Essentially that's about it. Although you probably want to put them into a different package. The default Eclipse GWT Project contains a 'shared' package that is for this purpose. Its also by default in your [project].gwt.xml file with the tag <source path="shared">.
Adding those source tags to your gwt.xml file tells GWT that those classes need to be available client side. Hence why you wont find the 'server' package in that file, as it's server side code only. By accessing a class in shared from the server side code, it will get compiled and be available for you. The rest is all done for you when GWT creates the MyServiceAsync class which you define the interface for, and within the RemoteServiceServlet which your Servlet extends. I think it would be a worthwhile experiment to see if and how much of a difference there is between using GWT-RPC and using JSON with Overlay Types. Just to throw another option into the mix you could roll your own RPC interface using GWT Generators like GWT does. While we're on the subject of GWT-RPC, are you locked into using a Servlet on the server side? Is there some binary format that GWT converts to for serialization, or is it simply producing a JSON string and decoding it in RemoteServiceServlet. 2010/6/19 Jose Luis Estrella Campaña <[email protected]>: > Wow, It's amazing to see this forum has so much activity. I feel so > welcome in here, too bad I can't see my question on the main > discussions page. :( > > Ok, based on your replies, I've now analyzed all the options you've > given me, and sincerely I now honestly gotta say that it was my own > lack of GWT knowledge which led me to believe I had to do something > more complex than necessary. I think > if I stick with Chris' suggestion I'll be just fine. Now, I still have > one more fundamental question: > > If I use my own classes (POJOs), say like a Person POJO and I create > it on the .client package of my gwt application. Is that ALL I gotta > do in order to work with it between the client and the server ? I mean > sending it from the client to the RemoteServiceService Impl. > > If that's not all that I should do to work with my personal classes, > could you please tell me what else is required ? I'm still confused > with the <inherits> thing. or wheter a personal class should be > defined on the client as well as in the server side. I just would like > to know. > > Best Regards, and thanks everyone for the kind replies !. > > Jose. > > On Jun 19, 10:09 am, "Dean S. Jones" <[email protected]> wrote: >> This is not totally true, gwt-rpc is OK for most data transfers, but >> it causes a bit of overhead in deserialization. GWT's client side JSON >> library is SLOW, >> it constructs a parallel data structure of concrete types on parse, >> upfront, and by default uses eval('''), which isn't always the best or >> fastest way to go. >> >> Since your asking the JSON data-structure "isArray()", etc, most of >> the time, I find lazy evaluation to be much faster. Also, you can >> tweak your custom deserializer to use the JSON >> native parser if it is available. >> >> On Jun 18, 2:14 pm, Gal Dolber <[email protected]> wrote: >> >> >> >> > Sure, there is no doubt that the best way to go its the gwt-rpc >> >> > 2010/6/18 Chris Boertien <[email protected]> >> >> > > All good points, but I think you guys are totally missing the point. >> > > He was taking a POJO and converting it to JSON for transmission using >> > > GWT-RPC, which is completely redundant since GWT-RPC can simply send >> > > the POJO and handle all the messy bits for him. >> >> > > Simple is better... >> >> > > On Fri, Jun 18, 2010 at 9:26 AM, Gal Dolber <[email protected]> wrote: >> > > > I think the best you can do is a generator that creates an overlay for >> > > that >> > > > pojo and a utility class to convert a json string to the pojo. >> > > > The interface will look like this: >> > > > public interface Json2Pojo<POJO> { >> > > > POJO fromJson(String json); >> > > > } >> > > > And the steps will be: >> >> > > > Create an POJOOverlay from the json string >> > > > Instantiate a POJO >> > > > Call all POJO setters with POJOOverlay getter >> > > > Return the POJO >> >> > > > And the gwt compiler will inline that for you. >> > > > Best >> > > > 2010/6/18 Peter Simun <[email protected]> >> >> > > >> Hi Jose, >> >> > > >> Piriti project looks great for your needs. If you would like