如何在 Spring 引导中定义自定义对象映射器而不影响 Spring 引导的默认对象映射器？
How to Define a Custom Object Mapper In Spring Boot Without Impacting Default Object Mapper of Spring Boot?
考虑一个 Spring 引导应用程序：
型号Class1
package com.example.demo.model;
public class BigClass {
private Integer id;
private String name;
// Getters Setters are trimmed for brevity
}
型号Class2
package com.example.demo;
public class BigClass {
private Integer id;
private String name;
private Boolean isPresent;
// Getters Setters are trimmed for brevity
}
休息控制器
我正在尝试将一个包含额外成员变量的 "BigClass" 对象映射到另一个包含较少成员变量的 "BigClass" 对象。
@RestController
public class HelloController {
@Autowired
private ObjectMapper objectMapper;
@GetMapping("/hello")
public void sayHello() {
BigClass bg = new BigClass();
bg.setId(1234);
bg.setName("Demo");
bg.setIsPresent(true);
com.example.demo.model.BigClass bigClass =
objectMapper.convertValue(bg, com.example.demo.model.BigClass.class);
}
}
此代码运行良好，因为 Spring 引导默认对象映射器具有 "DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES : disabled"
的规范
但是当我更改 Main class 并添加自定义对象映射器时，如下所示
主要Class
@SpringBootApplication
public class DemoApplication {
@Bean("myCustomBean")
public ObjectMapper customObjectMapper() {
return new ObjectMapper();
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
上面的 Rest Controller 代码停止工作并给出以下错误：
curl "localhost:8081/hello"
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "isPresent" (class com.example.demo.model.BigClass), not marked as ignorable (2 known properties: "id", "name"])
at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: com.example.demo.model.BigClass["isPresent"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:840) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1206) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1592) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1570) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:294) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3917) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:3853) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.example.demo.HelloController.sayHello(HelloController.java:21) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_242]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_242]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_242]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_242]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_242]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_242]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]
我的问题：
- 为什么我的对象映射器 bean（具有唯一的 bean 名称）影响现有默认 spring 引导对象映射器的功能
- 在这种情况下，如果我无法使用默认对象映射器控制遗留代码，我可以选择什么来定义我的自定义对象映射器而不破坏遗留代码。
注意：我无法以任何方式更改遗留代码。
如有任何帮助，我们将不胜感激。
在创建我们自己的ObjectMapper bean时，我们需要配置它的属性
@Bean("myCustomBean")
public ObjectMapper objectMapper() {
return new ObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_NULL)
.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES ,
false);
}
Spring Jackson 自动配置使用 @ConditionalOnMissingBean 创建默认值 ObjectMapper。这意味着它仅在不存在相同类型的现有 bean 时才创建它。因此，通过创建您自己的 ObjectMapper bean，Spring 自动配置不会创建一个。
我想你有几个选择：
- 如果您需要控制默认 Spring
ObjectMapper 的行为，那么您可以使用 spring.jackson.* 属性来配置其行为。
- 如果你真的需要 2 个
ObjectMapper 具有不同行为的对象，你必须将它们都创建为 beans，给它们唯一的名称，并将其中一个标记为 @Primary 以控制 when/where 它们是自动装配的。
在 jackson 的自定义过滤配置项目的自述文件中，我描述了附加 ObjectMapper 的集成。
https://github.com/Antibrumm/jackson-antpathfilter/blob/master/README.md#spring-integration
这比仅仅声明一个 bean 需要更多的工作，但您应该能够调整方法来定义您自己的方法。
诀窍是注册你自己的MappingJackson2HttpMessageConverter
考虑一个 Spring 引导应用程序：
型号Class1
package com.example.demo.model;
public class BigClass {
private Integer id;
private String name;
// Getters Setters are trimmed for brevity
}
型号Class2
package com.example.demo;
public class BigClass {
private Integer id;
private String name;
private Boolean isPresent;
// Getters Setters are trimmed for brevity
}
休息控制器
我正在尝试将一个包含额外成员变量的 "BigClass" 对象映射到另一个包含较少成员变量的 "BigClass" 对象。
@RestController
public class HelloController {
@Autowired
private ObjectMapper objectMapper;
@GetMapping("/hello")
public void sayHello() {
BigClass bg = new BigClass();
bg.setId(1234);
bg.setName("Demo");
bg.setIsPresent(true);
com.example.demo.model.BigClass bigClass =
objectMapper.convertValue(bg, com.example.demo.model.BigClass.class);
}
}
此代码运行良好，因为 Spring 引导默认对象映射器具有 "DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES : disabled"
的规范但是当我更改 Main class 并添加自定义对象映射器时，如下所示
主要Class
@SpringBootApplication
public class DemoApplication {
@Bean("myCustomBean")
public ObjectMapper customObjectMapper() {
return new ObjectMapper();
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
上面的 Rest Controller 代码停止工作并给出以下错误：
curl "localhost:8081/hello"
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "isPresent" (class com.example.demo.model.BigClass), not marked as ignorable (2 known properties: "id", "name"])
at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: com.example.demo.model.BigClass["isPresent"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:840) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1206) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1592) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1570) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:294) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3917) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:3853) ~[jackson-databind-2.10.2.jar:2.10.2]
at com.example.demo.HelloController.sayHello(HelloController.java:21) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_242]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_242]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_242]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_242]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_242]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_242]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]
我的问题：
- 为什么我的对象映射器 bean（具有唯一的 bean 名称）影响现有默认 spring 引导对象映射器的功能
- 在这种情况下，如果我无法使用默认对象映射器控制遗留代码，我可以选择什么来定义我的自定义对象映射器而不破坏遗留代码。 注意：我无法以任何方式更改遗留代码。
如有任何帮助，我们将不胜感激。
在创建我们自己的ObjectMapper bean时，我们需要配置它的属性
@Bean("myCustomBean")
public ObjectMapper objectMapper() {
return new ObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_NULL)
.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES ,
false);
}
Spring Jackson 自动配置使用 @ConditionalOnMissingBean 创建默认值 ObjectMapper。这意味着它仅在不存在相同类型的现有 bean 时才创建它。因此，通过创建您自己的 ObjectMapper bean，Spring 自动配置不会创建一个。
我想你有几个选择：
- 如果您需要控制默认 Spring
ObjectMapper的行为，那么您可以使用spring.jackson.*属性来配置其行为。 - 如果你真的需要 2 个
ObjectMapper具有不同行为的对象，你必须将它们都创建为 beans，给它们唯一的名称，并将其中一个标记为@Primary以控制 when/where 它们是自动装配的。
在 jackson 的自定义过滤配置项目的自述文件中，我描述了附加 ObjectMapper 的集成。
https://github.com/Antibrumm/jackson-antpathfilter/blob/master/README.md#spring-integration
这比仅仅声明一个 bean 需要更多的工作，但您应该能够调整方法来定义您自己的方法。
诀窍是注册你自己的MappingJackson2HttpMessageConverter