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Editorial Team
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Asked: 2026-05-25T12:53:16+00:00

I’m using a mechanism to pass bootstrapping information embedded in the host page (which

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I’m using a mechanism to pass bootstrapping information embedded in
the host page (which is a servlet/jsp combination) from the server to
the client. The bootstrapping information contains vital information
that is required during client start up which saves one client/server
round trip and therefore speeds up application start up.

I’m using Gson to serialize the bootstrapping information and inject
it directly into a tag in the host page. The information is
accessed on the client using JS Overlay Types. Because passing
long values from JS to Java isn’t supported by GWT I’m using a custom
JsonSerializer which turns all longs/Longs into Strings.

All of this works fine but it is a little fragile. Therefore I’d love
to verify the correct behavior in an integration test which covers
both the server and the client side components. This is where I ran
into trouble: Gson (used in the server side component) isn’t GWT
compatible and JS Overlay Types obviously aren’t Java compatible.

My question is: Is it possible to write a GWTTestCase which runs some
parts of the code as pure Java (ie. on the integrated server)? If not,
do you have any other recommendations on how to test this?

Thanks a lot!
Michael

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1 Answer

  1. Editorial Team

    Write a servlet for you test using Gson, that you map using a <servlet path="…" class="…" /> tag in a gwt.xml (make one specifically for your tests that inherits the one from your application/production-module); then write a GWTTestCase for the client-side.

    Have a look at how GWT tests itself (RequestBuilder, GWT-RPC, FormPanel), e.g. http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/test/com/google/gwt/http/

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