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POI - unable to create custom validation for a range of cells

 
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I need to check if the user has entered a valid number in a cells A1:A10. In Excel i would choose the cells, and then create a custom validator, and set the formula to =isNumber("$A$1:$A10") Trying do this using POI is getting me all tied in knots: Here is what i have tried:
CellRangeAddressList addressList = new CellRangeAddressList(0, 10, 0, 0);
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
DataValidationConstraint customConstraint = dvHelper.createCustomConstraint("isNumber(\"$A$0:$A$10\"");
XSSFDataValidation validation = (XSSFDataValidation)dvHelper.createValidation(customConstraint, addressList);
validation.setShowErrorBox(true);
sheet.addValidationData(validation);

When i try and open this in Excel, i get an error, and Excel disables the validation

thanks in advance -anish
 
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