Error while copying all rows into an ArrayList...plzzz help

Question

Hi all,
Iam doing a small POC on publishing a Application module as webservices...iam stuck while copying the results of whereclause into an arraylist.. some one please help....below is the code
public class matrixVOImpl extends ViewObjectImpl {
    /**This is the default constructor (do not remove)
    ArrayList al=new ArrayList();
    public matrixVOImpl() {
public  ArrayList getCompLevels(String role){
    int x=0;
    int pos=0;
    setWhereClause("matrixEO.ROLE='"+role+"'");
    executeQuery();
    if (!hasNext())
            throw new JboException("unable to find role " +role);
    long i=getEstimatedRowCount();
    for(x=0;x<=i-1;x++){
    Row rw=getRowAtRangeIndex(x);************ //here lies the problem for me********************
String comp= rw.getAttribute("Competency").toString();
    String lr=rw.getAttribute("LevelRequired").toString();
   al.add(0,comp);
  pos=pos+1;
   al.add(1,lr);
  pos=pos+1;
    return al;
problem is at  Row rw=getRowAtRangeIndex(x); for loop is not workin here...when i manually put zero,first(),last() in place of x works fine i get the first row ..but if i put 1,2...10 or any number i get a null pointer exception..
how to get all the rows ...wch can b copied to an arraylist...can someone help pllzz.Edited by: Oraclerr on Apr 10, 2009 12:31 PM

Answer 1

I think it's because getRowAtRangeIndex depends of what the getRangeSize() value is on the view object before executeQuery is invoked. You can change this value in the properties of the viewobject or programmatically, using setRangeSize. If your range size is one, getRowAtRangeIndex(1) returns null, because the index i zero-based. You should only use range size if you only need to present ex. 10 rows a a time?