复合微服务上的Spring Boot ClassCastException，一段时间后-OK

我的复合微服务（API网关）有两个微服务的奇怪行为。在第一个HTTP请求中，它返回ClassCastException，但一段时间后，它返回普通JSON。如何设置应用程序在第一个HTTP请求时返回正常的JSON

所有3个服务的配置都类似：spring.application.name、服务器端口、Eureka注册地址

有两种微服务：

汽车服务

（用

@Controller

注释）和

卡车服务

（用

@RestController

注释），返回

列表

和

列表

的方法对应如下：

@HystrixCommand(commandKey = "getCars", groupKey = "Cars")
@RequestMapping(value = "/cars", method = RequestMethod.GET)
public List<Car> getCars() {
    return carService.getAllCars();
}

完整的源代码可在

异常的堆栈跟踪如下所示：

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.springframework.context.annotation.AnnotationConfigApplicationContext@31eb7d: startup date [Mon Dec 21 21:17:00 EET 2015]; parent: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@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.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@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

2015-12-21 21:17:00.560信息26207---[nio-8883-exec-1]o.a.c.c.c.[Tomcat].[localhost].[/]：初始化Spring FrameworkServlet'dispatcherServlet'
2015-12-21 21:17:00.560信息26207---[nio-8883-exec-1]o.s.web.servlet.DispatcherServlet:FrameworkServlet“DispatcherServlet”：初始化已开始
2015-12-21 21:17:00.612信息26207---[nio-8883-exec-1]o.s.web.servlet.DispatcherServlet:FrameworkServlet“DispatcherServlet”：初始化在52毫秒内完成
2015-12-21 21:17:00.967信息26207---[trix-Vehicles-1]s.c.a.annotation配置应用程序上下文：刷新org.springframework.context.annotation。AnnotationConfigApplicationContext@31eb7d：启动日期[2015年12月21日星期一21:17:00 EET]；父项：org.springframework.boot.context.embedded。AnnotationConfigEmbeddedWebApplicationContext@2db9fb
2015-12-21 21:17:01.020信息26207---[trix-Vehicles-1]f.a.AutoWiredNotationBeanPostProcessor:JSR-330“javax.inject.inject”注释已找到并支持自动布线
2015-12-21 21:17:01.383信息26207---[trix-Vehicles-1]c.netflix.config.ChainedDynamicProperty:翻转属性：car-service.ribbon.ActiveConnectionsLimit使用下一个属性：niws.loadbalancer.availabilityFilteringRule.ActiveConnectionsLimit=2147483647
2015-12-21 21:17:01.525信息26207---[trix-Vehicles-1]c.netflix.loadbalancer.BaseLoadBalancer:Client:car服务实例化了一个loadbalancer:DynamicServerListLoadBalancer:{NFLoadBalancer:name=car服务，当前服务器列表=[]，负载均衡器统计数据=区域统计数据：{}，服务器统计数据：[]}服务器列表：null
2015-12-21 21:17:01.593信息26207---[trix-Vehicles-1]c.netflix.config.ChainedDynamicProperty:翻转属性：car-service.ribbon.ActiveConnectionsLimit使用下一个属性：niws.loadbalancer.availabilityFilteringRule.ActiveConnectionsLimit=2147483647
2015-12-21 21:17:01.600信息26207---[trix-Vehicles-1]c.n.l.DynamicServerListLoadBalancer:用于客户端汽车服务的DynamicServerListLoadBalancer已初始化：DynamicServerListLoadBalancer:{NFLoadBalancer:名称=汽车服务，当前服务器列表=[nikzgs-Latitude-E5420:8881]，负载平衡器统计数据=区域统计数据：{defaultzone=[区域：defaultzone；实例计数：1；活动连接计数：0；断路器跳闸计数：0；每个服务器的活动连接数：0.0；]
}，服务器统计信息：[服务器：nikzgs-Latitude-E5420:8881；区域：defaultZone；总请求数：0；连续连接失败：0；总断电秒数：0；最后一次连接：1970年1月1日星期四03:00:00 EET；第一次连接：1970年1月1日星期四03:00:00 EET；活动连接：0；最后一次总失败计数（1000）毫秒：0；平均响应时间：0.0；90%响应时间：0.0；95%响应时间：0.0；最小响应时间：0.0；最大响应时间：0.0；STDEV响应时间：0.0]
]}服务器列表：org.springframework.cloud.netflix.ribbon.eureka。DomainExtractingServerList@a14ec6
2015-12-21 21:17:02.054错误26207---[nio-8883-exec-1]o.a.c.c.c.[/].[dispatcherServlet]：路径为[]的上下文中Servlet[dispatcherServlet]的Servlet.service（）引发异常[请求处理失败；嵌套异常为java.lang.ClassCastException:java.lang.String不能被强制转换为my.vehicle.entity.VehiclesSummary]根本原因
java.lang.ClassCastException:java.lang.String不能强制转换为my.vehicle.entity.VehicleSummary
在my.simple.vehicle.VehicleController$$EnhancerBySpringCGLIB$$3b97a077.getAllVehicles（）~[composite-vehicle-service-0.0.1-SNAPSHOT.jar！/：0.0.1-SNAPSHOT]
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）~[na:1.8.0_65]
在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）~[na:1.8.0\u 65]
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）~[na:1.8.065]
在java.lang.reflect.Method.invoke（Method.java:497）~[na:1.8.0_65]
在org.springframework.web.method.support.InvocableHandlerMethod.doInvoke（InvocableHandlerMethod.java:222）~[spring-web-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:137）~[spring-web-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.servlet.mvc.method.annotation.ServletinInvocableHandlerMethod.invokeAndHandle（ServletinInvocableHandlerMethod.java:110）~[spring-webmvc-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:814）~[spring-webmvc-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:737）~[spring-webmvc-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:85）~[spring-webmvc-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:959）~[spring-webmvc-4.2.3.RELEASE.jar！/：4.2.3.RELEASE]
位于org.springframework.web.servlet.Dispa
@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;
    }
} 

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.springframework.context.annotation.AnnotationConfigApplicationContext@31eb7d: startup date [Mon Dec 21 21:17:00 EET 2015]; parent: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@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.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@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

@ResponseBody
@HystrixCommand(commandKey = "getAllVehicles", groupKey = "Vehicles", fallbackMethod = "returnErrorMessage")
@RequestMapping(value = "/vehicles", method = RequestMethod.GET)
public VehicleSummary getAllVehicles() {
    return vehicleService.getAllVehicles();
}

@HystrixCommand
private String returnErrorMessage() {
    return "Fallback error message";
}

@ResponseBody
@HystrixCommand(commandKey = "getAllVehicles", groupKey = "Vehicles", fallbackMethod = "returnErrorMessage")
@RequestMapping(value = "/vehicles", method = RequestMethod.GET)
public VehicleSummary getAllVehicles() {
    return vehicleService.getAllVehicles();
}

@HystrixCommand
private VehicleSummary returnErrorMessage() {
    return new VehicleSummary();
}