Not necessarily the most convincing use case, but the following fails,
import org.apache.log4j.*; import org.apache.log4j.helpers.*; import java.text.*; import java.util.*;
public class CDF {protected static FieldPosition pos = new FieldPosition(0);
public static void main(String[] args) throws Exception {SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MMMM-dd HH:mm:ss,SS Z");
CachedDateFormat cdf1 = new CachedDateFormat(sdf1);
StringBuffer buf = new StringBuffer();
Calendar c = Calendar.getInstance();
c.set(2004, Calendar.DECEMBER, 12, 20, 0);
c.set(Calendar.SECOND, 37);
c.set(Calendar.MILLISECOND, 23); cdf1.format(c.getTime(), buf, pos);
System.out.println(buf.toString());
buf.setLength(0); cdf1.format(c.getTime(), buf, pos);
System.out.println(buf.toString());
buf.setLength(0); c.set(2005, Calendar.JANUARY, 1, 0, 0);
c.set(Calendar.SECOND, 13);
c.set(Calendar.MILLISECOND, 905); cdf1.format(c.getTime(), buf, pos);
System.out.println(buf.toString());
buf.setLength(0); cdf1.format(c.getTime(), buf, pos);
System.out.println(buf.toString());} }
It incorrectly outputs
2004-December-12 20:00:37,23 +0100 2004-December-12 20:00:37,023+0100 2005-January-01 00:00:13,905 +0100 2005-January-01 00:00:13,9905+0100
At this moment, I'm too tired to try to fully understand why it fails and how it could be fixed. More tomorrow.
-- Ceki Gülcü
The complete log4j manual: http://qos.ch/log4j/
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