Newbie: Session variable problem

Could someone please help me solve this session variable problem.
If I use this line of code everything works as desired.
"nextPage.donationDisplayGroup.setCurrentBatchIndex(3);"

When I try the same line replacing the "3" with "sess.dBatch()" it doesn't
work. Gives error "can't resolve symbol"

What is the correct way to right these two lines...?

Session sess = (Session)session(); 
nextPage.donationDisplayGroup.setCurrentBatchIndex(sess.dBatch());

A more complete code sample is shown below. 

Thank You.

------- In Session.java  ---------------

public class Session extends WOSession {

< bunch of code snipped out>

public Integer dBatch ;
public Integer dBatch() {return  dBatch; }
public void setDBatch(Integer newDBatch) { dBatch = newDBatch; }

}



-----Code from a separate web component trying to read variable "dBatch"
from session----

 public SearchDonations doList()
    {
        SearchDonations nextPage =
(SearchDonations)pageWithName("SearchDonations");
		
		nextPage.donationDisplayGroup.qualifyDataSource();
		
		
		/* this next line works --- 
		nextPage.donationDisplayGroup.setCurrentBatchIndex( 3 );
		the correct batch of the displaygroup is shown on the next page
		*/ 

		Session sess = (Session)session(); 
		// this line does not work -- 
		// The code won't compile. Gives error can't resolve symbol
		nextPage.donationDisplayGroup.setCurrentBatchIndex(sess.dBatch());
        return nextPage;
    }

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