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《Springboot极简教程》MappingMongoConverter:Failed to convert from type [java.lang.String]to type [long] for value 'null'; nested exception isjava.lang.IllegalArgumentException: A null value cannot be assigned to aprimitive type

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Failed toconvert from type [java.lang.String] to type [long] for value 'null'; nestedexception is java.lang.IllegalArgumentException: A null value cannot beassigned to a primitive type>

org.springframework.core.convert.support.GenericConversionService.assertNotPrimitiveTargetType(GenericConversionService.java:336)org.springframework.core.convert.support.GenericConversionService.handleResult(GenericConversionService.java:329)org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:204)org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:187)org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleRead(MappingMongoConverter.java:828)org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1216)org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:84)org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1162)org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1125)org.springframework.data.mapping.model.PersistentEntityParameterValueProvider.getParameterValue(PersistentEntityParameterValueProvider.java:78)org.springframework.data.mapping.model.SpELExpressionParameterValueProvider.getParameterValue(SpELExpressionParameterValueProvider.java:63)org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:71)org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:83)org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:257)org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:237)org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:197)org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:193)org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:84)org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2313)org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1966)org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1784)org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1767)org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:641)org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:359)org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:197)org.springframework.data.mongodb.repository.support.SimpleMongoRepository.findAll(SimpleMongoRepository.java:51)sun.reflect.NativeMethodAccessorImpl.invoke0(Native 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Method)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:497)org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)javax.servlet.http.HttpServlet.service(HttpServlet.java:622)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)javax.servlet.http.HttpServlet.service(HttpServlet.java:729)org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:108)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)org.springframework.security.web.FilterChainProxy$Vi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