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The "DIHCustomTransformer" page has been changed by Maurizio Cucchiara:
http://wiki.apache.org/solr/DIHCustomTransformer?action=diff&rev1=11&rev2=12

Comment:
Row map doesn't contain any string values

                                // Apply trim on this field
                                String columnName = 
field.get(DataImporter.COLUMN);
                                // Get this field's value from the current row
-                               String value = row.get(columnName);
+                               Object value = row.get(columnName);
                                // Trim and put the updated value back in the 
current row
                                if (value != null)
-                                       row.put(columnName, value.trim());
+                                       row.put(columnName, 
value.toString().trim());
                        }
                }
  

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