Web Reference: Learn common pitfalls and solutions for issues with boolean fields in Java, including code examples and debugging tips. Jan 2, 2026 · Boolean Field Becomes null in Spring Boot DTO? Here’s Why (And How to Fix It) # beginners # java # springboot # backend If you’re building REST APIs using Spring Boot, you may encounter a strange and frustrating issue: The request JSON clearly sends a boolean value (true / false), but inside the DTO, the value becomes null. No exception. Aug 28, 2015 · I recently ran into this issue and this is what I found. Jackson will inspect any class that you pass to it for getters and setters, and use those methods for serialization and deserialization.
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