The Slow First Request: Debugging a Jackson `ZonedDateTime` Serializer Cold Path in Spring Boot

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Debug a slow first request in Spring Boot caused by Jackson ZonedDateTime serializer cold path

intermediate Published 21 Jun 2026
Action Steps
  1. Identify the slow request using logging or profiling tools
  2. Configure Jackson to use a custom ZonedDateTime serializer
  3. Implement a caching mechanism to store serialized ZonedDateTime objects
  4. Test the application to verify the fix
  5. Analyze the application's startup time to identify potential cold path issues
Who Needs to Know This

Backend developers and DevOps engineers can benefit from this knowledge to improve the performance of their Spring Boot applications

Key Insight

💡 The first request can be slow due to the cold path of the Jackson ZonedDateTime serializer, which can be optimized using custom serialization and caching

Share This
🚀 Debug slow first requests in Spring Boot by optimizing Jackson ZonedDateTime serializer #SpringBoot #PerformanceOptimization

Key Takeaways

Debug a slow first request in Spring Boot caused by Jackson ZonedDateTime serializer cold path

Full Article

You deploy a Spring Boot service. Most requests are fast. Then one request is mysteriously...
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