Correction - This line public void load(AsyncCallback<ArrayList<SomeType>>)
Is meant to be public void load(AsyncCallback<ArrayList<SomeType>> callback) Thanks On Dec 24, 11:23 am, Suri <sviswanad...@gmail.com> wrote: > Hey all, > I was looking for a solution to theexceptionhandlingdescribed above > and tried the technique suggested. However, when I implement theexceptionin > the onFailure method as shown, eclipse barfs and shows a > "unhandledexceptiontype throwable" error at me. Same thing happens > when I try to compile anyway. > > - I'm using GWT 1.5 and tried extending theexceptionwith bothExceptionas well > as SerializationException > - Also, I'm implementing a fascade pattern as described in the GWT in > Action Book for the RPC calls. > > Here's a scenario of what I'm trying > > public class MyRPCException extendsException > { > // same definition ofexceptionas above really. > > } > > public interface MyRPCService > { > ArrayList<SomeType> load() throws MyRPCException; > > } > > public interface MyRPCServiceAsync > { > void load(AsyncCallback<ArrayList<SomeType>>); > > } > > public class MyRPCFascade > { > private MyRPCFascade() // singleton is used just didn't > bother inserting code here because i think its irrelevant to the > issue. > { > proxy = (MyRPCServiceAsync) GWT.create(MyRPCService.class); > ServiceDefTarget endPoint = (ServiceDefTarget) proxy; > endPoint.setServiceEntryPoint("/myRPCService"); > } > > public void load(AsyncCallback<ArrayList<SomeType>>) > { > proxy.load(callback); > } > > } > > --- Server side ---- > public class MyRPCServiceImpl implements MyRPCService > { > public ArrayList<SomeType> load() throws MyRPCExecption > { > try {.....} > catch(SomeException e) { throw new MyRPCException(); } > } > > } > > ----- Client Side ---- > myRPCFascade.load(new SomeTypeCallback() ) > > class SomeTypeCallback implements AysncCallback<ArrayList<SomeType>> > { > public void onSuccess(ArrayList<SomeType> result) > { > // .... process result > } > > public void onFailure(Throwable caught) > { > try > { > throw caught; // **** This is where > compilation Fails > } > catch(MyRPCException e) > { > Window.alert("DING"); > } > } > > } > > Any ideas what I'm doing wrong? > > Thanks > > Suri > > On Nov 26, 11:08 pm, satya <satya.mu...@gmail.com> wrote: > > > There is a SerializationException > > > (public class SerializationException > > extends java.lang.Exception) in gwt1.5. > > > SerializableException is depricated in 1.5 > > > I shall try your suggestion of extending theExceptionor use the > > SerilizationException and post the code here. > > > Thank you both for your help, > > Appreciate it > > Satya > > > On Nov 26, 12:54 pm, jossey <joss...@gmail.com> wrote: > > > > I am sorry... my bad... I read it as SerializationException.... > > > Looked at the SerializableException in gwt... it is just anException > > > implementing IsSerializable interface... so it all makes sense. > > > Thanks Ravi for clarifying. > > > > BTW, in 1.5 gwt supports serialization of objects implementing > > > java.io.Serializable. > > > So just by extendingExceptionit would work. > > > > Thanks again, > > > Jossey. > > > > On Nov 26, 8:56 am, Ravi M <mund...@gmail.com> wrote: > > > > > Jossey > > > > > Quite the contrary, actually. I started off with a customexception > > > > which was merely a child class ofExceptionthat I intended to use in > > > > RPC calls (i.e. service methods throw it). This actually didn't work > > > > in the ways expected, i.e. when the server threw theexceptionI was > > > > unable to retrieve theexceptionmessage in the client, or find out > > > > what the cause was. Which is when some digging around revealed that if > > > > you want to send theexceptionover the wire, it has to be a GWT > > > > SerializableException. > > > > > This is with 1.4.6x, of course this may have changed in 1.5.x, I am > > > > not sure. > > > > > Ravi > > > > > On Nov 26, 5:58 pm, jossey <joss...@gmail.com> wrote: > > > > > > Hi, > > > > > Why are we extending SerializableException? > > > > > Is that because the starting example had it so? > > > > > I think it kinds of gives out a wrong message. ... > > > > > just extendsExceptionshould do. > > > > > > not very relevant to the discussion.... anyways... > > > > > > Jossey. > > > > > > On Nov 25, 3:33 pm, Ravi M <mund...@gmail.com> wrote: > > > > > > > Ah me. Step 1 should read: > > > > > > > 1. Declare your RPCexceptionlike so: > > > > > > > public class MyRPCException extends SerializableException { > > > > > > public MyRPCException() { > > > > > > super(); > > > > > > } > > > > > > > public MyRPCException(String message) { > > > > > > super(message); > > > > > > } > > > > > > > //... other stuff? > > > > > > > } > > > > > > > On Nov 26, 1:32 am, Ravi M <mund...