title: Warning about invalid maven-metadata-nexus.xml during Maven install
body: <p>I'm getting the following warning when running <code>maven clean install</code> on my java project.</p>
  
  <blockquote>
    <p>[WARNING] The metadata .m2/repository/.../maven-metadata-nexus.xml is invalid: entity reference name can not contain character =' (position: TEXT seen ...tent/groups/public/com/github/jnr/jffi/maven-metadata.xml&amp;arubalp=... @3:147)</p>
  </blockquote>
  
  <p>I'm using a Nexus as a Maven repository mirror which is configured in my settings.xml.</p>