Hello, guys, 


I've got a FileUploadField as so: 


 image1UploadField = new FileUploadField("image1_upload", new Model()); 


I aim to know if the field has value set even before the form gets
processed and the item gets uploaded. I want to minimize traffic and memory
usage of my application. Therefore I don't want the file get uploaded
before I know if there really was file specified. 


What's the most proper way to do this in Wicket code? 


Thank you in advance,
Martin 

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