Question

我正在用spring-boot，JPA和MySQL编写一个汽车租赁应用程序。我设法通过该应用程序向我的数据库添加了一些数据。我还从“汽车”表中删除了第一个实体。这导致引发以下异常：

    org.springframework.orm.jpa.JpaObjectRetrievalFailureException: Unable to find com.doszke.CarRent.model.Car with id 1; nested exception is javax.persistence.EntityNotFoundException: Unable to find com.doszke.CarRent.model.Car with id 1
...
at com.doszke.CarRent.service.ReservationService.getAll(ReservationService.java:39)
    at com.doszke.CarRent.PersistenceFacade.init(PersistenceFacade.java:34)
    at com.doszke.CarRent.PersistenceFacade.addCar_aroundBody7$advice(PersistenceFacade.java:24)
    at com.doszke.CarRent.PersistenceFacade.addCar(PersistenceFacade.java:1)
    at com.doszke.CarRent.PersistenceAspectTest.aspectTest(PersistenceAspectTest.java:27)
    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:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

我想提到的是，该应用程序非常大，我将只发布在堆栈跟踪中提到的代码。如果还不够，我可以发布一个GIT仓库。

更短的版本 我使用默认定义的Car从数据库中删除了一个public void JpaRepository.delete(T t)实例（使用签名JpaRepository<T, V>的ID为1的实例）。第二次运行该应用程序时，将所有Car个实体提取到列表时会崩溃。

长版我的ReservationService类getAll()方法上的堆栈跟踪点。接口DAO包含典型DAO类的行为。

/*imports*/

@Component("reservationService")
public class ReservationService implements DAO<Reservation>{

    @Autowired
    private ReservationRepository reservationRepository;

    ...

    @Override
    public List<Reservation> getAll() {
        return reservationRepository.findAll();
    }

}

ReservationRepository是扩展JpaRepository的接口。这些方法没有在任何地方实现，因此使用默认的spring-boot实现。

package com.doszke.CarRent.repositories;

import com.doszke.CarRent.model.Reservation;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface ReservationRepository extends JpaRepository<Reservation, Long> {
    //implementation- default methods of JpaRepository
}

现在类PersistenceFacade-此处的数据正在获取到列表中。

/*imports*/

@Scope("singleton")
@Component("facade")
public class PersistenceFacade {

    @Autowired
    private ClientService clientService;

    @Autowired
    private CarService carService;

    @Autowired
    private ReservationService reservationService;

    private List<Car> cars;
    private List<Reservation> reservations;
    private List<Client> clients;

    public void init(){
        cars = carService.getAll();
        clients = clientService.getAll();
        reservations = reservationService.getAll();
    }

...

}

我还发布了Car类代码。

package com.doszke.CarRent.model;

import com.doszke.CarRent.Factory;
import com.doszke.CarRent.model.behaviour.Mappable;
import com.doszke.CarRent.util.GenericTemplates;

import java.io.Serializable;
import java.util.Date;
import java.util.List;
import javax.persistence.*;

/**
 *
 * @author User
 */
@Entity
public class Car implements Serializable, Mappable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    public Long getId() {
        return id;
    }

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

    @Column(name = "registration_number")
    private String registrationNumber;
    private String brand;
    private String model;
    private double perDayCost;

    public Car() {
    }

    public Car(String registrationNumber, String brand, String model, double perDayCost) {
        this.registrationNumber = registrationNumber;
        this.brand = brand;
        this.model = model;
        this.perDayCost = perDayCost;
    }

    public String getRegistrationNumber() {
        return registrationNumber;
    }

    public void setRegistrationNumber(String registrationNumber) {
        this.registrationNumber = registrationNumber;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public double getPerDayCost() {
        return perDayCost;
    }

    public void setPerDayCost(double perDayCost) {
        this.perDayCost = perDayCost;
    }



    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        if (!(object instanceof Car)) {
            return false;
        }
        Car other = (Car) object;
        return (this.registrationNumber != null || other.getRegistrationNumber() == null) && (this.registrationNumber == null || this.registrationNumber.equals(other.getRegistrationNumber()));
    }

    @Override
    public String toString() {
        return "com.doszke.CarRent.model.Car[ id=" + id + ", registrationNumber=" + registrationNumber + ", brand=" + brand + ", model=" + model + ", perDayCost=" + perDayCost +  ']';
    }

    @Override
    public String[] map() {
        String[] s = new String[5];
        s[0] = String.valueOf(id);
        s[1] = registrationNumber;
        s[2] = brand;
        s[3] = model;
        s[4] = String.valueOf(perDayCost);
        return s;
    }

}

EntityNotFoundException：从数据库删除实体后，在获取所有实体时找不到ID为1的实体

0 个答案: