[google-appengine] Unable to create entity on Google App Engine Datastore

[ani]

Hello, I’m trying to connect an android application with Google app
engine. I am using Google App Engine Datastore as my “database”. The
problem is that I am having difficulties in building entities on the
GAE datastore.

I’m using JDO to create my entity and I am following the same code
pattern as on code.google.com
(http://code.google.com/appengine/docs/java/datastore/jdo/
dataclasses.html).

The whole thing runs without error but when I open it on Datastore
viewer at http://localhost:8888/_ah/admin, where I’m suppose to see
all my entities, none of them are being displayed. Instead I’m
receiving the following message:
“Datastore has no entities in the Empty namespace. You need to add
data programmatically before you can use this tool to view and edit
it.”

I even tried to store a simple data object in the datastore for the
entity I created, but it does not work, so I am confusing whether the
entity has been created or not.
(http://code.google.com/appengine/docs/java/datastore/jdo/
creatinggettinganddeletingdata.html)

Below is my Entity Category

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


@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Category{

         @PrimaryKey
         @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
         Long id;
         @Persistent
         private String ccode;
         @Persistent
         private String cname;

         public Category(String ccode, String cname){
                 this.ccode = ccode;
                 this.cname = cname;
         }

         public Long getID() {
                return id;
            }
         public void setID(Long id) {
                this.id = id;
            }
         public String getCcode() {
                return ccode;
            }
         public void setCode(String ccode) {
                this.ccode = ccode;
            }
         public String getCname() {
                return cname;
            }
         public void setCname(String cname) {
                this.cname = cname;
            }

}

Here i"m trying to add an object data in Entity category

Class PMF
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
import javax.jdo.PersistenceManager;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import our.fy.project.Category;

public final class PMF {
    private static final PersistenceManagerFactory pmfInstance =
        JDOHelper.getPersistenceManagerFactory("transactions-
optional");
    private PMF() {}
    public static PersistenceManagerFactory
getPersistenceManagerFactory() {
                return pmfInstance;
    }
    public void addCategory(Category c) {
                PersistenceManager pm =
getPersistenceManagerFactory().getPersistenceManager();
                 c = new Category("abc","xyz");
                Key key =
KeyFactory.createKey(Category.class.getSimpleName(), "011");

        c.setKey(key);

                try {
                        pm.makePersistent(c);
                } finally {
                        pm.close();
                }
        }


Can anyone help, whether I am missing something or not? Thanks.

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