Parsing empty column with OpenCSV

Lets say you have the following 2 lines csv file :

jules,23
thomas,

And object :

Class Person {
  String name;
  Integer age;
  //getter + setter
}

When you use the java opencsv library to map that csv to the object, it will throw an exception :

Caused by: java.lang.NumberFormatException: Zero length string at 
java.lang.Integer.decode(Integer.java:1162) at 
com.sun.beans.editors.IntegerEditor.setAsText(IntegerEditor.java:39) at 
au.com.bytecode.opencsv.bean.CsvToBean.convertValue(CsvToBean.java:82) at 
au.com.bytecode.opencsv.bean.CsvToBean.processLine(CsvToBean.java:63) at 
au.com.bytecode.opencsv.bean.CsvToBean.parse(CsvToBean.java:48) … 22 more

[doesn’t work!!!!] After looking at the source code I tried to add my custom PropertyEditor:

public class IntegerEmptyEditor extends NumberEditor {
    public IntegerEmptyEditor() {
    }
    public void setAsText(String var1) throws IllegalArgumentException {
        this.setValue(var1 == null || var1.equals("")?null:Integer.decode(var1));
    }
}

PropertyEditorManager.registerEditor(Integer.class, IntegerEmptyEditor.class);
PropertyEditor pe = PropertyEditorManager.findEditor(Integer.class);
//  BUT RETURN IntegerEditor instead of IntegerEmptyEditor</span>

Instead, let’s treat all empty string value like null value :

CsvToBean csv = new CsvToBean() {
    protected Object convertValue(String value, PropertyDescriptor prop) throws InstantiationException, IllegalAccessException {
        if(StringUtils.isEmpty(value)) {
            value = null;
        }
        return super.convertValue(value, prop);
    }
};

Complete code mapping the csv file to the object :

CSVReader csvReader = new CSVReader(new FileReader("src/test/resources/utils/csv/person.csv"));
ColumnPositionMappingStrategy strat = new ColumnPositionMappingStrategy();
strat.setType(Person.class);
String[] columns = new String[] {"name", "age"};
strat.setColumnMapping(columns);
CsvToBean csv = new CsvToBean() {
    protected Object convertValue(String value, PropertyDescriptor prop) throws InstantiationException, IllegalAccessException {
        if(StringUtils.isEmpty(value)) {
            value = null;
        }
        return super.convertValue(value, prop);
    }
};
List<StopExt> list = csv.parse(strat, csvReader);
csvReader.close();