Spring Boot 在启动时抛出 BeanCreationException

Question

我已经开始将 Spring MVC/Spring Web Tomcat 应用程序迁移到 Spring Boot。目前我正在将 xml 配置文件迁移到 java 配置。

当我尝试通过 mvn spring-boot:run 启动我的应用程序时，出现以下错误:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageSource': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private net.faz.osc.MultitenancyService net.faz.osc.MessageSource.multitenancyService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multitenancyServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.servlet.http.HttpServletRequest net.faz.osc.MultitenancyServiceImpl.request; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.servlet.http.HttpServletRequest] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1208)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:626)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:468)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:117)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:689)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:321)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:969)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:958)
    at net.faz.osc.Application.main(Application.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.boot.maven.RunMojo$LaunchRunner.run(RunMojo.java:423)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private net.faz.osc.MultitenancyService net.faz.osc.MessageSource.multitenancyService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multitenancyServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.servlet.http.HttpServletRequest net.faz.osc.MultitenancyServiceImpl.request; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.servlet.http.HttpServletRequest] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 21 common frames omitted

导致错误的代码片段是

@Service
public class MultitenancyServiceImpl implements MultitenancyService {

    public static final String MANDANT_KONNTE_NICHT_UEBER_SERVERNAMEN_ERKANNT_WERDEN = "Mandant konnte nicht über Servernamen erkannt werden.";

    @Value("#{'${server.names.faz}'.split(',')}")
    private List<String> fazServerNames;

    @Value("#{'${server.names.rundschau}'.split(',')}")
    private List<String> rundschauServerNames;

    @Value("${vkorg.faz}")
    private String fazVkorg;

    @Value("${vkorg.rundschau}")
    private String rundschauVkorg;

    @Autowired(required = true)
    private HttpServletRequest request;

...

在研究我刚刚发现的网络时， Autowiring HttpServletRequest 应该总是可以正常工作......

在迁移到基于 java 的配置之前，应用程序作为放置在 tomcat 中的 WAR 文件运行良好。

有什么提示我遗漏了什么吗？如果需要更多信息，请告诉我，我将提供相关代码。

韩国哈比卜

Answer 1

由于 HttpServletRequest 是请求范围的 bean，您只能将其注入(inject)到请求对象中；示例 @Controller 类。

因此将 @Autowired(required = true) private HttpServletRequest request; 移动到 Controller 类，并通过 setter 将引用传递给 @Service 类。