@BeforeClass
 public static void prepareDataSet() throws Exception {
   SimpleMemoryContextFactory.setUpAsInitialContext();
   InputStream in =
       JpaSharingTicketService.class
           .getClassLoader()
           .getResourceAsStream("com/silverpeas/sharing/services/sharing_security_dataset.xml");
   try {
     dataSet = new ReplacementDataSet(new FlatXmlDataSetBuilder().build(in));
     dataSet.addReplacementObject("[NULL]", null);
     DBUtil.clearTestInstance();
   } finally {
     IOUtils.closeQuietly(in);
   }
 }