I have the following class objects in Google App Engine's dadastore, I can see them from the "Datastore Viewer " :

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;

@PersistenceCapable(identityType=IdentityType.APPLICATION)
public class Contact_Info_Entry implements Serializable
{
  @PrimaryKey
  @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
  Long Id;
  public static final long serialVersionUID=26362862L;
  String Contact_Id="",First_Name="",Last_Name="",Company_Name="",Branch_Name="",Address_1="",Address_2="",City="",State="",Zip="",Country="";
  double D_1,D_2;
  boolean B_1,B_2;
  Vector<String> A_Vector=new Vector<String>();

  public Contact_Info_Entry() { }
......
}

How can my java applications get the object from a servlet url ? For instance if have an instance of Contact_Info_Entry who's Contact_Id is "ABC-123", and my App Id is : nm-java

When my java program accesses the url :

 "http://nm-java.appspot.com/Check_Contact_Info?Contact_Id=ABC-123

How will the Check_Contact_Info servlet get the object from datastore and return it to my app ?

public class Check_Contact_Info_Servlet extends HttpServlet
{
  static boolean Debug=true;

  public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException
  {

  }
...
  protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { doGet(request,response); }
}

Frank