GWT Module XXX not found in project sources or resources - gwt

Question

I have the widgetset compiled with the Maven goals: vaadin:update-widgetset gwt:compile. So the pom.xml and web.xml files configurations should be fine.
I'm a Maven newbie and this is my first Maven project.
After compilation the compiled code shows in src/main/webapp/VAADIN/widgetsets folder. When I try to run the install goal the error shows:
Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.2.0:resources (default) on project Validation-Manager-Web: GWT Module com.pantar.widget.graph.GraphWidget not found in project sources or resources.
Just in case here are the relevant files:
POM:
<plugins>
<!-- Compiles your custom GWT components with the GWT compiler -->
<!-- A hosted mode browser for client-side widget debugging can be run with the goal gwt:run after uncommenting the
correct line below. A remote debugger can then be connected to port 8998. Note that e.g. a Jetty server should be running
with the server side parts - use the goal jetty:run . -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>${gwt.plugin.version}</version>
<configuration>
<!-- if you don't specify any modules, the plugin will find them -->
<modules>
<module>com.pantar.widget.graph.GraphWidget</module>
</modules>
<webappDirectory>src/main/webapp/VAADIN/widgetsets</webappDirectory>
<!-- On Mac running Snow Leopard, add "-d32" -->
<!-- This causes error messages (but build works) in phase "package": two processes would use the same debug
port -->
<!--extraJvmArgs>-Xmx512M -Xss1024k -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8998</extraJvmArgs -->
<extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
<runTarget>Validation-Manager-Web</runTarget>
<hostedWebapp>${project.build.directory}/${project.build.finalName}</hostedWebapp>
<noServer>true</noServer>
<port>8084</port>
<compileReport>false</compileReport>
</configuration>
<executions>
<execution>
<goals>
<goal>resources</goal>
<goal>compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<version>${gwt.version}</version>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwt.version}</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>1.0.2</version>
<executions>
<execution>
<configuration>
<modules>
<module>com.pantar.widget.graph.GraphWidget</module>
</modules>
</configuration>
<goals>
<goal>update-widgetset</goal>
</goals>
</execution>
</executions>
</plugin>
Any ideas?
Thanks in advance!

Answer 1

Fixed it by adding an empty gwt.xml file with this contents:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.0/distro-source/core/src/gwt-module.dtd">
<module>
<inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" />
<inherits name="<module>" />
</module>