to >> > > >> customize deserialization process (with custom instantiators and >> > > >> deserializers) you can also use acris-json project. You can find >> > > >> details here: >> > > >>http://code.google.com/p/acris/wiki/GWTJsonizer >> >> > > >> (Project is based on JSONParser from GWT which internally use eval >> > > >> function) >> >> > > >> Only with using annotations you can get powerfull piece of >> > > >> functionality in JSON parsing mechanism. For example this project was >> > > >> used for deserialize JSON reponses from Google Youtube API in gwt- >> > > >> youtube-api.googlecode.com project. >> >> > > >> Peter >> >> > > >> On 18. Jún, 16:14 h., Harald Pehl <[email protected]> wrote: >> > > >> > Hi Jose, >> >> > > >> > you could take a look at Piriti:http://code.google.com/p/piriti/. >> > > >> > It's an XML / JSON mapper for GWT which maps JSON data from the >> > > >> > server >> > > >> > to POJO on the client. >> >> > > >> > - Harald >> >> > > >> > P.S. At the moment Piriti uses the "eval" function to parse JSON. >> > > >> > This >> > > >> > will be changed in the next release, so that the internal JSON >> > > >> > parser >> > > >> > is used. >> >> > > >> > On 18 Jun., 15:34, Chris Boertien <[email protected]> wrote: >> >> > > >> > > Shouldn't have a problem sending a HashMap back and forth. As far >> > > >> > > as >> > > i >> > > >> > > can tell GWT has a fairly complete implementation of the Java >> > > >> > > Collections API, and all of which are Serializable, so there >> > > shouldn't >> > > >> > > be any issues. I haven't used it for much more than Lists so there >> > > >> > > might be quirks I haven't come across yet. >> >> > > >> > > 2010/6/18 Jose Luis Estrella Campaña <[email protected]>: >> >> > > >> > > > Hello There ! >> >> > > >> > > > I believe what Chris says is totally right, I should just use a >> > > >> > > > regular Java Object, I was mistaken when I thought I had to do >> > > JSON >> > > >> > > > parsing on the server side. >> > > >> > > > Now, I would like to know if a HashMap containing Strings only >> > > >> > > > is >> > > >> > > > serializable ? Could I send it from the client to the Server and >> > > >> > > > Back >> > > >> > > > (specially back)? >> >> > > >> > > > Thank you very much in advance ! >> >> > > >> > > > Jose. >> >> > > >> > > > On Jun 17, 10:59 pm, Jan Ehrhardt <[email protected]> >> > > >> > > > wrote: >> > > >> > > >> The GWT docs are offering you to use the JavaScript "eval" >> > > function >> > > >> > > >> directly >> > > >> > > >> or through the JSONParser class, which internally uses the >> > > >> > > >> "eval" >> > > >> > > >> function. >> > > >> > > >> A more secure way, that is to use the JSON >> > > >> > > >> libraryhttp://www.json.org/js.html. You'll place the additional >> > > JavaScript >> > > >> > > >> library >> > > >> > > >> in your host page, as any other JavaScript too. Than take the >> > > code >> > > >> > > >> from the >> > > >> > > >> GWT docs: >> >> > > >> > > >> private final native JsArray<StockData> >> > > >> > > >> asArrayOfStockData(String >> > > >> > > >> json) /*-{ >> > > >> > > >> return *eval(json);* >> >> > > >> > > >> }-*/; >> >> > > >> > > >> and modify it like this: >> >> > > >> > > >> private final native JsArray<StockData> >> > > >> > > >> asArrayOfStockData(String >> > > >> > > >> json) /*-{ >> > > >> > > >> return *$wnd.JSON.parse(json);* >> >> > > >> > > >> }-*/; >> >> > > >> > > >> This is more secure than using the "eval" function. >> > > >> > > >> Additionally >> > > >> > > >> the >> > > >> > > >> "JSON.parse()" function has become part of the JavaScript >> > > standard >> > > >> > > >> and is >> > > >> > > >> implemented natively in many modern browsers. The above library >> > > >> > > >> knows this >> > > >> > > >> and delegates the secure JSON parsing to the fast native parser >> > > >> > > >> provided by >> > > >> > > >> the browser. >> >> > > >> > > >> Regards >> > > >> > > >> Jan Ehrhardt >> >> > > >> > > >> 2010/6/18 Chris Boertien <[email protected]> >> >> > > >> > > >> > Is there a particular reason that you _need_ the JSON string? >> > > If >> > > >> > > >> > your >> > > >> > > >> > using GWT RPC then you can simply send a Java Object to the >> > > >> > > >> > server and >> > > >> > > >> > the underlying GWT will handle the serialization for you. >> >> > > >> > > >> > If you the JSON string is coming from somewhere else