JPA OneToOne发现所有卡在回路中

Question

我有一个带有JPA的JavaRESTAPI。每当我创建一个实体时，我还希望创建另一个具有forgein键的实体。或者有人可以给我其他建议，我会非常感激，并从中学习=）当我成功创建一家公司时，它也会在数据库中创建一个文件实体，因此工作正常。但是，每当我在JPA存储库中执行findAll方法时，它都会给我一个我创建的公司的循环。这样地：

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公司班

package nl.hulpvriend.dehulpvriend.company;
import javax.validation.constraints.NotNull;
import lombok.*;
import nl.hulpvriend.dehulpvriend.file.File;

import javax.persistence.*;
import javax.validation.constraints.Size;

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Setter
@Getter
public class Company {


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @NotNull
    private String email;

    @Column(unique = true)
    @NotNull(message = "The company name cannot be empty")
    @Size(max = 30, message = "Company name cannot be longer than 30 characters")
    private String name;

    @NotNull(message = "Company must contain a service type")
    @Enumerated(EnumType.STRING)
    private ServiceType serviceType;

    private double stars;

    private Integer pricePerHour;

    private String description;

    private String kvk;

    @OneToOne(mappedBy="company", cascade = CascadeType.ALL)
    private File file;


}

File.class

package nl.hulpvriend.dehulpvriend.file;

import lombok.*;
import nl.hulpvriend.dehulpvriend.company.Company;
import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;
import javax.validation.constraints.NotNull;

@AllArgsConstructor
@Getter
@Setter
@NoArgsConstructor
@Entity
@Data
public class File {

    @Id
    private Integer id;

    private String fileId;

    @OneToOne(fetch = FetchType.EAGER)
    @MapsId
    private Company company;

    @NotNull(message = "Must contain a data")
    @Lob
    private byte[] data;

    private String downloadUrl;

    private String fileName;

    private String fileType;

    public File(String fileName, String fileType, byte[] data) {
        this.fileName = fileName;
        this.fileType = fileType;
        this.data = data;
    }

}

Answer 1

将JsonIgnore添加到其中一个引用以中断循环：

例如在File类中：

@JsonIgnore
@OneToOne(fetch = FetchType.EAGER)
@MapsId
private Company company;