We need to upload a image from the client to our server in base64 format, jfilechooser is not supported in apengine/client files. Is it possible to do this or not??
You might be able to do so with Clouddb.
Also, have a look at the available extensions. For example on pura vid apps.
I'm pretty sure you can find something that will help.
I think he meant the 'appengine' 
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To perform file uploads, you can use the GWT widget FileUpload, such as in the ProjectUploadWizard.