A 类不能转换为 A 类

Question

I'm developing a REST API in Java SpringBoot using Hibernate JPA and SQL Server as database.

My app throws the following Exception:

java.lang.ClassCastException: class com.estrelladekleene.safetycar.dto.DriverDTO cannot be cast to class com.estrelladekleene.safetycar.dto.DriverDTO (com.estrelladekleene.safetycar.dto.DriverDTO is in unnamed module of loader 'app'; com.estrelladekleene.safetycar.dto.DriverDTO is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @47e566be)

The problem appears in the following lines of code

public DriverDTO getDriverByPhoneNumber(String phoneNumber) {
    DriverDTO driverDTO= entityManager.createQuery("SELECT d FROM DriverDTO d WHERE d.phoneNumber="+phoneNumber,DriverDTO.class).getSingleResult();
    return driverDTO;
}

This is my DriverDTO class:

@Entity
@Table(name = "Driver")

public class DriverDTO {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;

@Column(name = "phoneNumber")
private String phoneNumber;

@Column(name = "fullName")
private String fullName;

@Column(name = "mail")
private String mail;

@Column(name = "batteryPercentage")
private Integer batteryPercentage;

@Column(name = "firebaseId")
private String firebaseId;

public DriverDTO() {
}

public DriverDTO(Long id, String phoneNumber, String fullName, String mail, Integer batteryPercentage, String firebaseId) {
    this.id = id;
    this.phoneNumber = phoneNumber;
    this.fullName = fullName;
    this.mail = mail;
    this.batteryPercentage = batteryPercentage;
    this.firebaseId = firebaseId;
}

This is my database Table and as you can see the Columns matches DriverDTO class:

When I do the following I have no problem at all:

public List<DriverDTO> getAllDrivers() {
    List<DriverDTO> driverDTOS = entityManager.createQuery("SELECT d FROM DriverDTO d", DriverDTO.class).getResultList();
    return driverDTOS;
}

I can't seem to do a simple where query. I also tried querying this way: entityManager.find(DriverDTO.class,1); and it doesn't work either. In my database does exist id=1 row.

Answer 1

Finally after a lot of research I found that this problem is related to spring dev tools package. My solution was removing the package from my pom.xml that in my case wasn't required.