Hello,
I'm having problem with creating dropdown cells with many array items (this
is country list), It is actually working with approximately 100-150
countries but not with all countries. When there are more countries, the
comma deliminated countries string will be in a cell. I'm using the latest
version of POI 3.8 beta 5   and still having problem. Here is the code which
is the same with given here:
http://poi.apache.org/spreadsheet/quick-guide.html#Validation Data
Validations 

   Workbook workbook = new HSSFWorkbook();
   Sheet sheet = workbook.createSheet("Data Validation");
   CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0);
   DVConstraint dvConstraint =
DVConstraint.createExplicitListConstraint(countries);
   DataValidation dataValidation = new HSSFDataValidation (addressList,
dvConstraint);
   dataValidation.setSuppressDropDownArrow(false);
   sheet.addValidationData(dataValidation);

How can I solve this problem ? 
Thanks in advance!!!

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