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我想創建雙向的學生紀律關係。任何事情都可以正常工作，直到我將用戶註冊爲紀律。現在我得到無限遞歸。休眠無限循環遞歸在多對多的關係中
類看起來是這樣的：出現
//Student.java
@Entity
@Table(name = "students")
public class Student {
@NotNull
@Id
@Column(name = "STUDENT_ID")
private String id;
private String name;
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
@JoinTable(name = "students_disciplines", joinColumns = @JoinColumn(name = "STUDENT_ID"), inverseJoinColumns = @JoinColumn(name = "DISCIPLINE_ID"))
@JsonSerialize(using = NestedDisciplineSetSerializer.class)
private Set<Discipline> disciplines = new HashSet<>();
//Getters, Setters
}
//NestedDisciplineSetSerializer.java
public class NestedDisciplineSetSerializer extends JsonSerializer<Set<Discipline>> {
@Override
public void serialize(Set<Discipline> value, JsonGenerator jgen, SerializerProvider p) throws IOException, JsonProcessingException {
jgen.writeStartArray();
for (Discipline s : value) {
jgen.writeStartObject();
jgen.writeStringField("name", s.getName());
jgen.writeNumberField("id", s.getId());
jgen.writeBooleanField("recommended", s.isRecommended());
jgen.writeEndObject();
}
jgen.writeEndArray();
}
}
//Discipline.java
@Entity`enter code here`
@Table(name = "disciplines")
public class Discipline {
@GeneratedValue(strategy = GenerationType.AUTO)
@Id
@Column(name = "DISCIPLINE_ID")
private int id;
@NotNull
private String name;
@NotNull
private int credits;
private String annotation;
private boolean recommended;
@ManyToMany(mappedBy = "disciplines", fetch = FetchType.EAGER)
@JsonSerialize(using = NestedStudentSetSerializer.class)
private Set<Student> students = new HashSet<>();
//Getters, Setters
}
//NestedStudentSetSerializer.java
public class NestedStudentSetSerializer extends JsonSerializer<Set<Student>> {
@Override
public void serialize(Set<Student> value, JsonGenerator jgen, SerializerProvider p) throws IOException, JsonProcessingException {
jgen.writeStartArray();
for (Student s : value) {
jgen.writeStartObject();
jgen.writeStringField("name", s.getName());
jgen.writeStringField("id", s.getId());
jgen.writeEndObject();
}
jgen.writeEndArray();
}
}
錯誤被加載時設置Student s = sDao.findOne(id);
試圖在這裏搜索後，但沒能找到合適的解決方案。任何取得相同結果的東西。
謝謝回答，問題是我已經用於簡化生成getter和setter的龍目島庫。對於創建循環的兩個實體，它都是@Data annotation生成的hashCode（）方法。歡迎您致電： – TrueLecter
謝謝您的反饋。 – davidxxx