Re: Using the same object at the server and client

Hi,

I am facing same proble in my application.
I am integrating hibernate 3 in my GWT appliaction,
but app cant find my hibernate related classes (Sessionfactory, Configuration) which are there in
my hibernate3.jar.
Give me error "did you forget to inherit a required module"
When i searched a lot i found there is something hibernate4gwt availabe, but i really dont want to go with any
other such frameworks for now.

can anyone have any pointer to resolve query and integrate hibernate with gwt.

cheers,
ketan

On 17 September 2010 17:27, AlexG <alexander.gauss.ax.ag@googlemail.com> wrote:

Ji Jakob,

yes this is a persisted class. The jdo-annotations, tells
datanucleus to persist this in the datastore.

Yea, I´m sorry but you got me right. I ran into this too, when
I started to work with GWT and GAE.
The solution is quite simple, you already said it.
Make a so called: "DataTransferObject" for each persisted class.
This is a Design Pattern .. the DTO-Pattern.

And yes, it is not a good solution.

If you have time, and good Java-knowledge you can code a
Code-Generator, that generates the DataTransferObjects from
each persisted class. It´s a good solution if you have many
classes, that need DTO´s. Here you can just maintain the
perissted class und regenerate the DTO.

I foun d a nice solution, for me:
I store the object (in your case DTO) in the datastore.
So my persistet class looks like this:


@PersitenceCapable
class LetterDataBaseObject

@Persistent
Key key;

@Persistent
String myID;

@Persistent(serialized = true)
Letter myLetter

...


I generate a searchString, so I can still query my object.


For the beginning I would simple use the DTO-Pattern.


Greets Alex


P.S.: what about your import error?

On 17 Sep., 13:40, Janko <janko.sla...@gmail.com> wrote:
> Hi Alex and Thomas.
>
> This is really fast:D
> I guess the Stock.java is persisted:
> ---
> @PersistenceCapable(identityType = IdentityType.APPLICATION)
> public class Stock {
>
>   @PrimaryKey
>   @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
>   private Long id;
>   @Persistent
>   private User user;
>   @Persistent
>   private String symbol;
>   @Persistent
>   private Date createDate;
> ---
>
> Alex if I get you right I cannot use this object on the client side?
> Is there another way I could move the data to client? Creating a
> similar class on the client side is an option, but it is a relatively
> bad option, because I would need to code both classes... Any ideas?
>
> Thank you,
> janko
>
> On Sep 17, 1:30 pm, Janko <janko.sla...@gmail.com> wrote:
>
> > Thank you for the quick response.
>
> > I now get the 13:25:23.531 [ERROR] [homework] Line 9: The import
> > com.google.appengine cannot be resolved
> > Line 9 is: import com.google.appengine.api.users.User;
>
> > I found I need probably inherit it... in what way? what do I need to
> > do?
>
> > On Sep 17, 1:13 pm, Brett Thomas <brettptho...@gmail.com> wrote:
>
> > > I think you need to move the stock class from the .server. package to
> > > .shared. so the client knows about it
>
> > > On Fri, Sep 17, 2010 at 7:09 AM, Janko <janko.sla...@gmail.com> wrote:
> > > > PS: I get the "did you forget to inherit a required module" error..
>
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Thanks and Regards,
Ketan Nale

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