Vaadin 6 to 7 migration - UI provider error -

i migrating vaadin 6 vaadin 7. after deploying jboss 7.1.1, can open page, there comes error:

does know means in general , how possibly solve it?

thanks in advance

in web.xml file need provide ui init param, should qualified class name of ui class.

example:

<servlet>     <servlet-name>myservlet</servlet-name>     <servlet-class>com.vaadin.server.vaadinservlet</servlet-class>     <init-param>         <param-name>ui</param-name>         <param-value>my.package.myui</param-value>     </init-param> </servlet> 

alternatively, can have custom ui provider:

<servlet>      <servlet-name>myservlet</servlet-name>      <servlet-class>com.vaadin.server.vaadinservlet</servlet-class>      <init-param>          <param-name>uiprovider</param-name>          <param-value>my.package.myuiprovider</param-value>      </init-param>  </servlet> 

more implementing custom ui providers here.