Vaadin6 Maven how to add GWT stuff to jar

Hello,

in the past we had built our applications with vaadin6 and ant tasks.
We are currently switching over to the maven build process, to simpler be able to move to vaadin7 at a later date.

I have a pom file which generates a war and the jar of the java code.
In the jar (or in anpther jar) I would also need to include the widgetset,
but so far I have not been able to include it.

Has anyone some hints on how to do this?

Here the pom part which generates the jar file:

<?xml version="1.0" encoding="UTF-8"?>


4.0.0
com.aarboard
aarcat2-web
war
300.1-SNAPSHOT
Aarcat2 Web Maven Hauptprojekt

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>${maven-jar-plugin-version}</version>
            <executions>
                <execution>
                    <id>make-a-jar</id>
                    <phase>package</phase>
                    <goals>
                        <goal>jar</goal>
                    </goals>
                    <configuration>
                        <includes>
                            <include>classes/**/*</include>
                        </includes>
                    </configuration>                   
                </execution>
            </executions>
        </plugin>