> Is there an easy way to do something like cellTable.reload() 
> orcellTable.refresh() ?
when you need refresh data from cellTable simply call
cellTable.setRowData(0, ListValues) where ListValues contains your
changed data

Below code fragment of implementation redraw()
// package com.google.gwt.user.cellview.client
class HasDataPresenter<T> implements HasData<T>, HasKeyProvider<T>,
    HasKeyboardPagingPolicy {
....
  /**
   * Redraw the list with the current data.
   */
  public void redraw() {
    lastContents = null;
    setRowData(pageStart, rowData);
  }
....
}

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