Often, it is necessary to retrieve all items in an extent for processing of some sort. The Extent interface provides a mechanism for retrieving an Iterator that can be used to traverse the entire extent, but it does not provide a method for retrieving a collection of all the items in the extent.

Kodo JDO's Extent implementation provides a method that can be used to access the data in an extent via the List interface. See the com.solarmetric.kodo.runtime.ExtentImpl Javadoc for details.