The simplest way to parse a CSV in Java, period. < 30 lines, including comments and imports.

SimplestCSVParser.java

import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SimplestCSVParser {

  // private constructor -- utility class
  private SimplestCSVParser(){}

  // where the magic happens
  public static ArrayList<String> lineOfCSV (String line) {

    // regex string for parsing lines of CSV
    String regex = "(?:,|\\n|^)((?:\"(?:(?:\"\")*(?:[^\"])*)*\")|(?:[^\",\\n]*)|(?:\\n|$))";

    // compile regex pattern and apply it to the given line
    Matcher matcher = Pattern.compile(regex).matcher(line);

    // save all of the matches to this ArrayList
    ArrayList<String> list = new ArrayList<>();
    while (matcher.find()) list.add(matcher.group(1));

    // If the first character of a line is a comma, the regex above will miss
    // the fact that the first entry is null. So we add an empty String to the
    // beginning of the ArrayList.

    if (line.charAt(0) == ',') list.add(0, "");
    
    // that's it!
    return list;
  }
}

/* If you wan't a code-golfed version:

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import java.util.*;
import java.util.regex.*;

public class G {
 public ArrayList<String> o (String l) {
  Matcher m = Pattern.compile("(?:,|\\n|^)((?:\"(?:(?:\"\")*(?:[^\"])*)*\")|(?:[^\",\\n]*)|(?:\\n|$))").matcher(l);
  ArrayList<String> r = new ArrayList<>();
  while (m.find()) r.add(m.group(1));
  if (l.charAt(0) == ',') r.add(0, "");
  return r;
}}

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*/