Yes I have...those lines in my project......
*Program 1:*
package datastore;
import java.io.IOException;
import java.util.Date;
import java.util.logging.Logger;
import javax.jdo.PersistenceManager;
import javax.servlet.http.*;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
@SuppressWarnings("serial")
public class DataStoreServlet extends HttpServlet {
@SuppressWarnings("unused")
private static final Logger log =
Logger.getLogger(DataStoreServlet.class.getName());
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
String content = req.getParameter("content");
Date date = new Date();
Greeting greeting = new Greeting(user, content, date);
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
pm.makePersistent(greeting);
} finally {
pm.close();
}
//resp.sendRedirect("/guestbook.jsp");
}
}
*Program 2:*
package datastore;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.users.User;
import java.util.Date;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
public class Greeting {
*@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;*
@Persistent
private User author;
@Persistent
private String content;
@Persistent
private Date date;
public Greeting(User author, String content, Date date) {
this.author = author;
this.content = content;
this.date = date;
}
public Key getKey() {
return key;
}
public User getAuthor() {
return author;
}
public String getContent() {
return content;
}
public Date getDate() {
return date;
}
public void setAuthor(User author) {
this.author = author;
}
public void setContent(String content) {
this.content = content;
}
public void setDate(Date date) {
this.date = date;
}
}
*Program 3:*
package datastore;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
public final class PMF {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory("transactions-optional");
private PMF() {}
public static PersistenceManagerFactory get() {
return pmfInstance;
}
}
What is the problem in my Program...........Please help me....
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