Someone

<plexus>
  <components>
    <component>
      <role>org.codehaus.plexus.discovery.ResourceDiscoverer</role>
      <implementation>org.codehaus.plexus.discovery.mdns.MDNSResourceDiscoverer</implementation>
      <lifecycle-handler>basic</lifecycle-handler>
      <description>A MulticastDNS Service Discoverer</description>
      <requirements>
        <requirement>
          <role>org.codehaus.plexus.discovery.mdns.JmDNSWrapper</role>
          <field-name>jmDNSWrapper</field-name>
        </requirement>
      </requirements>
    </component>
    <component>
      <role>org.codehaus.plexus.discovery.ResourcePublisher</role>
      <implementation>org.codehaus.plexus.discovery.mdns.MDNSResourcePublisher</implementation>
      <lifecycle-handler>basic</lifecycle-handler>
      <description>A MDNS Implementation of an Resource Publisher</description>
      <requirements>
        <requirement>
          <role>org.codehaus.plexus.discovery.mdns.JmDNSWrapper</role>
          <field-name>jmDNSWrapper</field-name>
        </requirement>
      </requirements>
    </component>
    <component>
      <role>org.codehaus.plexus.discovery.mdns.JmDNSWrapper</role>
      <role-hint>default</role-hint>
      <implementation>org.codehaus.plexus.discovery.mdns.JmDNSWrapper</implementation>
      <instantiation-strategy>singleton</instantiation-strategy>
      <lifecycle-handler>basic</lifecycle-handler>
      <description>Wrapper for JmDNS, required for either MDNSResourceDiscoverer and
JMDNSResourcePublisher</description>
    </component>
  </components>
</plexus>