在 Spring MVC 项目中使用带有自定义消息转换器的 springdoc

【问题标题】：Use springdoc in Spring MVC project with custom message converters在 Spring MVC 项目中使用带有自定义消息转换器的 springdoc
【发布时间】：2021-03-25 04:32:54
【问题描述】：

将 springdoc 添加到现有 Spring MVC REST API 项目会导致自定义消息转换器出现问题。该项目配置自定义消息转换器以将日期输出设置为特定格式并删除包含null 的字段。这是使用 @Configuration 注释类完成的，该类扩展 WebMvcConfigurationSupport，覆盖 configureMessageConverters 并添加自定义转换器以及默认转换器 (addDefaultHttpMessageConverters)。

为了将 springdoc（1.5.1 版）添加到项目中，我遵循了 here 的说明，只是注册了 org.springdoc.webmvc.ui.SwaggerConfig.class 而不是列出的 org.springdoc.ui.SwaggerConfig.class，因为后者不存在。 这需要添加@EnableWebMvc 注释，而这又需要实现WebMvcConfigurer 而不是扩展WebMvcConfigurationSupport。通过使用WebMvcConfigurer，我无法添加默认转换器，仅使用自定义转换器，springdoc JSON 被转义，因此无效。如果不添加@EnableWebMvc 注解，则swagger-ui.html 页面不可用。

我想使用@EnableWebMvc，实现WebMvcConfigurer 并使用自定义转换器，但通过以某种方式或通过其他方式添加默认转换器来防止springdoc JSON 的转义。或者我想使用“旧”配置，因此扩展 WebMvcConfigurationSupport 而不是添加 @EnableWebMvc 注释，但以某种方式使 swagger-ui.html 页面可访问。

我怎样才能实现这些选项？

编辑 1

配置类已经使用@EnableWebMvc注解并实现WebMvcConfigurer，这样就可以到达swagger-ui.html页面了。转换器使用以下方法定制：

@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
  List<MediaType> supportedMediaTypes = new ArrayList<>();
  supportedMediaTypes.add(MediaType.APPLICATION_JSON);

  for (HttpMessageConverter<?> converter : converters) {
    if (converter instanceof MappingJackson2HttpMessageConverter) {
      MappingJackson2HttpMessageConverter jsonMessageConverter = (MappingJackson2HttpMessageConverter) converter;
      ObjectMapper objectMapper = jsonMessageConverter.getObjectMapper();
      objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
      objectMapper.setTimeZone(TimeZone.getTimeZone(timeZone));
      jsonMessageConverter.setSupportedMediaTypes(supportedMediaTypes);
      break;
    }
  }
}

此解决方案基于the accepted answer here。

这样，所有来自端点的 JSON 响应都被配置为不省略 null 字段并使用配置的时区，springdoc JSON 也不会被转义。

我尝试配置 MappingJackson2HttpMessageConverter bean 并将其添加到转换器列表中，但是 springdoc JSON 被转义使其无效。

@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
  converters.add(customJsonConverter());
  // It's possible to add a converter at a specific index, that to doesn't
  // prevent the springdoc JSON from being escaped.
  // converters.add(1, customJsonConverter());
}

