xml設定なしのアノテーションまたはJava設定を使用してコンストラクタを介して要求スコープBeanを注入

Question

次のコントローラ、サービス、およびBeanコードを使用してサンプルのSpringブートレストアプリケーションを作成しました。私は春のブートアプリを起動すると

@RestController 
public class SampleController { 

    @Autowired 
    SampleService sampleService; 

    @Autowired 
    User user; 

    @ResponseBody 
    @GetMapping(value="/user/add") 
    public String addUser(User user) { 
     return sampleService.getUserName(); 
    } 
} 

@Component 
public class SampleService { 


    private User user; 

    public User getUser() { 
     return user; 
    } 

    @Required 
    public void setUser(User user) { 
     this.user = user; 
    } 

    public String getUserName() { 
     return "user name is "+this.getUser(); 
    } 
} 

@RequestScope 
@Component 
public class User { 

    private String username; 

    private String password; 

    public String getUsername() { 
     return username; 
    } 

    public void setUsername(String username) { 
     this.username = username; 
    } 

    public String getPassword() { 
     return password; 
    } 

    public void setPassword(String password) { 
     this.password = password; 
    } 
} 

@Configuration 
public class RequestBean { 

    @Bean 
    @Scope(scopeName = "request", proxyMode = ScopedProxyMode.TARGET_CLASS) 
    public User initUser() { 
     User user = new User(); 
     return user; 
    } 
} 

、私は私がこれを解決するために助けてください、このエラー

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sampleController': Unsatisfied dependency expressed through field 'sampleService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sampleService' defined in file [<path>\samplespringrest\target\classes\com\example\SampleService.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanInitializationException: Property 'user' is required for bean 'sampleService' 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:569) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:349) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
    at com.example.SamplespringrestApplication.main(SamplespringrestApplication.java:10) [classes/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_65] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_65] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_65] 
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_65] 
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sampleService' defined in file [<path>/SampleService.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanInitializationException: Property 'user' is required for bean 'sampleService' 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:207) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1128) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1056) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:566) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    ... 24 common frames omitted 
Caused by: org.springframework.beans.factory.BeanInitializationException: Property 'user' is required for bean 'sampleService' 
    at org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor.postProcessPropertyValues(RequiredAnnotationBeanPostProcessor.java:156) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    ... 33 common frames omitted 

の下に取得しています。

ありがとうございます。私はのように、応答取得しています

@Component 
public class SampleService { 

    @Autowired 
    private User user; 

    public User getUser() { 
     return user; 
    } 

    public void setUser(User user) { 
     this.user = user; 
    } 

    public String getUserName() { 
     return "user name is "+this.getUser().getUsername(); 
    } 
} 

以下のいずれかのように私のサービスクラスを更新した後

更新

Answer 1

実際

あなたはライフサイクルが制限されている「ユーザ名がnullです」リクエストスコープでユーザBeanを作成し、同時にを使用します。@がSampleServiceのセッターに必要です。だから、アプリケーション開始時に何のリクエストも得られていない - >ユーザーBeanは作成しなかった - >必要なアノテーションが例外をスローしました。これは@RequestScope注釈ドキュメントから明らかだ：

{@code @RequestScopeは} 用{@linkスコープ@Scope}の特殊そのライフサイクルの現在のWeb要求にバインドされている*成分です。

このように設定すると、この例外が発生します。