Chart maven tomcat

Hi All, 

Please, I need help with adding Chart to my code. 

I added the dependency to the pom file and the repository as well. 

<repository>
            <id>vaadin-addons</id>
               <url>http://maven.vaadin.com/vaadin-addons</url>
        </repository>        
        <dependency>
           <groupId>com.vaadin.addon</groupId>
           <artifactId>vaadin-charts</artifactId>
           <version>3.0.0-alpha8</version>
        </dependency>

My code as following : 

@WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class, widgetset = "REWEChallenge.Team5.AppWidgetSet")
    public static class Servlet extends VaadinServlet 
    {
    }

    @Override
    protected void init(VaadinRequest request) {
        
        layoutMain.setMargin(true);
        layoutMain.setSpacing(true);
        
        setContent(layoutMain);   
        
        
        Configuration configuration = chart.getConfiguration();
        configuration.setTitle("Simple Tutorial");
        
        XAxis xAxis = configuration.getxAxis();
        xAxis.setType(AxisType.LINEAR);
        
        final DataSeries listSeries1 = new DataSeries();
        listSeries1.setPlotOptions(new PlotOptionsArea());
        configuration.addSeries(listSeries1);
        layoutMain.addComponent(chart);
        int i=0;
        
        for(i=0; i < 100 ; i++)
        {
            DataSeriesItem item = new DataSeriesItem(i, 1 + (Math.random()*100)*3);
            listSeries1.add(item);
        }
        
        final int aa = i;
        new Timer().scheduleAtFixedRate(new TimerTask() 
        {
            int ff = aa;
            public void run() 
            {
                DataSeriesItem item1 = new DataSeriesItem(ff++, 1 + (Math.random()*100)*3);
                listSeries1.add(item1, true, true);
                getUI().push();
            }
         }, new Date(), 1000);
    }

 when I am ruuning the code on tomcat server I got the following error : 

Widgetset does not contain implementation for com.vaadin.addon.charts.Chart.
Check its component connector's @Connect mapping, widgetsets GWT module description file and re-compile your widgetset.
In case you have downloaded a vaadin add-on package, you might want to refer to add-on instructions.

SEVERE: Servlet.service() for servlet [REWEChallenge.Team5.MyVaadinUI$Servlet] in context with path [/Team5.Bayreuth] threw exception [com.vaadin.server.ServiceException: java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at org.eclipse.jetty.websocket.WebSocketFactory.upgrade(WebSocketFactory.java:225)
    at org.eclipse.jetty.websocket.WebSocketFactory.acceptWebSocket(WebSocketFactory.java:361)
    at org.atmosphere.container.JettyWebSocketUtil.doService(JettyWebSocketUtil.java:65)
    at org.atmosphere.container.JettyAsyncSupportWithWebSocket.service(JettyAsyncSupportWithWebSocket.java:69)
    at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1448)
    at com.vaadin.server.communication.PushRequestHandler.handleRequest(PushRequestHandler.java:109)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1371)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:238)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

I have the free trial 30 days license and I put it on my home directory.

I appreciate any kind of help. 

Thanks in advance,
 

solved. 

Just unhint the the following dependency in pom file : 

<dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-client-compiler</artifactId>
            <version>${vaadin.version}</version>
            <scope>provided</scope>
        </dependency>

Thanks all