In specification for javax.swing.RowFilter
public static RowFilter regexFilter(java.lang.String regex,
                                    int... indices)
public static RowFilter dateFilter(RowFilter.ComparisonType type,
                                   java.util.Date date,
                                   int... indices)
public static RowFilter numberFilter(RowFilter.ComparisonType type,
                                     java.lang.Number number,
                                     int... indices)

methods there is the sentence:
"java.lang.IllegalArgumentException - if any of the columns contains a value < 0"

What is meant by the "columns contains a value"? I guess that exception concerns indices.