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package guestbook;import java.util.Date;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.users.User;@PersistenceCapable(identityType=IdentityType.APPLICATION)public class Greeting {@PrimaryKey@Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)private Long id;@Persistentprivate User author;@Persistentprivate String content;@Persistentprivate Date date;public Greeting( User author, String content, Date date) {this.author = author;this.content = content;this.date = date;}public User getAuthor() {return author;}public String getContent() {return content;}public Date getDate() {return date;}public Long getId() {return id;}public void setAuthor(User author) {this.author = author;}public void setContent(String content) {this.content = content;}public void setDate(Date date) {this.date = date;}public void setId(Long id) {this.id = id;}}