--debug 条件报告:为什么这个 Bean 没生效

  不加参数:输出里有 "CONDITIONS EVALUATION REPORT" = False,输出共 3 行
  --debug:输出里有 "CONDITIONS EVALUATION REPORT" = True,输出共 283 行
  -Ddebug=true:输出里有报告 = True
  只调高 logging.level.org.springframework.boot.autoconfigure.logging=DEBUG:输出里有报告 = True

  Positive matches:23 项
  Negative matches:37 项
  Exclusions:0 项
  Unconditional classes:0 项

  [Positive matches] JacksonAutoConfiguration#jacksonJsonMapper:
       JacksonAutoConfiguration#jacksonJsonMapper matched:
          - @ConditionalOnMissingBean (types: tools.jackson.databind.json.JsonMapper; SearchStrategy: all) did not find any beans (OnBeanCondition)
  [Negative matches] WebMvcAutoConfiguration:
       WebMvcAutoConfiguration:
          Did not match:
             - not a servlet web application (OnWebApplicationCondition)
          Matched:
             - @ConditionalOnClass found required classes 'jakarta.servlet.Servlet', 'org.springframework.web.servlet.DispatcherServlet', 'org.springframework.web.servlet.config.annotation.WebMvcConfigure
  [Negative matches] MessageSourceAutoConfiguration:
       MessageSourceAutoConfiguration:
          Did not match:
             - ResourceBundle did not find bundle with basename messages (MessageSourceAutoConfiguration.ResourceBundleCondition)
  [Negative matches] ProjectInfoAutoConfiguration#buildProperties:
       ProjectInfoAutoConfiguration#buildProperties:
          Did not match:
             - @ConditionalOnResource did not find resource '${spring.info.build.location:classpath:META-INF/build-info.properties}' (OnResourceCondition)
  [Negative matches] Main#myMapper:
       Main#myMapper:
          Did not match:
             - @ConditionalOnProperty (user.mapper) did not find property 'user.mapper' (OnPropertyCondition)

  用户没定义 → [Positive matches]
       JacksonAutoConfiguration#jacksonJsonMapper matched:
          - @ConditionalOnMissingBean (types: tools.jackson.databind.json.JsonMapper; SearchStrategy: all) did not find any beans (OnBeanCondition)
       JacksonAutoConfiguration#jsonMapperBuilder matched:
  用户定义了 myMapper → [Negative matches]
       JacksonAutoConfiguration#jacksonJsonMapper:
          Did not match:
             - @ConditionalOnMissingBean (types: tools.jackson.databind.json.JsonMapper; SearchStrategy: all) found beans of type 'tools.jackson.databind.json.JsonMapper' myMapper (OnBeanCondition)

  不加 --debug:3 次进程总用时(ms)[649, 629, 640]
  --debug:3 次进程总用时(ms)[612, 618, 628]