Vaadin 7.1.1: Failed to load the widgetset

Question

I have problem to run latest Vaadin 7.1.1 applications. It's mostly because I cannot find documentation for that version. Maven archetype creates old style app extending Root. Root is gone, so I'm trying to extend UI, like they do in Book of Vaadin.

web.xml:

<servlet>
    <servlet-name>myservlet</servlet-name>
    <servlet-class>
        com.vaadin.server.VaadinServlet
    </servlet-class>

    <init-param>
        <param-name>UI</param-name>
        <param-value>cz.simplecoin.simplegui.MainScreen</param-value>
    </init-param>
</servlet>

and MainScreen simply:

public class MainScreen extends UI {

Project compiles (with maven) correctly. When I debug I see init method of MainScreen called correctly, but I see only blank screen (bootstrap JavavScript is there) with the alert:

Error:

Failed to load the widgetset:./VAADIN/widgetsets/com.vaadin.DefaultWidgetSet/com.vaadin.DefaultWidgetSet.nocache.js?1393503103223

I want to start with Default widgetset. I'm almost sure that it's somehow problem in maven build/dependency. I have no Idea what libraries to use: I tried both variants (commented)

pom.xml:

<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-server</artifactId>
    <version>${vaadin.version}</version>
</dependency>
<!--
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-themes</artifactId>
    <version>${vaadin.version}</version>
</dependency>
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-client</artifactId>
    <version>${vaadin.version}</version>
</dependency>
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-client-compiler</artifactId>
    <version>${vaadin.version}</version>
</dependency>
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-theme-compiler</artifactId>
    <version>${vaadin.version}</version>
</dependency>
<dependency>
    <groupId>com.vaadin.addon</groupId>
    <artifactId>vaadin-charts</artifactId>
    <version>1.0.0</version>
</dependency>
-->

I may try to use own widgetset,to see if that solves the issue.

Answer 1

Well I got it finally up by adapting latest demo app pom.xml directly from git. Missing widgetset is in

<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-client-compiled</artifactId>
    <version>${vaadin.version}</version>
</dependency>