Application.java

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void uploadPicture(Picture picture) {
        picture.save();
        index();
    }
    public static void getPicture(long id) {
        Picture picture = Picture.findById(id);
        response.setContentTypeIfNotSet(picture.image.type());
        renderBinary(picture.image.get());
    }
}

index.html

<ul>
#{list items:models.Picture.findAll(), as:'picture'}
    <li>${picture.id} <img src="@{Application.getPicture(picture.id)}" /></li>
#{/list}
</ul>

#{form @Application.uploadPicture(), enctype:'multipart/form-data'}

    <input type="file" name="picture.image" />
    <input type="submit" name="submit" value="Save" />
#{/form}

Picture.java

@Entity
public class Picture extends Model {
    public Blob image;  
}