v10.0.1

2026 June Security release

Changed

• setDefaultUser and clearDefaultUser methods are not blocked after client closure

v10.0.0

This release focuses on networking-related improvements. Upgrading is highly recommended if you occasionally see HTTP errors or timeouts in the SDK's log.

Improvements:

• Implement logic to retry failed HTTP requests one time (on receiving unexpected status code, timeout or request error).
• Add debug logging to ConfigFetcher.
• Log the CF-RAY header also when the headers are received, but downloading the response body times out or fails.

Breaking changes:

• The option to set a custom OkHttpClient was removed. Instead, a new HttpOptions was added to control HTTP Client timeouts and HTTP proxy configuration.

v9.4.4

Changed

• Only consider the HTTP status code 200 as an indication of success. We won't try to process the HTTP response body otherwise.

Added

• Check for empty/invalid HTTP response body to report meaningful errors instead of null pointer exceptions during deserialization.

v9.4.3

Changed

• Publish using the new Maven Central publishing API.

v9.4.2

Improvements

• Added HTTP response CF-RAY header value to ConfigFetcher logs
• Updated Auto poll correction time

v9.4.1

• 2024 August security release

v9.4.0

Improvements

• Optimize log message formatting.

Breaking Changes

• Changed LogFilterFunction.apply() method message parameter type to Object. The formatted message String can be obtained by calling toString. (It is guaranteed that the message string is built only once even if toString called multiple times.)

v9.3.0

Improvements

• Refine SDK locking mechanism
• Add new logFilter(LogFilterFunction) to the client customization options. The LogFilterFunction interface allows a custom log filtering implementation.

v9.2.0

Improvements / Changes

• Deprecated addOnClientReady(Runnable callback) hook and added a new version addOnClientReady(Consumer<ClientCacheState> callback)
• ConfigCatHooks synchronization replaced with ReentrantReadWriteLock
• Added waitForReadyAsync method to client
• ConfigCat User object methods visibility fixed.

v9.1.2

Fixed

• Initial config JSON load when auto poll enabled with results from cache.