and you >> > > >> > > >> > really >> > > >> > > >> > have no choice, then it may be worthwhile to put together a >> > > >> > > >> > JSO >> > > >> > > >> > Overlay, use the Overlay to instantiate a POJO on the client >> > > side >> > > >> > > >> > code, and send the POJO to the server via GWT RPC. >> >> > > >> > > >> > Since your new some of that probably makes no sense, and If >> > > >> > > >> > you >> > > >> > > >> > can >> > > >> > > >> > give a little more detail as to why you need to have JSON >> > > >> > > >> > originating >> > > >> > > >> > from the client I'm sure this can be explained a bit better >> > > >> > > >> > to >> > > >> > > >> > fit >> > > >> > > >> > your case. >> >> > > >> > > >> > GWT-RPC: >> > >http://code.google.com/webtoolkit/doc/latest/tutorial/RPC.html >> > > >> > > >> > GWT-JSON: >> >> > >http://code.google.com/webtoolkit/doc/latest/tutorial/JSON.html#client >> >> > > >> > > >> > 2010/6/16 Jose Luis Estrella Campaña <[email protected]>: >> > > >> > > >> > > Hello Folks ! >> >> > > >> > > >> > > I'm glad to say that I'm a brand new user of GWT, a very >> > > happy >> > > >> > > >> > > one by >> > > >> > > >> > > the way. However, as any newcomer I have questions, One in >> > > >> > > >> > > particular. >> > > >> > > >> > > Here it goes: >> >> > > >> > > >> > > What's the easiest, most straight forward way to >> > > >> > > >> > > deserialize >> > > a >> > > >> > > >> > > JSON >> > > >> > > >> > > String on the Server side and instance a Java Object from >> > > >> > > >> > > it >> > > ? >> >> > > >> > > >> > > The JSON String will be sent from the client side, an >> > > >> > > >> > > implementation >> > > >> > > >> > > of the RemoteService for example, and I intend to >> > > >> > > >> > > deserialize >> > > >> > > >> > > it on >> > > >> > > >> > > the Server side, say inside the RemoteServiceServlet >> > > >> > > >> > > Implementation, >> > > >> > > >> > > so I can instance a Java Object with the information >> > > contained >> > > >> > > >> > > in the >> > > >> > > >> > > JSON string afterwards. Is there a way this last step >> > > >> > > >> > > automatically >> > > >> > > >> > > with some GWT API ? >> >> > > >> > > >> > > I would like to see some examples if it's possible. >> >> > > >> > > >> > > Best Regards, >> >> > > >> > > >> > > Sincerely, >> >> > > >> > > >> > > Jose. >> >> > > >> > > >> > > -- >> > > >> > > >> > > You received this message because you are subscribed to the >> > > >> > > >> > > Google Groups >> > > >> > > >> > "Google Web Toolkit" group. >> > > >> > > >> > > To post to this group, send email to >> > > >> > > >> > > [email protected] >> > > >> > > >> > . >> > > >> > > >> > > To unsubscribe from this group, send email to >> >> > > >> > > >> > [email protected]<google-web-toolkit%2Bunsubs >> > > >> > > >> > [email protected]> >> > > <google-web-toolkit%2Bunsubs >> > > >> > > >> > [email protected]> >> > > >> > > >> > . >> > > >> > > >> > > For more options, visit this group at >> > > >> > > >> >http://groups.google.com/group/google-web-toolkit?hl=en. >> >> > > >> > > >> > -- >> > > >> > > >> > You received this message because you are subscribed to the >> > > >> > > >> > Google Groups >> > > >> > > >> > "Google Web Toolkit" group. >> > > >> > > >> > To post to this group, send email to >> > > >> > > >> > [email protected]. >> > > >> > > >> > To unsubscribe from this group, send email to >> >> > > >> > > >> > [email protected]<google-web-toolkit%2Bunsubs >> > > >> > > >> > [email protected]> >> > > <google-web-toolkit%2Bunsubs >> > > >> > > >> > [email protected]> >> > > >> > > >> > . >> > > >> > > >> > For more options, visit this group at >> > > >> > > >> >http://groups.google.com/group/google-web-toolkit?hl=en. >> >> > > >> > > > -- >> > > >> > > > You received this message because you are subscribed to the >> > > >> > > > Google >> > > >> > > > Groups "Google Web Toolkit" group. >> > > >> > > > To post to this group, send email to >> > > >> > > > [email protected]. >> > > >> > > > To unsubscribe from this group, send email to >> > > >> > > > [email protected]<google-web-toolkit%2Bunsubs >> > > >> > > > [email protected]> >> > > . >> > > >> > > > For more options, visit this group >> >> ... >> >> read more » > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-web-toolkit?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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