404 exception when invoking gwt service from custom vaadn component

I need to invoke a GWT service from a custom VAADIN component.

I get 404 exception. I am not able to find information to determine if the settings I have are correct.

Please help…

Google says to add serlet/servlet-mapping where servlet mapping has to have
module descriptor name and second part has to be the string passed to the annotation
http://code.google.com/webtoolkit/doc/1.6/DevGuideServerCommunication.html#DevGuideServerSide

Using the xample of color picker, I get the 404 exception?

Never mind it got resolved…there was a typo :frowning: in my url mapping.
Thanks for the great toolkit and the sweet licence.