org.hibernate.LazyInitializationException，在使用HATEOAS 1.0迁移到Spring Boot 2.2之后>

Question

我有一个带有Spring Data REST，JPA，Hibernate和Spring HATEAOS的Spring Boot 2.1.9应用程序。在迁移到Spring Boot 2.2之前，它运行良好。

我遵循了指南https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.2-Release-Notes，并且遵循了所有步骤。

不幸的是，当我使用这样的REST端点时：

    @PreAuthorize("isAuthenticated()")
    @GetMapping(path = "/tenants/current/subscription")
    public ResponseEntity<?> getCurrentSubscription(PersistentEntityResourceAssembler resourceAssembler) {
        Optional<Subscription> optionalSubscription = tenantService.getCurrentSubscription(TenantContext.getCurrentTenantId());
        if (optionalSubscription.isPresent())
            return ResponseEntity.ok(resourceAssembler.toModel(optionalSubscription.get()));
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }

其中订阅为：

@Entity    
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode(callSuper = true, onlyExplicitlyIncluded = true)
@ToString(callSuper = true)
public class Subscription extends ManagementAbstractEntity {

    @ToString.Exclude
    @NotNull
    @OneToOne(optional = false, fetch = FetchType.LAZY)
    private Tenant tenant;

    //The current plan
    @ToString.Exclude
    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    private Plan currentPlan;

    @NotBlank
    @ColumnDefault(value = "'default'")
    @Column(nullable = false)
    private String group = "default";

    //Expiring date of the subscription
    @NotNull
    @Column(nullable = false)
    private Instant validUntil;

    @Column(nullable = false)
    private Instant trialFrom;

    @Column(nullable = false)
    private Instant trialUntil; 