编辑 2

有了第一次编辑中提到的更改，一切似乎都运行良好。使用 Tomcat 7。但是，应用程序将使用 Tomcat 9 进行部署，这会导致（有点难以描述）错误。

[2020-12-15 04:41:42,964] Artifact <artifact-name>:war: Artifact is being deployed, please wait...
15-Dec-2020 16:41:51.791 INFO [RMI TCP Connection(2)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
15-Dec-2020 16:41:52.187 SEVERE [RMI TCP Connection(2)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method [manageApp]
    java.lang.IllegalStateException: Error starting child
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
        at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1727)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:288)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:288)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
        at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
        at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
        at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
        at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/<application-context>]]
        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
        ... 43 more
    Caused by: java.lang.ExceptionInInitializerError
        at org.springframework.boot.logging.LoggingSystemFactory.lambda$fromSpringFactories$0(LoggingSystemFactory.java:44)
        at org.springframework.boot.logging.DelegatingLoggingSystemFactory.getLoggingSystem(DelegatingLoggingSystemFactory.java:41)
        at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:159)
        at org.springframework.boot.logging.log4j2.SpringBootConfigurationFactory.getConfiguration(SpringBootConfigurationFactory.java:60)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:453)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:385)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:238)
        at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:158)
        at org.apache.logging.log4j.web.Log4jWebInitializerImpl.initializeNonJndi(Log4jWebInitializerImpl.java:174)
        at org.apache.logging.log4j.web.Log4jWebInitializerImpl.start(Log4jWebInitializerImpl.java:112)
        at org.apache.logging.log4j.web.Log4jServletContainerInitializer.onStartup(Log4jServletContainerInitializer.java:57)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        ... 44 more
    Caused by: java.lang.NullPointerException
        at org.springframework.core.io.support.SpringFactoriesLoader.loadSpringFactories(SpringFactoriesLoader.java:126)
        at org.springframework.core.io.support.SpringFactoriesLoader.loadFactoryNames(SpringFactoriesLoader.java:122)
        at org.springframework.core.io.support.SpringFactoriesLoader.loadFactories(SpringFactoriesLoader.java:98)
        at org.springframework.boot.logging.LoggingSystemFactory.lambda$fromSpringFactories$0(LoggingSystemFactory.java:44)
        at org.springframework.boot.logging.DelegatingLoggingSystemFactory.getLoggingSystem(DelegatingLoggingSystemFactory.java:41)
        at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:159)
        at org.springframework.boot.logging.log4j2.SpringBootConfigurationFactory.getConfiguration(SpringBootConfigurationFactory.java:60)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:453)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:385)
        at org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(ConfigurationFactory.java:260)
        at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:615)
        at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:636)
        at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:231)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
        at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
        at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:121)
        at org.apache.logging.log4j.jcl.LogAdapter.getContext(LogAdapter.java:39)
        at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
        at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:40)
        at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:55)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685)
        at org.springframework.core.io.support.SpringFactoriesLoader.<clinit>(SpringFactoriesLoader.java:71)
        ... 57 more
15-Dec-2020 16:41:52.189 SEVERE [RMI TCP Connection(2)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method [createStandardContext]
    javax.management.RuntimeOperationsException: Exception invoking method [manageApp]
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:288)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
        at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
        at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
        at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
        at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: java.lang.IllegalStateException: Error starting child
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
        at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1727)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:288)
        ... 35 more
    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/<application-context>]]
        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
        ... 43 more
    Caused by: java.lang.ExceptionInInitializerError
        at org.springframework.boot.logging.LoggingSystemFactory.lambda$fromSpringFactories$0(LoggingSystemFactory.java:44)
        at org.springframework.boot.logging.DelegatingLoggingSystemFactory.getLoggingSystem(DelegatingLoggingSystemFactory.java:41)
        at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:159)
        at org.springframework.boot.logging.log4j2.SpringBootConfigurationFactory.getConfiguration(SpringBootConfigurationFactory.java:60)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:453)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:385)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:238)
        at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:158)
        at org.apache.logging.log4j.web.Log4jWebInitializerImpl.initializeNonJndi(Log4jWebInitializerImpl.java:174)
        at org.apache.logging.log4j.web.Log4jWebInitializerImpl.start(Log4jWebInitializerImpl.java:112)
        at org.apache.logging.log4j.web.Log4jServletContainerInitializer.onStartup(Log4jServletContainerInitializer.java:57)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5128)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        ... 44 more
    Caused by: java.lang.NullPointerException
        at org.springframework.core.io.support.SpringFactoriesLoader.loadSpringFactories(SpringFactoriesLoader.java:126)
        at org.springframework.core.io.support.SpringFactoriesLoader.loadFactoryNames(SpringFactoriesLoader.java:122)
        at org.springframework.core.io.support.SpringFactoriesLoader.loadFactories(SpringFactoriesLoader.java:98)
        at org.springframework.boot.logging.LoggingSystemFactory.lambda$fromSpringFactories$0(LoggingSystemFactory.java:44)
        at org.springframework.boot.logging.DelegatingLoggingSystemFactory.getLoggingSystem(DelegatingLoggingSystemFactory.java:41)
        at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:159)
        at org.springframework.boot.logging.log4j2.SpringBootConfigurationFactory.getConfiguration(SpringBootConfigurationFactory.java:60)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:453)
        at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:385)
        at org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(ConfigurationFactory.java:260)
        at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:615)
        at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:636)
        at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:231)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
        at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
        at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
        at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:121)
        at org.apache.logging.log4j.jcl.LogAdapter.getContext(LogAdapter.java:39)
        at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
        at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:40)
        at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:55)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685)
        at org.springframework.core.io.support.SpringFactoriesLoader.<clinit>(SpringFactoriesLoader.java:71)
        ... 57 more
[2020-12-15 04:41:52,197] Artifact <artifact-name>:war: Error during artifact deployment. See server log for details.
15-Dec-2020 16:41:52.702 INFO [Catalina-utility-2] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Users/dopheidp/Programs/apache-tomcat-9.0.37/webapps/manager]
15-Dec-2020 16:41:52.775 INFO [Catalina-utility-2] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
15-Dec-2020 16:41:52.794 INFO [Catalina-utility-2] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Users/dopheidp/Programs/apache-tomcat-9.0.37/webapps/manager] has finished in [92] ms

