According to the Unicode LineBreaking Properties doc(http://www.unicode.org/unicode/reports/tr14);
If "GL"(none breaking Glue) categorized chars follow a space character, they still allow a break.

However build 1.4.0beta-b43 were failed with space char, \u1680(Zs category). If GL appends \u1680 it should break at \u1680 but jdk doesn't break.

Try attached "LineBreakTest".

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I:\unicode>java LineBreakTest
10617 unicode chararacters were tested.
6 chars were reported as Glue
test failed

Exception in thread "main" java.lang.RuntimeException: LineBreak.txt reads 'glue
 char' but jdk doesn't:
0F0C(scenario two) with space char, 1680
FEFF(scenario two) with space char, 1680
202F(scenario two) with space char, 1680
2011(scenario two) with space char, 1680
2007(scenario two) with space char, 1680
00A0(scenario two) with space char, 1680

        at LineBreakTest.main(LineBreakTest.java:114)
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bae-chul.kim@eng 2000-12-08
###@###.### 11/2/04 18:28 GMT