从jackson和tomcat库获取错误时，无法处理托管/反向引用“defaultreference”：类型：com.fasterxml.jackson.databind.deser.std.enumdeserializer类型的值反序列化程序在尝试通过post方法保存文件时不支持它们。在我试图保存的实体中没有类型为enum n的变量，在使用空json主体触发post请求时会出现相同的错误。
我使用的是springboot版本2.4.1，jackson库版本2.11.3。
不确定是否有任何错误的代码。请帮助我通过这个问题。
文件.groovy

@Entity
@Table(name = "file", schema = "file_management")
class File {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "file_seq")
    @Column(name = "file_id")
    @SequenceGenerator(sequenceName = "file_id_sequence", name = "file_seq", allocationSize = 1)
    public Integer fileId

    @ManyToOne
    @JoinColumn(name = "file_type_id", nullable = false, updatable = false)
    @JsonBackReference
    FileType fileType

    String name

    String description

    @Column(name = "file_metadata_id")
    Integer fileMetadataId

    @FileExists (message = "error: the file does not exist.")
    @Column(name = "filepath")
    String filepath

    @Column(name = "createdt", insertable = true, updatable = false)
    @CreatedDate
    Date createdt

    @PrePersist
    void onCreate(){
        this.createdt = Calendar.getInstance().getTime()
    }

    @OneToMany(targetEntity = fileRegistrationJobEntity.class, cascade = CascadeType.ALL)
    @JoinColumn(name = "file_id", nullable = true, updatable = true)
    List<FileRegistrationJobEntity> registrationJobs    

}

文件存储库.groovy

@CrossOrigin
@RepositoryRestResource(path="files", itemResourceRel="files")
interface FileRepository extends PagingAndSortingRepository<File, Integer>{

@RestResource(exported=true)
File save (File)

}

错误跟踪：

java.lang.IllegalArgumentException: Cannot handle managed/back reference 'defaultReference': type: value deserializer of type com.fasterxml.jackson.databind.deser.std.EnumDeserializer does not support them
        at com.fasterxml.jackson.databind.JsonDeserializer.findBackReference(JsonDeserializer.java:381) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase._resolveManagedReferenceProperty(BeanDeserializerBase.java:817) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:511) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.DeserializationContext.findNonContextualValueDeserializer(DeserializationContext.java:481) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:497) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.DeserializationContext.findContextualValueDeserializer(DeserializationContext.java:458) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.createContextual(CollectionDeserializer.java:181) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.createContextual(CollectionDeserializer.java:26) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.DeserializationContext.handlePrimaryContextualization(DeserializationContext.java:665) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:508) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:491) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:4713) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4522) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3521) ~[jackson-databind-2.11.3.jar!/:2.11.3]
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:274) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readInternal(AbstractJackson2HttpMessageConverter.java:251) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:199) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.data.rest.webmvc.config.PersistentEntityResourceHandlerMethodArgumentResolver.read(PersistentEntityResourceHandlerMethodArgumentResolver.java:246) ~[spring-data-rest-webmvc-3.4.2.jar!/:3.4.2]
        at org.springframework.data.rest.webmvc.config.PersistentEntityResourceHandlerMethodArgumentResolver.lambda$read$6(PersistentEntityResourceHandlerMethodArgumentResolver.java:202) ~[spring-data-rest-webmvc-3.4.2.jar!/:3.4.2]
        at java.util.Optional.orElseGet(Optional.java:267) ~[?:1.8.0_211]
        at org.springframework.data.rest.webmvc.config.PersistentEntityResourceHandlerMethodArgumentResolver.read(PersistentEntityResourceHandlerMethodArgumentResolver.java:202) ~[spring-data-rest-webmvc-3.4.2.jar!/:3.4.2]
        at org.springframework.data.rest.webmvc.config.PersistentEntityResourceHandlerMethodArgumentResolver.resolveArgument(PersistentEntityResourceHandlerMethodArgumentResolver.java:132) ~[spring-data-rest-webmvc-3.4.2.jar!/:3.4.2]
        at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:170) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) ~[spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1061) [spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:961) [spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.3.2.jar!/:5.3.2]
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) [spring-webmvc-5.3.2.jar!/:5.3.2]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) [tomcat-embed-core-9.0.41.jar!/:4.0.FR]
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.3.2.jar!/:5.3.2]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [tomcat-embed-core-9.0.41.jar!/:4.0.FR]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.2.jar!/:5.3.2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.2.jar!/:5.3.2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) [spring-boot-actuator-2.4.1.jar!/:2.4.1]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.2.jar!/:5.3.2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.2.jar!/:5.3.2]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.2.jar!/:5.3.2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:764) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_211]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_211]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_211]