Manage bean Request Scope Best Practice

Question

Hi,
I am wondering the following practice which one is better.
I have a listing page and a edit properties page. From the listing page i will click on the record from the data table and click on Edit button to submit the action and navigate to the edit properties page. My BookListingBean and BookPropertyBean have a BookVO variable defined.
public class BookListingBean { BookVO selectedVO; }
public class BookPropertyBean {BookVO bookVO;}
When action submitted, i have a custom navigation handler which eventually will pass the selected row which is an value object, says bookVO to my action method. Then i need to retrieve the book's properties from the database based on the selected bookVO's id and set to book value object for display.
The question is, in BookPropertyBean action method, i can either point the bookVO to the selectedVO directly and use it for display or i wil instantiate a new BookVO and just retrieve the id from the selectedVO and set it to my bookVO.
// selectedVO contains the needed id
public String edit(BookVO selectedVO) {
bookVO = selectedVO;
// invoke API to retrieve the book's properties by passing bookVO
Or
public String edit(BookVO selectedVO) {
bookVO = new BookVO();
bookVO.setId(selectedVO.getId());
// invoke API to retrieve the book's properties by passing bookVO
For me, i would prefer the latter one which is instantiate a new VO as the selectedVO is belongs to previous request and i think i should use new object for the new request but not to own anything from previous request when displaying the edit page.
Am i wrong?

Answer 1

I would use first edit implementation... From description I don' t see reason to duplicate BookVO object... If BookVOs properties is used by API to retrieve and fill page with data for current request without anu modification of BookVOs state there is no need to duplicate... But api changes BookVO and if you need use original member values of BookVO after edit in some other method it's reasonable to use second implementation.
Still I can't exactly be sure in my statements because this is jus a fragment of your application.
Best regards!