As can be seen in your screenshot, the request goes to 
/myaction/myActionService. The myActionService part comes from the 
@RemoteServiceRelativePath("myActionService"), and the /myaction part comes 
from the module name; or in this case most likely a rename-to="myaction" in 
your module (which is also what triggers GWT into generating a file named 
myaction.nocache.js in a myaction folder).
To make it work, you need to align map your servlet to 
/myaction/myActionService (instead of 
/com.google.gwt.myaction.client.MyAction/myaction)

On Tuesday, June 19, 2018 at 9:38:59 AM UTC+2, Joyce wrote:
>
> Do you have an idea how I can fix that problem? 
> I set my path to @RemoteServiceRelativePath("myActionService") and the 
> url in my web.xml is the following: "
> /com.google.gwt.myaction.client.client.MyAction/myaction". Is there an 
> other way how to set the url? Or how can I tell GWT to use a different 
> url for the service? I tried changing both parameters but in my browser the 
> error description didn't change. It seems to me that the url is configured 
> somewhere else. Thank you!!
>
> Am Montag, 18. Juni 2018 13:16:29 UTC+2 schrieb Jens:
>>
>>
>>
>>> <https://lh3.googleusercontent.com/-0qnTbaEhZ6w/Wyd_Av-0PsI/AAAAAAAAApY/uwi1qs7lvJE4hOzcOvuOZo7jZ2fo0WWYgCLcBGAs/s1600/Bildschirmfoto%2B2018-06-18%2Bum%2B11.34.13.png>
>>>
>>
>> This means GWT has made a request to your server but the servlet is not 
>> registered at the expected location, thus the server responds with a 404 
>> not found status (take a look in your network inspector in the browser). 
>> You either have to update your web.xml or tell GWT to use a different url 
>> for the service. For the latter take a look at the javadoc of 
>> @RemoteServiceRelativePath for details.
>>
>> -- J.
>>
>

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