}

我得到了org.hibernate.LazyInitializationException。这是完整的堆栈跟踪：

19/10/2019 16:29:32,880 ERROR http-nio-8082-exec-8 ApplicationExceptionHandler:158 - 
org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: could not initialize proxy [cloud.test.management.model.plans.Plan#1] - no Session; nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy [cloud.test.management.model.plans.Plan#1] - no Session (through reference chain: org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer$1["embedded"]->org.springframework.data.rest.webmvc.PersistentEntityResource$NoLinksResources["_embedded"]->java.util.Collections$UnmodifiableMap["currentPlan"]->cloud.test.management.model.plans.Plan$HibernateProxy$ldOhcXlB["sid"])
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:296) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:104) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:295) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:226) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.hateoas.server.mvc.RepresentationModelProcessorHandlerMethodReturnValueHandler.handleReturnValue(RepresentationModelProcessorHandlerMethodReturnValueHandler.java:127) ~[spring-hateoas-1.0.0.RELEASE.jar:1.0.0.RELEASE]
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:124) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) [spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:113) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at cloud.test.server.filters.StoreFilter.doFilterInternal(StoreFilter.java:34) [classes/:?]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at com.github.bohnman.squiggly.web.SquigglyRequestFilter.doFilter(SquigglyRequestFilter.java:37) [squiggly-filter-jackson-1.3.18.jar:?]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at cloud.test.server.filters.security.CookieAuthFilter.doFilterInternal(CookieAuthFilter.java:141) [classes/:?]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at cloud.test.server.filters.security.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:152) [classes/:?]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at cloud.test.server.filters.TenantFilter.doFilterInternal(TenantFilter.java:30) [classes/:?]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) [spring-security-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) [spring-boot-actuator-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_181]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_181]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy [cloud.test.management.model.plans.Plan#1] - no Session (through reference chain: org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer$1["embedded"]->org.springframework.data.rest.webmvc.PersistentEntityResource$NoLinksResources["_embedded"]->java.util.Collections$UnmodifiableMap["currentPlan"]->cloud.test.management.model.plans.Plan$HibernateProxy$ldOhcXlB["sid"])
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:394) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:353) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:316) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFieldsFiltered(BeanSerializerBase.java:781) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:164) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.MapProperty.serializeAsField(MapProperty.java:107) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.github.bohnman.squiggly.context.provider.AbstractSquigglyContextProvider.serializeAsIncludedField(AbstractSquigglyContextProvider.java:46) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.github.bohnman.squiggly.filter.SquigglyPropertyFilter.serializeAsField(SquigglyPropertyFilter.java:339) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFilteredFields(MapSerializer.java:883) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:637) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33) ~[jackson-databind-2.10.0.jar:2.10.0]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalResourcesSerializer.serialize(Jackson2HalModule.java:326) ~[spring-hateoas-1.0.0.RELEASE.jar:1.0.0.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalResourcesSerializer.serialize(Jackson2HalModule.java:285) ~[spring-hateoas-1.0.0.RELEASE.jar:1.0.0.RELEASE]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.github.bohnman.squiggly.context.provider.AbstractSquigglyContextProvider.serializeAsIncludedField(AbstractSquigglyContextProvider.java:46) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.github.bohnman.squiggly.filter.SquigglyPropertyFilter.serializeAsField(SquigglyPropertyFilter.java:339) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFieldsFiltered(BeanSerializerBase.java:773) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanSerializer.serialize(UnwrappingBeanSerializer.java:118) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter.serializeAsField(UnwrappingBeanPropertyWriter.java:127) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.github.bohnman.squiggly.context.provider.AbstractSquigglyContextProvider.serializeAsIncludedField(AbstractSquigglyContextProvider.java:46) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.github.bohnman.squiggly.filter.SquigglyPropertyFilter.serializeAsField(SquigglyPropertyFilter.java:339) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFieldsFiltered(BeanSerializerBase.java:773) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:164) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.SerializerProvider.defaultSerializeValue(SerializerProvider.java:1033) ~[jackson-databind-2.10.0.jar:2.10.0]
    at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:206) ~[spring-data-rest-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:154) ~[spring-data-rest-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1433) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:921) ~[jackson-databind-2.10.0.jar:2.10.0]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:287) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    ... 115 more
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy [cloud.test.management.model.plans.Plan#1] - no Session
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:170) ~[hibernate-core-5.4.4.Final.jar:5.4.4.Final]
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:310) ~[hibernate-core-5.4.4.Final.jar:5.4.4.Final]
    at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.intercept(ByteBuddyInterceptor.java:45) ~[hibernate-core-5.4.4.Final.jar:5.4.4.Final]
    at org.hibernate.proxy.ProxyConfiguration$InterceptorDispatcher.intercept(ProxyConfiguration.java:95) ~[hibernate-core-5.4.4.Final.jar:5.4.4.Final]
    at cloud.test.management.model.plans.Plan$HibernateProxy$ldOhcXlB.getSid(Unknown Source) ~[classes/:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:688) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.github.bohnman.squiggly.context.provider.AbstractSquigglyContextProvider.serializeAsIncludedField(AbstractSquigglyContextProvider.java:46) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.github.bohnman.squiggly.filter.SquigglyPropertyFilter.serializeAsField(SquigglyPropertyFilter.java:339) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFieldsFiltered(BeanSerializerBase.java:773) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:164) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ser.std.MapProperty.serializeAsField(MapProperty.java:107) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.github.bohnman.squiggly.context.provider.AbstractSquigglyContextProvider.serializeAsIncludedField(AbstractSquigglyContextProvider.java:46) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at com.github.bohnman.squiggly.filter.SquigglyPropertyFilter.serializeAsField(SquigglyPropertyFilter.java:339) ~[squiggly-filter-jackson-1.3.18.jar:?]
    at 

就像当我尝试获取惰性对象Plan时事务已关闭（我不想急于解决，这不是重点）。我想强调的是，在Spring Boot 2.1.9中，一切正常。

我看不出有什么问题，并且我不想随意更改某些东西以使其起作用。你有什么提示吗？

我有一个带有Spring Data REST，JPA，Hibernate和Spring HATEAOS的Spring Boot 2.1.9应用程序。在迁移到Spring Boot 2.2之前，它运行良好。我遵循了指南https：//github.com/spring -...

Answer 1

有关此问题的任何新闻吗？我正面临着同样的问题。