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
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