ppkarwasz commented on code in PR #3789:
URL: https://github.com/apache/logging-log4j2/pull/3789#discussion_r2197874778
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log4j-core/src/main/java/org/apache/logging/log4j/core/util/internal/instant/InstantPatternLegacyFormatter.java:
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@@ -46,7 +46,10 @@ final class InstantPatternLegacyFormatter implements
InstantPatternFormatter {
private final BiConsumer<StringBuilder, Instant> formatter;
InstantPatternLegacyFormatter(final String pattern, final Locale locale,
final TimeZone timeZone) {
- this.precision = new InstantPatternDynamicFormatter(pattern, locale,
timeZone).getPrecision();
+ // Replaces 'n' used in legacy patterns with 'S' to obtain the right
precision.
+ // In legacy patterns, the precision of 'n' depends on the pattern
length, but
+ // in `DateTimeFormatter`, it is always nanoseconds.
+ this.precision = new
InstantPatternDynamicFormatter(pattern.replace('n', 'S'), locale,
timeZone).getPrecision();
Review Comment:
This is already a (theoretical) issue in `2.x`: patterns that should have a
precision of `MICROSECONDS` are currently classified as `NANOSECONDS`. However,
since `IPLF.getPrecision()` isn’t used anywhere in practice, this
misclassification doesn't cause any actual issues — at least not yet.
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