HTTP Status 415 - request entity is in a format not supported

Question

I am working on java restful web service. I got it working for GET request, but POST request does not work. My Controller class is RestController. I have done these

Answer 1

I'm a bit shamed to write this, but I forgot to put the enctype="multipart/form-data" attribute in the form tag:

    

    Your file is: 
    
    

This is a pretty lame error, but also the one which took some time to realize.