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我有我的複合微服務（API網關）的2個微服務奇怪的行爲。在第一個HTTP請求時，它返回ClassCastException，但是一段時間後它返回正常的JSON。如何設置應用程序在第一個HTTP請求上正確返回正常的JSON？Spring Boot ClassCastException複合微服務，一段時間後 - 確定
所有3個服務的配置類似：spring.application.name，服務器端口，Eureka註冊地址。
有2個微服務：car-service和truck-service（與@RestController註解）（與@Controller註解），該返回List<Car>和List<Truck>相應地方法：
@HystrixCommand(commandKey = "getCars", groupKey = "Cars")
@RequestMapping(value = "/cars", method = RequestMethod.GET)
public List<Car> getCars() {
return carService.getAllCars();
}
和
@ResponseBody
@RequestMapping(value = "/trucks", method = RequestMethod.GET)
public List<Truck> getTrucks() {
return truckService.getAllTrucks();
}
（設定這兩個服務到@Controller或@RestController不影響行爲）
複合車輛服務商與@FeignClient註釋注射2個接口，並返回複合對象VehicleSummary具有List<Car>List<Truck>和與標準getter和setter字段：
@Component
public class VehicleService {
@Inject
private CarClient carClient;
@Inject
private TruckClient truckClient;
public VehicleSummary getAllVehicles() {
List<Car> cars = carClient.getAllCars();
List<Truck> trucks = truckClient.getTrucks();
VehicleSummary summary = new VehicleSummary();
summary.setCars(cars);
summary.setTrucks(trucks);
return summary;
}
}
完整的源代碼可在https://github.com/t3rmin41/simple-microservices-app
的堆棧跟蹤的例外情況如下：
2015-12-21 21:17:00.560 INFO 26207 --- [nio-8883-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2015-12-21 21:17:00.560 INFO 26207 --- [nio-8883-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2015-12-21 21:17:00.612 INFO 26207 --- [nio-8883-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 52 ms
2015-12-21 21:17:00.967 INFO 26207 --- [trix-Vehicles-1] s.c.a.AnnotationConfigApplicationContext : Refreshing org.spring[email protected]31eb7d: startup date [Mon Dec 21 21:17:00 EET 2015]; parent: org.springframework.boot[email protected]2db9fb
2015-12-21 21:17:01.020 INFO 26207 --- [trix-Vehicles-1] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2015-12-21 21:17:01.383 INFO 26207 --- [trix-Vehicles-1] c.netflix.config.ChainedDynamicProperty : Flipping property: car-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2015-12-21 21:17:01.525 INFO 26207 --- [trix-Vehicles-1] c.netflix.loadbalancer.BaseLoadBalancer : Client:car-service instantiated a LoadBalancer:DynamicServerListLoadBalancer:{NFLoadBalancer:name=car-service,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2015-12-21 21:17:01.593 INFO 26207 --- [trix-Vehicles-1] c.netflix.config.ChainedDynamicProperty : Flipping property: car-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2015-12-21 21:17:01.600 INFO 26207 --- [trix-Vehicles-1] c.n.l.DynamicServerListLoadBalancer : DynamicServerListLoadBalancer for client car-service initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=car-service,current list of Servers=[nikzgs-Latitude-E5420:8881],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone; Instance count:1; Active connections count: 0; Circuit breaker tripped count: 0; Active connections per server: 0.0;]
},Server stats: [[Server:nikzgs-Latitude-E5420:8881; Zone:defaultZone; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 03:00:00 EET 1970; First connection made: Thu Jan 01 03:00:00 EET 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0;stddev resp time:0.0]
]}ServerList:org.springf[email protected]a14ec6
2015-12-21 21:17:02.054 ERROR 26207 --- [nio-8883-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to my.vehicle.entity.VehicleSummary] with root cause
java.lang.ClassCastException: java.lang.String cannot be cast to my.vehicle.entity.VehicleSummary
at my.simple.vehicle.VehicleController$$EnhancerBySpringCGLIB$$3b97a077.getAllVehicles(<generated>) ~[composite-vehicle-service-0.0.1-SNAPSHOT.jar!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_65]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_65]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:242) ~[spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111) ~[spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103) ~[spring-boot-actuator-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_65]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.28.jar!/:8.0.28]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
2015-12-21 21:17:02.535 INFO 26207 --- [ool-10-thread-1] c.netflix.config.ChainedDynamicProperty : Flipping property: car-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2015-12-21 21:17:07.778 INFO 26207 --- [pool-6-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_VEHICLE-SERVICE/nikzgs-Latitude-E5420 - Re-registering apps/VEHICLE-SERVICE
2015-12-21 21:17:07.778 INFO 26207 --- [pool-6-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_VEHICLE-SERVICE/nikzgs-Latitude-E5420: registering service...
2015-12-21 21:17:07.791 INFO 26207 --- [pool-6-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_VEHICLE-SERVICE/nikzgs-Latitude-E5420 - registration status: 204
請添加相關代碼和配置，並且不希望人們通過你的全代碼庫閱讀並期望幫助。 –
我試圖儘可能地保持代碼儘可能小並且解耦。你不會找到長度超過50行的源代碼（hystrix儀表板中的MockStreamServlet.java除外） – t3rmin41