新手问题，maven运行环境或者其他配置出错 400 请求报错 

根据老师要求创建了文件后发现提示服务运行1秒后自动断开 Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'person.name' in value "${person.name}" 尝试了网上各种改jdk版本和重装maven仓库等之类均无法解决问了老师也无法解决，老师也查了没法解决，很焦灼啊，希望能够得到解决。 代码和报错信息如下   报错信息如下

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\/  __)| |)| | | | | || (| |  ) ) ) ) '  || .__|| ||| |_, | / / / / =========||==============|/=//// :: Spring Boot ::       (v1.5.16.RELEASE)

2018-09-20 15:45:22.597 INFO 4560 --- [ main] c.j.m.helloworld.HelloworldApplication : Starting HelloworldApplication on DESKTOP-RHLQ5D7 with PID 4560 (started by zxw in F:\2_研究生资料\编程练习以及常识问题\Eclipse安装及其使用\eclipse练习\helloworld) 2018-09-20 15:45:22.599 INFO 4560 --- [ main] c.j.m.helloworld.HelloworldApplication : No active profile set, falling back to default profiles: default 2018-09-20 15:45:22.632 INFO 4560 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@12405818: startup date [Thu Sep 20 15:45:22 CST 2018]; root of context hierarchy 2018-09-20 15:45:23.300 INFO 4560 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2018-09-20 15:45:23.315 INFO 4560 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2018-09-20 15:45:23.315 INFO 4560 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.34 2018-09-20 15:45:23.379 INFO 4560 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2018-09-20 15:45:23.380 INFO 4560 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 750 ms 2018-09-20 15:45:23.474 INFO 4560 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2018-09-20 15:45:23.479 INFO 4560 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2018-09-20 15:45:23.479 INFO 4560 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2018-09-20 15:45:23.479 INFO 4560 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2018-09-20 15:45:23.480 INFO 4560 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2018-09-20 15:45:23.504 WARN 4560 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'helloworld': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'person.name' in value "${person.name}" 2018-09-20 15:45:23.505 INFO 4560 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2018-09-20 15:45:23.517 INFO 4560 --- [ main] utoConfigurationReportLoggingInitializer :

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 2018-09-20 15:45:23.523 ERROR 4560 --- [ main] o.s.boot.SpringApplication : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'helloworld': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'person.name' in value "${person.name}" at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1269) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.16.RELEASE.jar:1.5.16.RELEASE] at com.jingchen.microservice.helloworld.HelloworldApplication.main(HelloworldApplication.java:10) [classes/:na] Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'person.name' in value "${person.name}" at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174) ~[spring-core-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:172) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:837) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1084) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1064) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE] ... 17 common frames omitted