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    <title>版本升级 on 知识铺的博客</title>
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      <title>Spring Boot 4.0 升级 Jackson 3 后，包名、API 和配置到底怎么改</title>
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      <description>Spring Boot 4.0（2025年11月 GA）将默认 JSON 处理库从 Jackson 2 升级为 Jackson 3，这是本次大版本升级中影响面最广的破坏性变更之一。所有依赖 ObjectMapper、注解和序列化器的代码都将面临编译失败，需要系统性重构。 Jackson 3 不再延续 Jackson 2 的 com.fasterxml.jackson 包路径，而是拆分为多个独立模块并采用新命名空间。核心包从 com.fasterxml.jackson.core</description>
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