{“ timestamp”：“ 2019-11-18T08：40：13.977 + 0000”，“状态”：500，“错误”：“内部服务器错误”，“ message”：“无法编写JSON：找不到类型类com.gk.promo.models.location.Location！的PersistentEntity；嵌套异常为com.fasterxml.jackson.databind.JsonMappingException：找不到PersistentEntity用于键入类com.gk.promo.models.location.Location！（通过参考链：org.springframework.hateoas.PagedResources [\“ _ embedded \”]-> java.util.Collections $ UnmodifiableMap [\“ promotion \”]- > java.util.ArrayList [0]-> org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module $ PersistentEntityResourceSerializer $ 1 [\“ content \”]-> com.gk.promo.models.promotion.Promotion [\“位置\”]）”，“ trace”：“ org.springframework.http.converter.HttpMessageNotWritableException：无法编写JSON：找不到类型为com.gk.promo.models.location.Location！的PersistentEntity；嵌套异常为com.fasterxml.jackson。 databind.JsonMappingException：找不到类型类com.gk.promo.models.location.Location的PersistentEntity（通过引用链：org.springframework.hateoas.PagedResources [\“ _ embedded \”]-> java.util.Collections $ UnmodifiableMap [\“ promotion \”]-> java.util.ArrayList [0]-> org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module $ PersistentEntityResourceSerializer $ 1 [\“ content \”]-> com.gk。 promo.models.promotion.Promotion [\“位置\”]）\ r \ n \ tat org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal（AbstractJackson2HttpMessageConverter.java:296）\ r \ n \ tat org.springframework .http.converter.AbstractGenericHttpMessageConverter.write（AbstractGenericHttpMessageConverter.java:103）\ r \ n \ tat org.springframework.web.servl et.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:289）\ r \ n \ tat org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue（RequestResponseBodyMethodProcessr。 \ n \ tat org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue（HandlerMethodReturnValueHandlerComposite.java:82）\ r \ n \ tat org.springframework.hateoas.mvc.ResourceProcessorHandlerMethodReturnValueHandler.handleReturnValue（ResourceProcessorHandlerMethodReturnValue（114） \ n \ tat org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue（HandlerMethodReturnValueHandlerComposite.java:82）\ r \ n \ tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod。 java：119）\ r \ n \ tat org.springframework.web.servlet.mvc.method.annotation.RequestMap pingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:895）\ r \ n \ tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:800）\ r \ n \ tat org.springframework。 web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:87）\ r \ n \ tat org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:1038）\ r \ n \ tat org。 springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:942）\ r \ n \ tat org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:998）\ r \ n \ tat org.springframework。 web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:890）\ r \ n \ tat javax.servlet.http.HttpServlet.service（HttpServlet.java:634）\ r \ n \ tat org.springframework.web.servlet。 FrameworkServlet.service（FrameworkServlet.java:875）\ r \ n \ tat javax.servlet.http.HttpServlet.service（HttpServlet.java:741）\ r \ n \ tat org.apache.catalina.core.Applic ationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.apache.tomcat.websocket.server。 WsFilter.doFilter（WsFilter.java:53）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain。 doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal（HttpTraceFilter.java:90）\ r \ n \ tat org.springframework.web。 filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache.catalina.core。 ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99）\ r \ n \ tat org.springframew ork.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache。 catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.web.filter.FormContentFilter.doFilterInternal（FormContentFilter.java:92）\ r \ n \ tat org.springframework.web。 filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache.catalina.core。 ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:93）\ r \ n \ tat org.springframework.web.filter.OncePerRequestFilter。 doFilter（OncePerRequestFilter.java:107）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193 ）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics（WebMvcMetricsFilter .java：154）\ r \ n \ tat org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics（WebMvcMetricsFilter.java:122）\ r \ n \ tat org.springframework.boot.actuate.metrics .web.servlet.WebMvcMetricsFilter.doFilterInternal（WebMvcMetricsFilter.java:107）\ r \ n \ tat org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）\ r \ n \ tat org.apache.catalina .core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）\ r \ n \ tat org.springframework.web.filter .CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:200）\ r \ n \ tat org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFil ter.java:107)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）\ r \ n \ tat org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain。 java：166）\ r \ n \ tat org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:199）\ r \ n \ tat org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java： 96）\ r \ n \ tat org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:490）\ r \ n \ tat org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:139） \ r \ n \ tat org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:92）\ r \ n \ tat org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:74）\ r \ n \ tat org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:343）\ r \ n \ tat org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:408）\ r \ n \ tat org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLig ht.java:66)\r\n\tat org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:770）\ r \ n \ tat org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor。 