Springdoc中JacksonAnnotationIntrospector与@JsonTypeInfo不生效求助

1. 确保自定义ObjectMapper完整包含所有Jackson配置 #

你当前通过Jackson2ObjectMapperBuilder.build()生成的ObjectMapper，可能未显式绑定自定义的JacksonAnnotationIntrospector。需要在构建mapper时，明确注入自定义introspector：

@Bean
public ModelResolver modelResolver(Jackson2ObjectMapperBuilder builder) {
    ObjectMapper mapper = builder.build();
    // 替换为你的自定义AnnotationIntrospector实例
    mapper.setAnnotationIntrospector(new CustomJacksonAnnotationIntrospector());
    // 若@JsonTypeInfo通过mixins配置，确保mixins已正确注册
    // mapper.addMixIn(Money.class, MoneyMixin.class);
    return new ModelResolver(mapper);
}

2. 强制Springdoc复用全局ObjectMapper #

如果项目中已存在配置完整的全局ObjectMapper Bean（包含自定义序列化器、反序列化器、mixins及AnnotationIntrospector），直接注入该Bean到ModelResolver，避免重新构建导致的配置不一致：

@Bean
public ModelResolver modelResolver(ObjectMapper customObjectMapper) {
    return new ModelResolver(customObjectMapper);
}

3. 配置Springdoc的Jackson序列化策略 #

在application.properties中添加配置，强制Springdoc遵循Jackson的注解解析规则：

# 启用Jackson注解全量支持
springdoc.object-mapper-configurer=com.yourpackage.CustomObjectMapperConfigurer

同时实现自定义配置类，统一管理Jackson配置：

@Component
public class CustomObjectMapperConfigurer implements ObjectMapperConfigurer {
    @Override
    public void configure(ObjectMapper objectMapper) {
        objectMapper.setAnnotationIntrospector(new CustomJacksonAnnotationIntrospector());
        objectMapper.registerModule(new CustomMoneyModule()); // 注册自定义序列化/反序列化模块
        objectMapper.addMixIn(Money.class, MoneyMixin.class);
    }
}

4. 验证@JsonTypeInfo配置有效性 #

确认@JsonTypeInfo注解直接标注在Money.class上，或在对应mixins类中正确配置，且ObjectMapper已加载这些mixins。若通过模块注册mixins，需确保模块已被正确注册到ObjectMapper。

5. 保证自定义ModelResolver的优先级 #

用@Primary标记你的自定义ModelResolver Bean，确保Spring优先使用该实例，避免默认ModelResolver覆盖配置：

@Primary
@Bean
public ModelResolver modelResolver(ObjectMapper customObjectMapper) {
    return new ModelResolver(customObjectMapper);
}

内容的提问来源于stack exchange，提问作者mdanish98