// update the page size if set in the parameter
if (isParameterBound("pageSize"))
usableObjState.getPagingState().setPageSize(getPageSize());
// get the column model. if not possible, return null.
ITableColumnModel objColumnModel = getTableColumnModel();
if (objColumnModel == null) return null;
Object objSourceValue = getSource();
if (objSourceValue == null) return null;