avoid class cast exception in multiple file selection

[pithos] / mbeans / META-INF / jboss-service.xml

<?xml version="1.0" encoding="UTF-8"?>

<!-- ===================================================================== -->
<!--                                                                       -->
<!--  Indexing JMX Service                                                                     -->
<!--                                                                       -->
<!-- ===================================================================== -->
<server>

  <mbean code="gr.ebs.gss.mbeans.Solr" name="gss:name=Solr">
  </mbean>

</server>