JPA双向关系抛出java.lang.StackOverflower错误:null
我试图将两个实体与JPA联系起来,当我运行项目时,不要抛出错误,但当我请求获得Comunity领导人选民的方法时,我得到了下一个例外:JPA双向关系抛出java.lang.StackOverflower错误:null,java,spring,hibernate,jpa,relationship,Java,Spring,Hibernate,Jpa,Relationship,我试图将两个实体与JPA联系起来,当我运行项目时,不要抛出错误,但当我请求获得Comunity领导人选民的方法时,我得到了下一个例外: java.lang.StackOverflowError: null at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na] at com.goog
java.lang.StackOverflowError: null
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.Gson$FutureTypeAdapter.write(Gson.java:1018) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:97) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:61) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.Gson$FutureTypeAdapter.write(Gson.java:1018) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:97) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:61) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.5.jar:na]
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.5.jar:na]
at com.google.gson.Gson$FutureTypeAdapter.write(Gson.java:1018) ~[gson-2.8.5.jar:na]
我就像一个循环,我不知道如何解决这个问题
以下是我的课程:
1) 领导实体:
@Entity
@Table(name = "leaders")
public class Leader implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@NotEmpty
String phone;
@NotEmpty
String name;
@OneToMany( mappedBy = "leader", fetch = FetchType.LAZY,cascade = CascadeType.ALL, orphanRemoval = true)
private List<Voter> voters;
public Leader() {
voters = new ArrayList<>();
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getCelular() {
return phone;
}
public void setCelular(String celular) {
this.phone = celular;
}
public String getNombre() {
return name;
}
public void setNombre(String nombre) {
this.name = nombre;
}
public List<Voter> getVotantes() {
return voters;
}
public void setVotantes(List<Voter> votantes) {
this.voters = votantes;
}
public void addVotante(Voter votante){
voters.add(votante);
}
}
@Entity
@Table(name = "voters")
public class Voter implements Serializable {
@Id
String id;
String name;
String phone;
String email;
@Column(name = "electoral_school")
String electoralSchool;
@Temporal(TemporalType.DATE)
Date registrationDate;
@ManyToOne(fetch = FetchType.LAZY)
private Leader leader;
@ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
Sector sector;
@PrePersist
public void prePersist() {
registrationDate = new Date();
}
public String getCedula() {
return id;
}
public void setCedula(String cedula) {
this.id = cedula;
}
public String getNombre() {
return name;
}
public void setNombre(String nombre) {
this.name = nombre;
}
public String getTelefono() {
return phone;
}
public void setTelefono(String telefono) {
this.phone = telefono;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getColegioElectoral() {
return electoralSchool;
}
public void setColegioElectoral(String colegioElectoral) {
this.electoralSchool = colegioElectoral;
}
public Leader getDirigente() {
return leader;
}
public void setDirigente(Leader dirigente) {
this.leader = dirigente;
}
public Date getRegistro() {
return registrationDate;
}
public void setRegistro(Timestamp registro) {
this.registrationDate = registro;
}
}
3) 领导控制器:
@Controller
@RequestMapping("/leader")
public class LeaderController {
@Autowired
IDirigenteService leaderService;
@RequestMapping(value="getVoters/{leader_id}")
@ResponseBody
public String getAll(@PathVariable(value = "leader_id") Long leader_id){
Gson gson = new Gson();
return gson.toJson(leaderService.findById(leader_id).getVotantes());
}
}
我用import.sql中的测试数据填充表格
提前感谢。您的
Leader
和Voter
类彼此有引用,因此序列化进入递归
将@JsonIgnoreProperties
添加到相应字段:
@OneToMany( mappedBy = "leader", fetch = FetchType.LAZY,cascade = CascadeType.ALL, orphanRemoval = true)
@JsonIgnoreProperties("leader")
private List<Voter> voters;
PS:哦,这是给杰克逊的,不是给格森的。但想法是一样的——看看如何排除用于序列化的字段。正确,序列化以无限递归结束,试图序列化相互引用的对象 使用Gson序列化引用的类型时,请尝试使用排除策略 在下面的代码片段中,我已通知Gson排除用
ManyToOne
注释的Leader
类中的字段:
@RequestMapping(value="getVoters/{leader_id}")
@ResponseBody
public String getAll(@PathVariable(value = "leader_id") Long leader_id){
ExclusionStrategy strategy = new ExclusionStrategy() {
@Override
public boolean shouldSkipField(FieldAttributes field) {
return field.getDeclaringClass() == Leader.class &&
field.getAnnotation(OneToMany.class) != null;
}
@Override
public boolean shouldSkipClass(Class<?> clazz) {
return false;
}
};
Gson gson = new GsonBuilder().disableHtmlEscaping()
.addSerializationExclusionStrategy(strategy)
.create();
return gson.toJson(leaderService.findById(leader_id).getVotantes());
}
@RequestMapping(value=“getvorters/{leader\u id}”)
@应答器
公共字符串getAll(@PathVariable(value=“leader\u id”)长leader\u id){
排除策略=新排除策略(){
@凌驾
公共布尔值shouldSkipField(字段属性字段){
返回字段.getDeclaringClass()==Leader.class&&
field.getAnnotation(OneToMany.class)!=null;
}
@凌驾
公共布尔shouldSkipClass(类clazz){
返回false;
}
};
Gson Gson=new GsonBuilder().disableHtmlEscaping()
.AddSerializationExclutionStrategy(策略)
.create();
返回gson.toJson(leaderService.findById(leader_id.getVotantes());
}
Hibernate OneToMany或JPA双向关系抛出java.lang.StackOverflower错误:null
是一个循环依赖性问题,如果使用@Data
复杂注释,可能源于Lombok的toString()
自动生成方法
要排除某个字段的循环依赖项,或者更好,如果不需要toString(),可以使用@Getter
和@Setter
。嗯,当我遇到上述问题时,这些解决方案对我有效
然后可以对特定属性使用@JsonIgnore
@Getter
@Setter
public class MyClass {
}
我改成了jackson,并像你一样编写了代码,但它是相同的java.lang.StackOverflower错误:null
@Getter
@Setter
public class MyClass {
}