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The article explains that in Java's SimpleDateFormat the lowercase y pattern (year‑of‑era) should be used for calendar dates, because the uppercase Y pattern represents a week‑based year which can incorrectly roll over to the next year near year‑end, causing bugs.
The article details a senior architect's investigation of Fastjson problems, including a date format priority bug that behaved differently on Windows and Linux due to an outdated library version, and a circular reference serialization issue resolved by disabling specific serializer features, while offering broader insights on version management and feature control.
This article explains how to customize the date format returned by SpringBoot REST controllers using configuration files, Jackson annotations, JavaBean annotations, and global converters, covering both JSON serialization and form data binding with practical code examples.
This article explains why Java's SimpleDateFormat is not thread‑safe, demonstrates the resulting concurrency errors, and presents four practical solutions—including per‑call instantiation, ThreadLocal, Apache FastDateFormat, and Java 8's Instant with DateTimeFormatter—along with JMH benchmark results comparing their performance across JDK 8 and JDK 11.