Vaadin and hapi-fhir

Hi there!
I am trying to use Vaadin as UI for displaying resources on hapi-fhir server.
To the point:
When I add FHIRContext object, i get No Class Definition Error even i have the required hapi-fhir jars added to “referenced library” of the project.
Anyone used Vaadin and hapi-fhir can guide me???
Thanks in advance.

What class gives that error? Is it included in your classpath?