how to use PropertyModel for saving image to database

hi,

i have a file upload process for image.

fileupload.java
https://gist.github.com/cortix/9079660

User1.java
https://gist.github.com/cortix/f5fbc0a137d6acfa9b40

fileupload.html
https://gist.github.com/cortix/9082148

i got this error
https://gist.github.com/cortix/9079743

...
final FileUploadField fileUpload = new FileUploadField("fileUpload",new
PropertyModel(user1, "photo"));
form.add(fileUpload);
...

i think i should change my ProperyModel or the method for images to save
database because in my pojo class my object type is byte[]... When i use
this way, i get error... i am thinking if this PropertyModel change, i can
fix this problem but i don't know how can i use this PropertyModel for byte
type..

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