This upgrade of the Jackson suite from version 2.10.1 to 2.21.2 is a high-risk change. It spans multiple minor versions and introduces several significant changes, including a raised Java version requirement, new processing limits for security, and behavioral modifications that require developer action and verification.

Key Breaking Changes:

• Java 8 Baseline Required: Jackson 2.13 and later require Java 8 for most modules, including jackson-databind and jackson-core. [1, 3, 7] Projects running on older Java versions must upgrade their environment.

• Javax to Jakarta Namespace Migration: The jackson-jaxrs-json-provider has been updated for Jakarta EE. If your project uses JAX-RS with Jakarta, you will need to update your dependencies from the old javax.* artifacts to the new jakarta.* artifacts. [3, 4, 9] Additionally, workarounds for the older JAX-RS 1.x were removed in version 2.13. [3, 9]

• New Processing Limits: To mitigate Denial of Service (DoS) risks, version 2.15 introduced default limits on input size. [5, 6, 10] This includes maximums for string length, number length, and document nesting depth. Applications that process very large JSON documents may encounter StreamConstraintsException and will require configuration adjustments on the JsonFactory.

• Behavioral Changes:

  • Annotation Precedence: In version 2.14, the handling of conflicting @JsonIgnore and @JsonProperty annotations changed. @JsonIgnore now has higher precedence, which could alter serialization output. [2, 19]
  • Record Deserialization: The mechanism for deserializing Java Records was modified in version 2.15 to align with POJOs, which could break deserialization for code relying on the previous field-based behavior. [14]

Recommendation:

Given the number of impactful changes, thorough testing is essential. Developers should:

1. Verify the project is running on Java 8 or newer.
2. Update build configurations to use the new jakarta artifacts for JAX-RS if applicable.
3. Test applications that handle large JSON inputs to ensure they do not exceed the new default processing limits.
4. Review models that use mixed @JsonIgnore/@JsonProperty annotations or Java Records for any unexpected serialization or deserialization behavior.

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