The following is a sample code for producing the problem.

--
import java.util.*;

public class T {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance(new Locale("th", "TH"));
        int year = cal.get(cal.YEAR);
        try {
            cal.add(100, +1); // cause exception
        } catch (Exception e) {
        }
        int year2 = cal.get(cal.YEAR);
        if (year2 != year) {
            throw new RuntimeException("wrong year value after exception: got " + year2
                                       + ", expected " + year);
        }
    }
}
--
$ java -showversion T
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b28)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b28, mixed mode)

Exception in thread "main" java.lang.RuntimeException: wrong year value after exception: got 2003, expected 2546
        at T.main(T.java:13)