doRun（NioEndpoint.java:1415）\ r \ n \ tat org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）\ r \ n \ tat java.util.concurrent.ThreadPoolExecutor.runWorker（ ThreadPoolExecutor.java:1142)\r\n\tat java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）\ r \ n \ tat org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable。运行（TaskThread.java:61)\r\n\tat java.lang.Thread.run（Thread.java:745）\ r \ n原因：com.fasterxml.jackson.databind.JsonMappingException：无法找到PersistentEntity输入com.gk.promo.models.location.Location类！ （通过参考链：org.springframework.hateoas.PagedResources [\“ _ embedded \”]-> java.util.Collections $ UnmodifiableMap [\“ promotion \”]-> java.util.ArrayList [0]-> org.springframework .data.rest.webmvc.json.PersistentEntityJackson2Module $ PersistentEntityResourceSerializer $ 1 [\“ content \”]-> com.gk.promo.models.promotion.Promotion [\“ location \”]）\ r \ n \ tat com.fasterxml .jackson.databind.JsonMappingException.wrapWithPath（JsonMappingException.java:394）\ r \ n \ tat com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath（JsonMappingException.java:353）\ r \ n \ tat com.fasterxml.jackson .databind.ser.std.StdSerializer.wrapAndThrow（StdSerializer.java:316）\ r \ n \ tt com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:727）\ r \ n \ tat com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanSerializer.serialize（UnwrappingBeanSerializer.java:120）\ r \ n \ t com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter.serializeAsField（Unwrapping。 java：127）\ r \ n \ tat com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:719）\ r \ n \ tat com.fasterxml.jackson.databind.ser.BeanSerializer。 serialize（BeanSerializer.java:155）\ r \ n \ tat com.fasterxml.jackson.databind.SerializerProvider.defaultSerializeValue（SerializerProvider.java:1033）\ r \ n \ tat org.springframework.data.rest.webmvc.json。 PersistentEntityJackson2Module $ PersistentEntityResourceSerializer.serialize（PersistentEntityJackson2Module.java:202）\ r \ n \ tat org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module $ PersistentEntityResourceSerializer.serialize（PersistentEntityJ.2） fastxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents（IndexedListSerializer.java:119）\ r \ n \ tat com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize（IndexedListSerializer.java:79）\ r \ n \ tat com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize（IndexedListSerializer.java:18）\ r \ n \ t com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields（MapSerializer.java:718）\ r \ n \ t com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize（MapSerializer .java：639）\ r \ n \ tat com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize（MapSerializer.java:33）\ r \ n \ t org.springframework.hateoas.hal.Jackson2HalModule $ HalResourcesSerializer .serialize（Jackson2HalModule.java:349）\ r \ n \ tat org.springframework.hateoas.hal.Jackson2HalModule $ HalResourcesSerializer.serialize（Jackson2HalModule.java:308）\ r \ n \ tat com.fasterxml.jackson.databind.ser .BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:727）\ r \ n \ tat com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:719）\ r \ n \ tat com.fasterxml.jackson .databind.ser.BeanSerializer.serialize（BeanSerializer.java:155）\ r \ n \ tat com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize（DefaultSerializerProvider.java:480）\ r \ n \ tat com.fasterxml .jackson.databind.ser.D efaultSerializerProvider.serializeValue（DefaultSerializerProvider.java:319）\ r \ n \ t com.fasterxml.jackson.databind.ObjectWriter $ Prefetch.serialize（ObjectWriter.java:1396）\ r \ n \ tat com.fasterxml.jackson.databind。 ObjectWriter.writeValue（ObjectWriter.java:913）\ r \ n \ tat org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal（AbstractJackson2HttpMessageConverter.java:287）\ r \ n \ t ... 64更多\ r \ n原因：java.lang.IllegalArgumentException：找不到类型为com.gk.promo.models.location.Location！\ r \ n \ tat org.springframework.data.mapping.context.PersistentEntities.lambda $ getRequiredPersistentEntity的类型的PersistentEntity $ 2（PersistentEntities.java:96）\ r \ n \ tat org.springframework.data.mapping.context.PersistentEntities $$ Lambda $ 1311 / 331092961.get（Unknown Source）\ r \ n \ tat java.util.Optional.orElseThrow （可选.java：290）\ r \ n \ tat org.springframework.data.mapping.context.PersistentEntities.getRequiredPersistentEntity（PersistentEntities.java:95）\ r \ n \ tat org.springf ramework.data.rest.webmvc.json.PersistentEntityJackson2Module $ NestedEntitySerializer.toResource（PersistentEntityJackson2Module.java:386）\ r \ n \ tat org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module $ NestedEntitySerializer。 370）\ r \ n \ tat com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:727）\ r \ n \ t com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（ BeanSerializerBase.java:719)\r\n\t ...还有87个\ r \ n“，“路径”：“ / apipromocentral / promotions”}
尝试使用@EnableJpaRepositories（basePackages = {“ your.repositories.package”}）]