ArraIndexOutOfBoundsException when looping through DataSet after a delete:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 2
        at java.util.Vector.get(Vector.java:694)
        at com.sun.sql.DataSetImpl$DataSetItr.next(DataSetImpl.java:1797)
        at EODDeleteBug.main(EODDeleteBug.java:80)
May be reproduced by:

import java.sql.*;

public class EODDeleteBug
{
    static public class Person {
        public Person() {
            // Needed for DataSet
            firstName = null;
            lastName = null;
        }
        public Person(String f, String l) {
            firstName = f;
            lastName = l;
        }
        public String firstName;
        @ResultColumn(uniqueIdentifier=true)
            public String lastName;
        public String toString()
        {
            if (firstName == null) {
                return lastName;
            } else {
                return lastName + ", " + firstName;
            }
        }
        public boolean equals(Person other)
        {
            if (firstName == null) {
                return lastName.equals(other.lastName);
            } else {
                return lastName.equals(other.lastName) &&
                    firstName.equals(other.firstName);
            }
        }
    }

    interface PersonQueryObject extends BaseQuery {

        @Select(sql="select firstName, lastName from persons")
            DataSet<Person> getPersons();

        @Select(sql="select firstName, lastName from persons", readOnly=false)
            DataSet<Person> getAndUpdatePersons();

        @java.sql.Update(sql="insert into persons values (?1,?2)")
            int insertPerson(String a, String b);

        @java.sql.Update(sql="create table persons (firstName varchar(256), lastName varchar(256) unique not null)")
            int createTable();
    }



    static public void main(String []args)
        throws Exception
    {
String driver = "org.apache.derby.jdbc.EmbeddedDriver";
String url = "jdbc:derby:/export/home/tmp/DB/eod;create=true";
        Class.forName(driver);

        Connection conn = DriverManager.getConnection(url);

        PersonQueryObject pqo = conn.createQueryObject(PersonQueryObject.class);
        pqo.createTable();

        pqo.insertPerson("John","Doe");
        pqo.insertPerson("Wu","Ming");

        DataSet<Person> dsp = pqo.getAndUpdatePersons();

        System.out.println("--- 1 Delete one of them ---------------------");
        for (Person p: dsp) {
            System.out.println("Found: " + p);
            if (p.lastName.equals("Ming")) {
                dsp.delete();
            }
        }

        System.out.println("--- 2 Loop through again ---------------------");
        for (Person p: dsp) {
            System.out.println("Found: " + p);
        }
        dsp.close();
        pqo.close();

    }
}