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Vaadin : Widgetset does not contain an implementation.
Hello friends,
I was able to integrate a Vaadin module into our Spring based application. After integration I wanted to run a demo of gantt-charts which is an add-on for Vaadin and found it on github https://github.com/tltv/gantt/tree/master/gantt-demo. Inside the folder, there is a demo project. All is fine, except I am having a problem with widgetsets.
Screenshot of the problem :
Also I get a non-serializable error :
Nov 18, 2015 3:16:48 PM org.apache.catalina.session.StandardManager startInternal
SEVERE: Exception loading sessions from persistent storage
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.journaldev.spring.Vaadin.Util$5
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1355)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
UI code :
@Theme("demo")
@SpringUI
@SuppressWarnings("serial")
public class MyVaadinUI extends UI {
@WebServlet(value = "/testvaadin", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class, widgetset = "org.tltv.gantt.demo.DemoWidgetSet")
public static class Servlet extends SpringVaadinServlet {
}
// Code for gaant-chart taken from demo, code too big and not important //for error
// Pastebin link : http://pastebin.com/mi1ZhH30
}
POM.xml :
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
</repositories>
<dependencies>
<!--- Vaadin dependency -->
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiled</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-push</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>org.tltv.gantt</groupId>
<artifactId>gantt-addon</artifactId>
<version>0.9.0</version>
</dependency>
web.xml :
<servlet-mapping>
<servlet-name>vaadin-spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>cometd</servlet-name>
<servlet-class>org.cometd.server.CometDServlet</servlet-class>
<init-param>
<param-name>timeout</param-name>
<param-value>300000</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
<async-supported>true</async-supported>
</servlet>
What am I doing wrong? Kindly let me know. Thanks a lot. :-)