Add-on canvas for Vaadin 7.x. The problen with drawing local images

Hello. I try to use the add-on Canvas for Vaadin 7. I want to draw an image and invoke canvas.drawImage1(url, x, y) for it.
If url is a link to the image like this “http://webapp.org.ua/wp-content/uploads/2011/10/gwtlogo.jpg” the function work well. I see an image on my page. If I set an url as a link to the local image like this “http://localhost:8080:/myapp/images/logo.jpeg” then i see nothing on my page. I cannot understand what is the reason for this behavior? Any ideas?