gistfile1.java

import java.util.ArrayList;
import java.util.List;

import javax.jdo.annotations.Extension;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Key;

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Parent2 {
	/** 主キー */
	@PrimaryKey
	@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
	@Extension(vendorName = "datanucleus", key = "gae.encoded-pk", value = "true")
	private String key;

	/** 主キーの{@link Key#getId()}の値 */
	@Persistent
	@Extension(vendorName = "datanucleus", key = "gae.pk-id", value = "true")
	private Long id;

	@Persistent
	private List<Child2> children = new ArrayList<Child2>(0);
}