Machine information, a script to run the test, and source code are attached.
The failure is observed only with compiler2 on sparc.

% y2k_34.ksh
java full version "Solaris_JDK_1.3-b02"
Testing GregorianCalendar add...
Field 0 ok
Field 1 ok
Field 2 ok
Field 3 ok
Field 4 ok
Field 5 ok
Field 6 ok
Field 7 ok
Field 8 ok
Field 9 ok
Field 10 ok
Field 11 ok
Field 12 ok
Field 13 ok
Field 14 ok
Testing GregorianCalendar roll...
Field 0 ok
Field 1 ok
Field 2 ok
Field 3 ok
Field 4 ok
Field 5 ok
Field 6 ok
Field 7 ok
Field 8 ok
Field 9 ok
Field 10 ok
Field 11 ok
Field 12 ok
Field 13 ok
Field 14 ok
0
Testing GregorianCalendar add...
Field 0 ok
Field 1 ok
Field 2 ok
Field 3 ok
Field 4 ok
Field 5 ok
Field 6 ok
Field 7 ok
Field 8 ok
Field 9 ok
Field 10 ok
Field 11 ok
Field 12 ok
Field 13 ok
Field 14 ok
Testing GregorianCalendar roll...
Field 0 ok
Field 1 ok
Field 2 ok
Field 3 ok
Field 4 ok
Field 5 ok
Field 6 ok
Field 7 FAIL, expected 2000/2/15 10:45:15.900, got 1999/4/27 11:45:15.900
Field 8 ok
Field 9 ok
Field 10 ok
Field 11 ok
Field 12 ok
Field 13 ok
Field 14 ok
1

allan.jacobs@Eng 2000-02-16