java - 更新到 Spring Boot 2 后 Jackson 模块未注册

Question

我正在从 Spring Boot 1.5.21 升级到 2.2.5。

我需要使用 MonetaryModule反序列化休息调用，并取决于 Spring 的 ObjectMapper .

我在一些 @Configuration 中为这个模块定义了这样一个 bean。类( MonetaryModule 正在扩展 Module ):

@Bean
public MonetaryModule monetaryModule() {
    return new MonetaryModule();
}

我可以在 /beans 中看到它创建的端点。但是，它实际上并没有加载到 ObjectMapper .经过大量调试和挖掘Spring的代码，我得出的结论是 JacksonAutoConfiguration有问题。 .它有一个名为 JacksonObjectMapperBuilderConfiguration 的内部静态类里面有一个 bean创建 Jackson2ObjectMapperBuilder .在创建过程中，调用了 customize()最终得到这个代码:

private void configureModules(Jackson2ObjectMapperBuilder builder) {
    Collection<Module> moduleBeans = getBeans(this.applicationContext, Module.class);
    builder.modulesToInstall(moduleBeans.toArray(new Module[0]));
}

这段代码似乎负责将模块加载到 ObjectMapper , 问题是这个 Jackson2ObjectMapperBuilder实际上并没有创建。它出现在 /beans端点，但事实上当我在那里断点时我没有达到断点。这解释了为什么模块没有加载到 ObjectMapper 中。 .

问题是，为什么不调用此代码？为什么 /bean表示bean确实存在？

编辑 - 添加条件评估报告:

============================
CONDITIONS EVALUATION REPORT
============================


Positive matches:
-----------------

   AopAutoConfiguration matched:
      - @ConditionalOnProperty (spring.aop.auto=true) matched (OnPropertyCondition)

   AopAutoConfiguration.AspectJAutoProxyingConfiguration matched:
      - @ConditionalOnClass found required class 'org.aspectj.weaver.Advice' (OnClassCondition)

   AopAutoConfiguration.AspectJAutoProxyingConfiguration.CglibAutoProxyConfiguration matched:
      - @ConditionalOnProperty (spring.aop.proxy-target-class=true) matched (OnPropertyCondition)

   ConfigServiceBootstrapConfiguration#configServicePropertySource matched:
      - @ConditionalOnProperty (spring.cloud.config.enabled) matched (OnPropertyCondition)
      - @ConditionalOnMissingBean (types: org.springframework.cloud.config.client.ConfigServicePropertySourceLocator; SearchStrategy: all) did not find any beans (OnBeanCondition)

   ConfigServiceBootstrapConfiguration.RetryConfiguration matched:
      - @ConditionalOnClass found required classes 'org.springframework.retry.annotation.Retryable', 'org.aspectj.lang.annotation.Aspect', 'org.springframework.boot.autoconfigure.aop.AopAutoConfiguration' (OnClassCondition)
      - @ConditionalOnProperty (spring.cloud.config.fail-fast) matched (OnPropertyCondition)

   ConfigServiceBootstrapConfiguration.RetryConfiguration#configServerRetryInterceptor matched:
      - @ConditionalOnMissingBean (names: configServerRetryInterceptor; SearchStrategy: all) did not find any beans (OnBeanCondition)

   ConfigurationPropertiesRebinderAutoConfiguration matched:
      - @ConditionalOnBean (types: org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor; SearchStrategy: all) found bean 'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor' (OnBeanCondition)

   ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesBeans matched:
      - @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesBeans; SearchStrategy: current) did not find any beans (OnBeanCondition)

   ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesRebinder matched:
      - @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesRebinder; SearchStrategy: current) did not find any beans (OnBeanCondition)

   EncryptionBootstrapConfiguration matched:
      - @ConditionalOnClass found required class 'org.springframework.security.crypto.encrypt.TextEncryptor' (OnClassCondition)

   PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer matched:
      - @ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) did not find any beans (OnBeanCondition)


Negative matches:
-----------------

   AopAutoConfiguration.AspectJAutoProxyingConfiguration.JdkDynamicAutoProxyConfiguration:
      Did not match:
         - @ConditionalOnProperty (spring.aop.proxy-target-class=false) did not find property 'proxy-target-class' (OnPropertyCondition)

   AopAutoConfiguration.ClassProxyingConfiguration:
      Did not match:
         - @ConditionalOnMissingClass found unwanted class 'org.aspectj.weaver.Advice' (OnClassCondition)

   DiscoveryClientConfigServiceBootstrapConfiguration:
      Did not match:
         - @ConditionalOnProperty (spring.cloud.config.discovery.enabled) did not find property 'spring.cloud.config.discovery.enabled' (OnPropertyCondition)

   EncryptionBootstrapConfiguration.RsaEncryptionConfiguration:
      Did not match:
         - Keystore nor key found in Environment (EncryptionBootstrapConfiguration.KeyCondition)
      Matched:
         - @ConditionalOnClass found required class 'org.springframework.security.rsa.crypto.RsaSecretEncryptor' (OnClassCondition)

   EncryptionBootstrapConfiguration.VanillaEncryptionConfiguration:
      Did not match:
         - @ConditionalOnMissingClass found unwanted class 'org.springframework.security.rsa.crypto.RsaSecretEncryptor' (OnClassCondition)


Exclusions:
-----------

    None


Unconditional classes:
----------------------

    None

另外，附上 /conditions 的输出。 & /beans端点输出(太大而无法粘贴到帖子本身)

endpoints output

Answer 1

您的状况评估报告显示以下内容:

        "JacksonAutoConfiguration.JacksonObjectMapperConfiguration#jacksonObjectMapper": {
          "notMatched": [
            {
              "condition": "OnBeanCondition",
              "message": "@ConditionalOnMissingBean (types: com.fasterxml.jackson.databind.ObjectMapper; SearchStrategy: all) found beans of type 'com.fasterxml.jackson.databind.ObjectMapper' jacksonBuilder"
            }
          ],
          "matched": []
        },

这意味着 Spring Boot 自动配置条件正在退出，因为您的应用程序已经就此事提供了意见:已经有 ObjectMapper bean 命名 jacksonBuilder ;它由您正在使用的库中的应用程序或某些配置类提供。

在这种情况下，这来自配置类，正如 bean 端点所指出的:

        "jacksonBuilder": {
          "aliases": [],
          "scope": "singleton",
          "type": "com.fasterxml.jackson.databind.ObjectMapper",
          "resource": "class path resource [com/behalf/core/authorization_domain/config/AuthorizationDomainConfiguration.class]",
          "dependencies": []
        },

您应该在这里与 AuthorizationDomainConfiguration 的维护者取得联系。并让他们知道他们应该避免覆盖应用程序对 JSON(反)序列化的意见。