This upgrade from version 2.10.1 to 2.21.2 spans multiple minor versions and introduces several important changes, including new runtime requirements and behavioral modifications that require verification.

Key Changes:

• Java 8 Baseline Required: Starting with version 2.14, jackson-core requires a Java 8 runtime, and version 2.13 raised the baseline to Java 8 for most other modules like jackson-databind. Applications running on Java 7 will need to be upgraded.
• Removal of JAX-RS 1.x Support: As of version 2.13, support and workarounds for JAX-RS 1.x implementations have been removed. This is a breaking change if your application relies on a JAX-RS 1.x environment.
• Javax vs. Jakarta Namespace: Version 2.13 introduced separate artifacts for javax.* and jakarta.* namespaces. The upgraded artifact jackson-jaxrs-json-provider remains on the javax.* namespace. Ensure this is compatible with your application's dependencies.
• Behavioral Changes to Verify:
  • Date Serialization (v2.11+): The default timezone offset for java.util.Date now includes a colon (e.g., +00:00 instead of +0000).
  • @JsonIgnore Precedence (v2.14+): In cases of conflicting annotations, @JsonIgnore now has higher precedence over @JsonProperty, which could change serialization output.
  • Processing Limits (v2.15+): New default limits on maximum string length, number length, and nesting depth have been introduced to prevent DoS attacks. These may need to be configured for applications processing very large JSON documents.

Recommendation:

Given the change in Java version requirements and multiple behavioral changes, this is a medium-risk upgrade. It is critical to verify that your application runs on Java 8 or newer and is not dependent on JAX-RS 1.x. Thoroughly test serialization and deserialization logic to ensure compatibility with the new behaviors, especially around date formats and edge cases involving @JsonIgnore.

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