Hi Antonio, The “load”method that you showed in the code snippet starts the invocation of an RPC method on the spotDataService. But the AsyncResponse object that you provide in the loadDataServer will only get invoked after the method already returned.
Any async operation that you do is not executed right away. A request is sent by the browser to your server (as you see in the server logs), but the loadDataServer method in the browser returns immediately, it does not wait for the response. So the provided callback is not yet called when the method returns. As a result, the load method will return the current value of objectRet (probably null or an old value). Afterwards when the response is received from the server, the callback method gets invoked to handle the success or failure in the browser (so that is why I said that this Class.forName will not work … the callback code runs in the browser, not the server). So in the end you will probably see the Window.alert statements getting executed, but not when you expect it. >From the code + logs that you have given us I don’t know if you get a success >or failure since you did not provide the information you are showing in the >window.alert invocations (which, if I recollect that correctly, will popup >some modal dialogs in the browser). On 13 Oct 2021, 14:20 +0200, Guillen Antonio <[email protected]>, wrote: > Hi David, > > Thanks a lot for your remarks, but I need some explanation, as tell in my > message i am bot confortable with http/server/remote, .... > > 1. You say: The most important being that you are ignoring the fact that an > rpc call is asynchronous. So the load method will ralways return null because > the request has not been executed when the method returns. > But it's always that is describe in all the examples of GWT. And the > request is yet execute on the return method, as is shown here after: > <image.png> > 2.You say: Another problem is the fact that the async is returning > List<Object>.... > But I have the same problem if I return a List<CartographyImpl> and if i set > no more Class.forName but CartographyImpl > 3. see above. > > So can you give me more informations... > > Thanks a lot for your help > > Antonio > > > > > Le mer. 13 oct. 2021 à 12:03, David Nouls <[email protected]> a écrit : > > > > > > I see multiple problems with your code. The most important being that you > > > are ignoring the fact that an rpc call is asynchronous. So the load > > > method will ralways return null because the request has not been executed > > > when the method returns. > > > > > > Another problem is the fact that the async is returning List<Object>, > > > which would mean gwt needs to generate serializers for all object types > > > in you application at compile time. > > > > > > Another one is that you seem to want to use java introspection to > > > dynamically load classes in GWT, which is not supported (Class.forName). > > > On 13 Oct 2021, 09:58 +0200, Guillen Antonio <[email protected]>, > > > wrote: > > > > HI all, > > > > > > > > I am not comfortable with client-server and RPC and HTTPServlet > > > > operation at all. > > > > I get the following message after my request: > > > > > > > > 200 - POST /spotgwt/spotData (127.0.0.1) 496 bytes > > > > Request headers > > > > Host: 127.0.0.1:8887 > > > > User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) > > > > Gecko/20100101 Firefox/92.0 > > > > Accept: */* > > > > Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3 > > > > Accept-Encoding: gzip, deflate > > > > Content-Type: text/x-gwt-rpc; charset=utf-8 > > > > X-GWT-Permutation: A082E84D087467DED16699006D694A7B > > > > X-GWT-Module-Base: http://127.0.0.1:8887/spotgwt/ > > > > Content-Length: 228 > > > > Origin: http://127.0.0.1:8887 > > > > DNT: 1 > > > > Connection: keep-alive > > > > Referer: http://127.0.0.1:8887/SpotGWT.html > > > > Sec-Fetch-Dest: empty > > > > Sec-Fetch-Mode: cors > > > > Sec-Fetch-Site: same-origin > > > > Response headers > > > > Date: Wed, 13 Oct 2021 07:40:08 GMT > > > > Content-Encoding: gzip > > > > Content-Length: 496 > > > > Content-Type: application/json; charset=utf-8 > > > > Content-Disposition: attachment > > > > > > > > Can you tell me what this means. Because at first glance I understand > > > > that my request is successful, and the content of the response is in a > > > > zip and that the length of the zip is 496 bytes in json format. > > > > Attachment ????? > > > > > > > > The problem is that my RPC call tells me that it has failed in the > > > > following piece of code: > > > > > > > > > > > > <image.png> > > > > I look forward to your reply. > > > > Thanks a lot for your help > > > > Antonio > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "GWT Users" group. > > > > To unsubscribe from this group and stop receiving emails from it, send > > > > an email to [email protected]. > > > > To view this discussion on the web visit > > > > https://groups.google.com/d/msgid/google-web-toolkit/CAKULUq_jF_Z96s43u_Gm7Z6omqU6H7fQ8758DmTX8yavu1mBMg%40mail.gmail.com. > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "GWT Users" group. > > > To unsubscribe from this group and stop receiving emails from it, send an > > > email to [email protected]. > > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/google-web-toolkit/48970e18-bc80-4df0-b8d7-84adde1c63cb%40Spark. > -- > You received this message because you are subscribed to the Google Groups > "GWT Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-web-toolkit/CAKULUq9dSLVNG2KhhfFE29px9_F8-tOP2hQ5KYmpFsnfqkEV8A%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "GWT Users" group. 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