@gmail.com> wrote: > > > > > > > > Satya, > > > > > > > > The following should work. > > > > > > > > 1. Declare your RPCexceptionlike so: > > > > > > > > public class MyRPCException extends SerializableException { > > > > > > > public TrackerRPCException() { > > > > > > > super(); > > > > > > > } > > > > > > > > public MyRPCException(String message) { > > > > > > > super(message); > > > > > > > } > > > > > > > > //... other stuff? > > > > > > > > } > > > > > > > > 2. Declare your service method like so: > > > > > > > > public SomeReturnedObject myServiceMethod(...arguments...) throws > > > > > > > MyRPCException; > > > > > > > > 3. Declare your async service method like so: > > > > > > > > public void myServiceMethod(...arguments..., AsyncCallback > > > > > > > callback); > > > > > > > > 4. The server side implementation of your service method may be > > > > > > > like > > > > > > > so: > > > > > > > > public SomeReturnedObject myServiceMethod(...arguments...) > > > > > > > throws > > > > > > > MyRPCException { > > > > > > > SomeReturnedObject ret = null; > > > > > > > try { > > > > > > > // Do stuff to "populate" ret. This stuff could > > > > > > > potentially fail. > > > > > > > } catch (SomeNonGWTSerializableServerSideException e) { > > > > > > > throw new MyRPCException("This is an error message > > > > > > > that > > > > > > > may be appropriate to show in the UI: " + e.getMessage()); > > > > > > > } > > > > > > > return ret; > > > > > > > } > > > > > > > > 5. In your AsyncCallback in the client: > > > > > > > > public void onSuccess(Object result) { > > > > > > > SomeReturnedObject foo = (SomeReturnedObject) > > > > > > > result; > > > > > > > // Happiness and tranquility reign supreme > > > > > > > }; > > > > > > > > public void onFailure(Throwableexception) { > > > > > > > try { > > > > > > > throwexception; > > > > > > > } catch (MyRPCException e) { > > > > > > > // Show the error message to the user, > > > > > > > // or handle however you want to. > > > > > > > } > > > > > > > }; > > > > > > > > This should work, there may be some overkill in this though. All > > > > > > > this > > > > > > > is GWT 1.4.6x, I'm not sure if any of this has changed in 1.5.x. > > > > > > > > Hope this helps > > > > > > > > Ravi > > > > > > > > On Nov 26, 1:08 am, satya <satya.mu...@gmail.com> wrote: > > > > > > > > > Thank you very much, > > > > > > > > I guess i can return the String "IllegalDateRangeException" when > > > > > > > > throwing thatexceptionfrom my Service and check for that in my > > > > > > > > onFailure class. > > > > > > > > > public void onFailure( Throwable caught ) > > > > > > > > { > > > > > > > > if ( caught.getMessage().contains > > > > > > > > ( "IllegalDateRangeException" ) ) > > > > > > > > > //handle my class. > > > > > > > > } > > > > > > > > > Thnak you, > > > > > > > > Satya > > > > > > > > > On Nov 25, 1:38 pm, "olivier nouguier" > > > > > > > > <olivier.nougu...@gmail.com> > > > > > > > > wrote: > > > > > > > > > > On Tue, Nov 25, 2008 at 8:14 PM, satya > > > > > > > > > <satya.mu...@gmail.com> wrote: > > > > > > > > > > > Also > > > > > > > > > > > when i call the actual method, does theexceptionget caught > > > > > > > > > > in the > > > > > > > > > > failure method or in my catch method? > > > > > > > > > > > For example: > > > > > > > > > > > AsyncCallback callBack = new AsyncCallback() { > > > > > > > > > > public void onFailure( Throwable caught ) > > > > > > > > > > { > > > > > > > > > > //Is theexceptioncaught here????? > > > > > > > > > here ! > > > > > > > > > > } > > > > > > > > > > > public void onSuccess( Object result ) > > > > > > > > > > { > > > > > > > > > > > } > > > > > > > > > > try > > > > > > > > > > { > > > > > > > > > > createNewRuleService.createRule( > > > > > > > > > > screenType, > > > > > > > > > > eventRuleForm, callBack ); > > > > > > > > > > } > > > > > > > > > > catch ( IllegalDateRangeException e ) > > > > > > > > > > { > > > > > > > > > > //// or theexceptionis caught here? > > > > > > > > > > > } > > > > > > > > > > You should notice the differences between RemoteInterface > > > > > > > > > and its > > > > > > > > > Asyn counter part: > > > > > > > > > * return type: the asyn interface method doesn't have return > > > > > > > > > value > > > > > > > > > ===> it will be pass as parameter asynchronously in > > > > > > > > > onSuccess > > > > > > > > > callback. > > > > > > > > > *exception: are not part of the async method ===> it will > > > > > > > > > be pass > > > > > > > > > as parameter asynchronously in onFailure callback. > > ... > > read more » --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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