<plugin>
    <artifactId>maven-clean-plugin</artifactId>
    <version>2.2</version>
    <executions>
      <execution>
        <id>auto-clean</id>
        <phase>install</phase>
        <goals>
          <goal>clean</goal>
        </goals>
        <configuration>
          <filesets>
            <fileset>
              <directory>${project.build.outputDirectory}</directory>
              <includes>
                <include>**/*.jar</include>
              </includes>
            <fileset>
           <filesets>
         </configuration>
      </execution>
    </executions>
  </plugin>