I have a GWT page where user enter data (start date, end date, etc.), then this data goes to the server via RPC call. On the server I want to generate Excel report with POI and
You can do that just using GWT RPC and Data URIs:
myMethod
return the file content.Window.open
to open a file save dialog passing the formatted DataURI.Take a look at this reference, to understand the Data URI usage:
Export to csv in jQuery