Test case for bug (See http://stackoverflow.com/questions/14036441/how-can-i-tell-supercsv-to-map-empty-string-attributes-when-using-csvdozerbea)

DozerBugTest.java

package supercsv.test;

import static org.supercsv.prefs.CsvPreference.STANDARD_PREFERENCE;

import java.io.IOException;
import java.io.PrintWriter;

import org.supercsv.cellprocessor.Optional;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.io.dozer.CsvDozerBeanWriter;
import org.supercsv.io.dozer.ICsvDozerBeanWriter;

public class DozerBugTest {
    private static final String[] FIELD_MAPPING = new String[]{ "firstName",
            "middleName", "lastName" };

    private static final CellProcessor[] PROCESSORS = new CellProcessor[]{
            new Optional(), new Optional(), new Optional() };

    private static final String[] HEADER = new String[]{ "First_Name",
            "Middle_Name", "Last_Name" };

    public static void main(String[] args) throws Exception {
        Person person = new Person();
        person.setFirstName("The Joker");
        person.setMiddleName(null);
        person.setLastName(""); // Empty String

        ICsvDozerBeanWriter beanWriter = null;

        try {
            beanWriter = new CsvDozerBeanWriter(new PrintWriter(System.out),
                    STANDARD_PREFERENCE);
            beanWriter.configureBeanMapping(Person.class, FIELD_MAPPING);
            beanWriter.writeHeader(HEADER);
            beanWriter.write(person, PROCESSORS);
            
        } catch (IOException e) {
            e.printStackTrace();

        } finally {
            if (beanWriter != null) {
                beanWriter.close();
            }
            
        }

    }

}

Person.java

package supercsv.test;

public class Person {
    private String firstName;
    private String middleName;
    private String lastName;

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getMiddleName() {
        return middleName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public void setMiddleName(String middleName) {
        this.middleName = middleName;
    }

}

Stacktrace

First_Name,Middle_Name,Last_Name
Exception in thread "main" org.supercsv.exception.SuperCsvException: The number of columns to be processed (2) must match the number of CellProcessors (3): check that the number of CellProcessors you have defined matches the expected number of columns being read/written
context={lineNo=2, rowNo=2, columnNo=1, rowSource=[The Joker, null]}
	at org.supercsv.util.Util.executeCellProcessors(Util.java:78)
	at org.supercsv.io.dozer.CsvDozerBeanWriter.write(CsvDozerBeanWriter.java:133)
	at supercsv.test.DozerBugTest.main(DozerBugTest.java:36)