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java - Hibernate 与 Spring Data JPA 一对一映射的堆栈溢出错误

转载 作者：行者123 更新时间：2023-12-01 16:34:14 24 4
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我的问题与此类似https://discourse.hibernate.org/t/hibernate-throws-org-hibernate-id-identifiergenerationexception-attempted-to-assign-id-from-null-one-to-one-property/1777但在应用此线程的答案后，我遇到了不同的异常。

我的实体:

@Entity
@Table(name = "location")
public class Location {

    @Id
    private Long id;

    @Column(name = "country_code")
    private String countryCode;

    private Double longitude;

    private Double latitude;

    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private Distributor distributor;

    public Distributor getDistributor() {
        return distributor;
    }

// here I apply the advice from the linked thread above
    public void setDistributor(Distributor distributor) {
        this.distributor = distributor;
        this.id = distributor.getId();
    }
// other getters/setters
}
@Entity
@Table
public class Distributor {

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

    private String name;
    private String site;

    @OneToOne(
            mappedBy = "distributor",
            cascade = CascadeType.ALL,
            orphanRemoval = true,
            fetch = FetchType.LAZY,
            optional = false
    )
    private Location location;

// getters/setters/constructor

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Distributor )) return false;
        Distributor that = (Distributor ) o;
        return Objects.equals(id, that.id);
    }

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

}

具有相应 Spring Data Repository 的 Controller :

    @PostMapping
    public ResponseEntity<Distributor> test(@RequestBody Distributor distributor) {
        distributor.getLocation().setDistributor (distributor);

        return ResponseEntity.ok(repository.save(distributor));
    }

使用此有效负载:

{
    "name" : "name1",
    "location" : {
        "countryCode" : "US",
        "longitude" : 34 ,
        "latitude" : 12
    }
}

我收到带有适当字段的无尽嵌套响应(分销商 -> 位置 -> 分销商 -> 位置..)，以 SO 错误结尾:

java.lang.StackOverflowError: null
    at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[na:na]
    at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621) ~[na:na]
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579) ~[na:na]
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:741) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:723) ~[jackson-databind-2.11.0.jar:2.11.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.11.0.jar:2.11.0]
....

我无法理解为什么会发生这种情况，我遵循了所有可用的教程。

最佳答案

这是因为 Location 和 Distributor 之间存在循环依赖关系。

由于两者都互相引用，因此它们不断序列化内部引用。

您可以使用jackson注释@JsonBackReference和@JsonManagedReference来避免这种情况。

JsonBackReference: skips serialization of annotated property

JsonManagedReference : forward reference and serializes annotated property

就您而言，这应该可行。

//Distributor class
@JsonManagedReference
private Location location;

//Location class 
@JsonBackReference
private Distributor distributor;

关于java - Hibernate 与 Spring Data JPA 一对一映射的堆栈溢出错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61993704/

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