Sun's or IBM's BreakIterator

Sun's java.text.BreakIterator is supposed to be synchronized with IBM's ICU4J BreakIterator. Apparently not... The code below shows a puzzling difference in behavior between the sentence iterators included in Java 6 and ICU4J 4.0.

public class Sentences {

  public static void main(String[] args) {
      String testText = "Elle courut à son père et l'embrassa, en l'étreignant.\n - Eh bien, partons-nous? dit-elle.";

      java.text.BreakIterator sunSentenceTokenizer = java.text.BreakIterator.getSentenceInstance();
      com.ibm.icu.text.BreakIterator icuSentenceTokenizer = com.ibm.icu.text.RuleBasedBreakIterator.getSentenceInstance();

      sunSentenceTokenizer.setText(testText);
      icuSentenceTokenizer.setText(testText);
    
      int sentenceStart = 0;
      int sentenceOffset = 0;
      int sentenceCounter = 0;
      System.out.println("sun");
      while ((sentenceOffset = sunSentenceTokenizer.next()) != sunSentenceTokenizer.DONE) {
          System.out.println(sentenceCounter + " " + testText.substring(sentenceStart, sentenceOffset));
          sentenceStart = sentenceOffset;
          sentenceCounter++;
      }

      sentenceStart = 0;
      sentenceOffset = 0;
      sentenceCounter = 0;
      System.out.println("icu");
      while ((sentenceOffset = icuSentenceTokenizer.next()) != icuSentenceTokenizer.DONE) {
          System.out.println(sentenceCounter + " " + testText.substring(sentenceStart, sentenceOffset));
          sentenceStart = sentenceOffset;
          sentenceCounter++;
      }
  }
}

This what I get:

sun
  0 Elle courut à son père et l'embrassa, en l'étreignant
  1 .
  2
   - Eh bien, partons-nous?
  3 dit-elle.
icu
  0 Elle courut à son père et l'embrassa, en l'étreignant.

  1  - Eh bien, partons-nous?
  2 dit-elle.

I did try it with French locale and with other languages and corresponding locales. The presence of followed by causes Sun's break iterator to break the preceding as a sentence apart. Decided to use IBM's ICU4J.

'\n' is left at the beginning of the sentence when using Sun's iterator.

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