Program: 51903
Project: 51903
Buggy source:
/** 
 * Process a node in the metadata registry XML file.  If the schema already exists, it will not be recreated
 * @param context DSpace context object
 * @param node the node in the DOM tree
 * @throws NonUniqueMetadataException
 */
private static void loadSchema(Context context,Node node,boolean updateExisting) throws SQLException, IOException, TransformerException, AuthorizeException, NonUniqueMetadataException, RegistryImportException {
  String name=RegistryImporter.getElementData(node,"String_Node_Str");
  String namespace=RegistryImporter.getElementData(node,"String_Node_Str");
  if (name == null || "String_Node_Str".equals(name)) {
    throw new RegistryImportException("String_Node_Str");
  }
  if (namespace == null || "String_Node_Str".equals(namespace)) {
    throw new RegistryImportException("String_Node_Str");
  }
  MetadataSchema s=metadataSchemaService.find(context,name);
  if (s == null) {
    log.info("String_Node_Str" + name + "String_Node_Str"+ namespace+ "String_Node_Str");
    metadataSchemaService.create(context,name,namespace);
  }
 else {
    if (s.getNamespace().equals(namespace)) {
      return;
    }
    if (updateExisting) {
      log.info("String_Node_Str" + name + "String_Node_Str"+ namespace);
      s.setNamespace(namespace);
      metadataSchemaService.update(context,s);
    }
 else {
      throw new RegistryImportException("String_Node_Str" + name + "String_Node_Str"+ namespace+ "String_Node_Str");
    }
  }
}

Fixed version (ground truth):
/** 
 * Process a node in the metadata registry XML file.  If the schema already exists, it will not be recreated
 * @param context DSpace context object
 * @param node the node in the DOM tree
 * @throws SQLException if database error
 * @throws IOException if IO error
 * @throws TransformerException if transformer error
 * @throws AuthorizeException if authorization error
 * @throws NonUniqueMetadataException if duplicate metadata
 * @throws RegistryImportException if import fails
 */
private static void loadSchema(Context context,Node node,boolean updateExisting) throws SQLException, IOException, TransformerException, AuthorizeException, NonUniqueMetadataException, RegistryImportException {
  String name=RegistryImporter.getElementData(node,"String_Node_Str");
  String namespace=RegistryImporter.getElementData(node,"String_Node_Str");
  if (name == null || "String_Node_Str".equals(name)) {
    throw new RegistryImportException("String_Node_Str");
  }
  if (namespace == null || "String_Node_Str".equals(namespace)) {
    throw new RegistryImportException("String_Node_Str");
  }
  MetadataSchema s=metadataSchemaService.find(context,name);
  if (s == null) {
    log.info("String_Node_Str" + name + "String_Node_Str"+ namespace+ "String_Node_Str");
    metadataSchemaService.create(context,name,namespace);
  }
 else {
    if (s.getNamespace().equals(namespace)) {
      return;
    }
    if (updateExisting) {
      log.info("String_Node_Str" + name + "String_Node_Str"+ namespace);
      s.setNamespace(namespace);
      metadataSchemaService.update(context,s);
    }
 else {
      throw new RegistryImportException("String_Node_Str" + name + "String_Node_Str"+ namespace+ "String_Node_Str");
    }
  }
}