java - spring - 启动(创建 beans 时出错) - org.springframework.beans.factory.UnsatisfiedDependencyException : Error creating bean with name

Question

尝试使用 jpa/hibernate 创建一个基本的 web 服务。但是 bean 没有被初始化。谁能帮我解决这个问题？

下面是我的 CustomerController.java :

@RestController
public class CustomerController {

    @Autowired
    CustomerService service;

    @SuppressWarnings("deprecation")
    @PostMapping(value = "/getCust", consumes=MediaType.APPLICATION_JSON_UTF8_VALUE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public List<CustomerModel> retriveCustomers(@RequestBody CustomerModel cust){
        System.out.println(cust); //just to see the object in console
        List<CustomerModel> resp = service.getCustomers();
        return resp;
    }
}

下面是我的 CustomerService.java:

@Service
public class CustomerService {

    @Autowired
    CustomerRepository repo;

    public List<CustomerModel> getCustomers() {
        List<CustomerModel> resp=repo.getAllCustomers();
        return resp;
    }


}

下面是我的 CustomerRepository.java:

@Repository
public interface CustomerRepository extends CrudRepository<CustomerModel, Integer>{

    List<CustomerModel> getAllCustomers();
}

下面是我的 CustomerModel.java:

@Entity
@Table(name="aliens")
public class CustomerModel {

    @Id
    @Column(name="customer_id")
    private String customerId;

    @Column(name="customer_name")
    private String customerName;

    @Column(name="customer_email")
    private String customerEmail;

    @Column(name="customer_phoneNum")
    private String customerPhoneNum;

    @Column(name="customer_password")
    private String customerPassword;


}

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerController': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerService': Unsatisfied dependency expressed through field 'repo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.ekart.fabfeet.service.CustomerRepository.getAllCustomers()! No property getAllCustomers found for type CustomerModel!

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:397) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]

Answer 1

在 CrudRepository 上，您可以使用 findAll() 方法，文档 here

当列出对象时，我建议您从 PagingAndSortingRepository 扩展，在那里您将完成分页和排序的实现，这非常方便。

关于错误，可以找到正确的语法here (getAll 不存在，你应该使用 findAll)。