title: BIRT report exports to XLSX in design mode but not in Runtime
body: <p>I am using Birt. Calling it from javascript to run my report at run time.</p>
  <p>When I am developing my report everything goes great. When I deploy it and it no longer likes to export to XLSX files.</p>
  <p><code>http://marquetta:8080/birt/frameset?__report=http://marquetta/reports/userList.rptdesign&amp;__format=XLSX</code></p>
  <p>all other formats seem to work fine. The above creates an exception:</p>
  <blockquote>
  <p>&quot;Caused by: org.eclipse.birt.report.engine.api.EngineException: Error happened while running the report.</p>
  <p>Caused by: java.lang.SecurityException: class &quot;org.apache.poi.POIXMLDocument&quot;'s signer information does not match signer information of other classes in the same package
  &quot;</p>
  </blockquote>