Using A Java Application As Client to App Engine?

[Eric Atkinson]

For various reasons, I don't want to use a browser as my client. Why? Because, for example, although the Chrome browser can render my rather complex GWT client just fine, IE can't render it even if you install the Chrome Frame Plug-In, so I simply don't trust browsers as clients (too many uncontrollable unknowns). Consequently, instead of using a browser as client, I want to use a Java Application as client installed from GAE using JNLP (and I've got this part working on GAE after a bit trial and error on my part).  My question is: If I use a Java Application as client then the GWT (not GAE) documentation seems to be saying that I'll need to use com.google.gwt.http.client.* to make my calls to the servleta using XML to pass data, and then converting the XML into JDO objects for the datastore. Does this sound right? I only ask because I don't want to do a lot of work trying this if GAE requires the client to be a browser (in which case I have to forgo using GAE because I hate browsers as clients).

[Wilson MacGyver]

there are plenty of examples of people using GAE with non-browsers.
Using it as a web
service isn't uncommon. I know there are android apps and iOS apps that uses GAE
as the backend web services. So I don't think you are doing anything
unusual or uncommon.

JSON, XML is all fair game. Heck, python side google even added ProtoRPC.

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[Jeff Schnitzer]

For Java<->Java, Hessian works well - no fuss, just Java methods and Java objects.

Jeff