public class EchoProvider extends AbstractMetaDataProvider {
  /**
   * The string to echo.
   */
  private String echo;

  /**
   * The number of times to echo the string.
   */
  private int times;

  /**
   * {@inheritDoc}
   *
   * @see de.smartics.maven.plugin.buildmetadata.data.MetaDataProvider#provideBuildMetaData(java.util.Properties)
   */
  public void provideBuildMetaData(final Properties buildMetaDataProperties)
    throws MojoExecutionException {
    if (times > 0) {
      for (int i = 0; i < times; i++) {
        System.out.println(echo);
      }
    }
  }
}

<plugin>
  <groupId>de.smartics.maven.plugin</groupId>
  <artifactId>buildmetadata-maven-plugin</artifactId>
  <version>1.7.0</version>
  <scope>provided</scope>
</plugin>

 <plugin>
  <groupId>de.smartics.maven.plugin</groupId>
  <artifactId>buildmetadata-maven-plugin</artifactId>
  <configuration>
    <providers>
      <provider>
        <type>de.smartics.sandbox.provider.EchoProvider</type>
        <properties>
          <echo>Beautiful!</echo>
          <times>3</times>
        </properties>
      </provider>
    </providers>
  </configuration>
  <dependencies>
    <dependency>
      <groupId>de.smartics.sandbox</groupId>
      <artifactId>sandbox-buildmetadata-provider</artifactId>
      <version>0.1.0</version>
    </dependency>
  </dependencies>
</plugin>