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Read a file into a Maven property
<plugin>
  <groupId>org.codehaus.gmaven</groupId>
  <artifactId>gmaven-plugin</artifactId>
  <version>1.4</version>
  <executions>
    <execution>
      <phase>generate-resources</phase>
      <goals>
        <goal>execute</goal>
      </goals>
      <configuration>
        <properties>
          <header_file>header.html</header_file>
        </properties>
        <source>
          def file = new File(project.properties.header_file)
          project.properties.header_content = file.getText()
        </source>
      </configuration>
    </execution>
  </executions>
</plugin>