java - Spring BeanCreationException 错误

Question

我正在研究STS数据库连接。

我尝试连接我的本地数据库。

我的HomeController.java:

@Controller
public class HomeController {

@Autowired private AccountRepository AccountRepository;

//@Autowired
//private AccountDaoImpl AccountDaoImpl;

//private AccountDao AccountDao;

@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Locale locale, Model model) {
    return "home";
}

@RequestMapping(value = "/home", method = RequestMethod.GET)
public String homehome(Locale locale, Model model) {
    return "home";
}
@RequestMapping(value = "/login", method = RequestMethod.POST)
public @ResponseBody List<Account> getUserList() {

    return AccountRepository.findAll();
    //EntityManagerFactory emf = Persistence.createEntityManagerFactory("NewPersistenceUnit");
    //AccountDaoImpl.entityManager = emf.createEntityManager();
    //return AccountDaoImpl.getAccount();
}
//@RequestMapping(value = "/login", method = RequestMethod.POST)
//public String login(Locale locale, Model model) {
//  
//  EntityManagerFactory emf = Persistence.createEntityManagerFactory(
//  return "login";
//}
}

AccountRepository.java:

@Service
public interface AccountRepository extends JpaRepository<Account, Long> {
}

我的帐户.java:

 @Entity
 @Table(name = "Account")
 public class Account implements Serializable {
 @Id
 @Column(name = "email")
 private String email;
 @Column(name = "id")
 private String id;
 @Column(name = "password")
 private String password;

 public void setEmail(String email) {
     this.email = email;
 }

 public String getEmail() {
     return email;
 }

 public String getId() {
     return id;
 }

 public void setId(String id) {
     this.id = id;
 }

 public String getPassword() {
     return password;
 }

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

我认为 AccountRepository.java 有 @Service，但我收到此错误。

HTTP Status 500 - Servlet.init() for servlet appServlet threw exception

type Exception report

message Servlet.init() for servlet appServlet threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet appServlet threw exception org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:277) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745) root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.myongjoon.spring.AccountRepository com.myongjoon.spring.HomeController.AccountRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.myongjoon.spring.AccountRepository] 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)} org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628) org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665) org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518) org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459) org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:277) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745) root cause

org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.myongjoon.spring.AccountRepository com.myongjoon.spring.HomeController.AccountRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.myongjoon.spring.AccountRepository] 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)} org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517) org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628) org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665) org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518) org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459) org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:277) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745) root cause

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.myongjoon.spring.AccountRepository] 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)} org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:988) org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:858) org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770) org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489) org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628) org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599) org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665) org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518) org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459) org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:277) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745) note The full stack trace of the root cause is available in the Pivotal tc Runtime 3.1.2.RELEASE/8.0.26.B.RELEASE logs.

Pivotal tc Runtime 3.1.2.RELEASE/8.0.26.B.RELEASE

我想避免这个错误。

我该怎么办？

Answer 1

根本情况是:“找不到 com.myongjoon.spring.AccountRepository 类型的合格 bean”。

这是因为，您的代码看起来像是您尝试将 Spring-Data-Jpa 用于您的存储库。但这需要:

• 您的存储库只是一个接口(interface)(没有 @Service 注释)和

• 您需要启用 Spring-Data-Jpa，方法是

  • <springjpa:repositories base-package="com.your.repositories.package" /> (命名空间 springjpa = http://www.springframework.org/schema/data/jpa/spring-jpa.xsd )或
  • @EnableJpaRepositories("com.your.repositories.package")

@参见:Spring-Data-Jpa Reference