为了安全起见，工件名称和应用程序上下文已分别替换为 和 。

Tomcat 9下的异常似乎是项目中添加了springdoc和/或Spring Boot依赖引起的。通过将 springdoc 从版本 1.5.1 降级到 1.4.8 并将 Spring Boot 从 2.4.0 降级到 2.3.5.RELEASE 在 Tomcat 9（和 Tomcat 7）下一切正常。

【问题讨论】：

    标签： java spring spring-mvc springdoc springdoc-openapi-ui


    【解决方案1】：

    已使用the sprindoc website 中的说明将 Springdoc 添加到 Spring MVC 项目中。这意味着添加@EnableWebMvc 注释并将扩展 WebMvcConfigurationSupport 的配置类更改为实现 WebMvcConfigurer。所以

    public class WebMvcConfig extends WebMvcConfigurationSupport { ... }

    变成

    @EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurationSupport { ... }

    这些更改会导致用于全局配置 JSON 响应的消息转换器中断。为了解决这个问题，删除了以前用于配置消息转换器的方法。

    @Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
  converters.add(jsonConverter());
  addDefaultHttpMessageConverters(converters);
}

@Bean
public MappingJackson2HttpMessageConverter jsonConverter() {
  List<MediaType> supportedMediaTypes = new ArrayList<>();
  supportedMediaTypes.add(MediaType.APPLICATION_JSON);

  Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
  builder.serializationInclusion(JsonInclude.Include.NON_NULL);
  builder.timeZone(TimeZone.getTimeZone(timeZone));

  MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter(builder.build());
  jsonConverter.setSupportedMediaTypes(supportedMediaTypes);
  return jsonConverter;
}

    并用下面的方法代替。其他配置消息转换器的方法似乎不起作用，请参阅已尝试的配置变体的问题。

    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
  for (HttpMessageConverter<?> converter : converters) {
    if (converter instanceof MappingJackson2HttpMessageConverter) {
      MappingJackson2HttpMessageConverter jsonMessageConverter = (MappingJackson2HttpMessageConverter) converter;
      ObjectMapper objectMapper = jsonMessageConverter.getObjectMapper();
      objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
      objectMapper.setTimeZone(TimeZone.getTimeZone(timeZone));
      jsonMessageConverter.setSupportedMediaTypes(supportedMediaTypes);
      break;
    }
  }
}

    项目目前使用springdoc版本1.4.8和Spring Boot版本2.3.5.RELEASE作为依赖，使用最新可用版本springdoc1.5.1和Spring Boot2.4.0写这篇文章，导致Tomcat 9下异常阻止项目启动。

    【讨论】：

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