GWT Error: not being able to import com.google.gwt.view.client.ListViewAdapter

I am not being able to import com.google.gwt.view.client.ListViewAdapter开发者_如何学JAVA;. I have GWT 2.1 and it is giving the error The import com.google.gwt.view.client.ListViewAdapter cannot be resolved

ListViewAdapter has been replaced by ListDataProvider in 2.1