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Title: Fix memory leak in SpotifyApi via Unmanaged ThreadLocal (Resolves #450) by QiuYucheng2003 · Pull Request #451 · spotify-web-api-java/spotify-web-api-java · GitHub

Open Graph Title: Fix memory leak in SpotifyApi via Unmanaged ThreadLocal (Resolves #450) by QiuYucheng2003 · Pull Request #451 · spotify-web-api-java/spotify-web-api-java

X Title: Fix memory leak in SpotifyApi via Unmanaged ThreadLocal (Resolves #450) by QiuYucheng2003 · Pull Request #451 · spotify-web-api-java/spotify-web-api-java

Description: Fixes #450 Description In high-concurrency environments or when using long-lived thread pools (e.g., Spring Boot default executors, Tomcat), the ThreadLocal used for SIMPLE_DATE_FORMAT acts as an Unmanaged ThreadLocal (UTL). Because ThreadLocal.remove() is never invoked, it retains instances indefinitely in the thread's ThreadLocalMap, leading to memory leaks over time. Changes Made Replaced ThreadLocal with Java 8's java.time.format.DateTimeFormatter. Since DateTimeFormatter is inherently thread-safe and immutable, it completely eliminates the need for thread-local storage while keeping the exact same formatting rules. Ensured Backward Compatibility: The legacy SimpleDateFormat was lenient and would quietly ignore trailing characters (like Z or milliseconds .750Z) after reaching the 19-character pattern limit. DateTimeFormatter is strictly validated. To preserve absolute backward compatibility and avoid breaking existing integrations, parseDefaultDate now safely truncates the input string to 19 characters before parsing. Wrapped DateTimeParseException into the legacy ParseException so existing catch blocks in user code will not break. All 338 unit tests pass successfully. Pull request ready for review!

Open Graph Description: Fixes #450 Description In high-concurrency environments or when using long-lived thread pools (e.g., Spring Boot default executors, Tomcat), the ThreadLocal<SimpleDateFormat> used for SIMPLE_...

X Description: Fixes #450 Description In high-concurrency environments or when using long-lived thread pools (e.g., Spring Boot default executors, Tomcat), the ThreadLocal&lt;SimpleDateFormat&gt; used for...

Opengraph URL: https://github.com/spotify-web-api-java/spotify-web-api-java/pull/451

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ffe93e3 Address code review suggestions for date parsing QiuYucheng2003 Feb 21, 2026 https://github.com/spotify-web-api-java/spotify-web-api-java/pull/451/commits/ffe93e3026690811d74e1722cb6807b1244b578e
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