[BUG] If configuration file initialization fails, the configuration file remains uninitialized indefinitely

Is there an existing issue for this?

• I have searched the existing issues

SDK Version

3.2.0-alpha to 4.2.2.
Since this commit: Update HttpProjectConfigManager to use Last-Modified time (https://github.com/optimizely/java-sdk/pull/292)

Current Behavior

If the initialization of the configuration file fails, the configuration file remains un-initilialized indefinitely until the server/pod is restarted, or the configuration gets updated on Optimizely platform.

Expected Behavior

If the configuration file cannot be initialized at server start-up (eg: because Optimizely is down or takes to much time to respond), then during the next configuration poll, the configuration should be updated, even if Optimizely returns an HTTP 304 (Not Modified) code.

Steps To Reproduce

• At initialization of the PollingProjectConfigManager the connection is broken, or there is a time out, or an error. => PollingProjectConfigManager.currentProjectConfig is empty.
• 5min later, PollingProjectConfigManager.poll() polls the config file, but receives HTTP 304 from Optimizely => PollingProjectConfigManager.currentProjectConfig remains empty.
• 5min later, still no modification on the configuration => PollingProjectConfigManager.currentProjectConfig remains empty.
• PollingProjectConfigManager.currentProjectConfig is never initialized (except if a modification on the configuration is done on Optimizely side, or the server is restarted).

Java Version

No response

Link

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Logs

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Severity

Affecting users

Workaround/Solution

See the HttpProjectConfigManager:
https://github.com/optimizely/java-sdk/blob/746e81530a9224fabcd7f610d81800358e6e34c9/core-httpclient-impl/src/main/java/com/optimizely/ab/config/HttpProjectConfigManager.java#L95-L121

Here, the condition handling the HttpStatus.SC_NOT_MODIFIED should check if the currentProjectConfig is initialized or not. If it is empty, it means the configuration file has never been initialized properly and the configuration should thus be returned.

Recent Change

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Conflicts

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Bắt đầu trong core-httpclient-impl/src/main/java/com/optimizely/ab/config/HttpProjectConfigManager.java, đặc biệt là phần xử lý HttpStatus.SC_NOT_MODIFIED quanh các dòng 95–121. Theo dõi cách PollingProjectConfigManager khởi tạo và polling currentProjectConfig sau HTTP 304. Hoàn thành khi một lần khởi động thất bại vẫn có thể khởi tạo cấu hình trong một lần polling sau đó, ngay cả khi phản hồi là 304.