they are calling to navigate to DetailPage.