Styjun

So im implmenting an API using springboot, spring-data and Jackson, but im having some troubles when im trying to POST a request to an endpoint who have a Bidirection relationship of @OneToMany.

I dont have so much background so i need really help.

I have two Entities:

Partida

package lucas.duarte.jazz.model.bean;

import java.io.Serializable;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import com.fasterxml.jackson.annotation.JsonProperty;

@Entity
public class Partida implements Serializable 
 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;
 private String timeA;
 private String timeB;
 private boolean visitante;
 @OneToMany(mappedBy = "partida", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
 private List<Set> sets;


 public List<Set> getSets() 
 return sets;
 

 public void setSets(List<Set> sets) 
 this.sets = sets;
 

 public Long getId() 
 return id;
 

 public void setId(Long id) 
 this.id = id;
 

 public String getTimeA() 
 return timeA;
 

 // Mocado o valor pois o Time A sempre e a Sao Judas
 public void setTimeA(String timeA) 
 this.timeA = timeA;
 

 public String getTimeB() 
 return timeB;
 

 public void setTimeB(String timeB) 
 this.timeB = timeB;
 

 public boolean isVisitante() 
 return visitante;
 

 public void setVisitante(boolean visitante) 
 this.visitante = visitante;
 

and SET

package lucas.duarte.jazz.model.bean;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

@Entity
@Table(name = "meu_set")
public class Set implements Serializable 
 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;
 @Column(name = "ponto_a")
 private long pontoA;
 @Column(name = "ponto_b")
 private long pontoB;
 @Column(name = "set_finalizado")
 private boolean setFinalizado;
 @ManyToOne
 @JoinColumn(name = "partida_id")
 private Partida partida;

 public Long getId() 
 return id;
 

 public void setId(Long id) 
 this.id = id;
 

 public long getPontoA() 
 return pontoA;
 

 public void setPontoA(long pontoA) 
 this.pontoA = pontoA;
 

 public long getPontoB() 
 return pontoB;
 

 public void setPontoB(long pontoB) 
 this.pontoB = pontoB;
 

 public boolean isSetFinalizado() 
 return setFinalizado;
 

 public void setSetFinalizado(boolean setFinalizado) 
 this.setFinalizado = setFinalizado;
 

 public Partida getPartida() 
 return partida;
 

 public void setPartida(Partida partida) 
 this.partida = partida;
 

This is my SetControler

package lucas.duarte.jazz.controller;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.util.UriComponentsBuilder;

import lucas.duarte.jazz.model.bean.Set;
import lucas.duarte.jazz.model.service.SetService;

@Controller
@RequestMapping("/api")
public class SetController 

 private SetService setServ;

 @RequestMapping(value = "/set/", method = RequestMethod.POST)
 public ResponseEntity<?> salvarSet(@RequestBody Set set, UriComponentsBuilder ucBuilder) 
 System.out.println("Vou cadastrar um set vinculado a uma partida");
 System.out.println(set.getPartida().getId());
 setServ.salvarSet(set);
 return new ResponseEntity(HttpStatus.CREATED);
 

When i POST to the URL, i get the following return

 "timestamp": "2019-03-28T04:17:46.857+0000",
 "status": 400,
 "error": "Bad Request",
 "message": "JSON parse error: Cannot construct instance of `lucas.duarte.jazz.model.bean.Partida` (although at least one Creator exists): no int/Int-argument constructor/factory method to deserialize from Number value (1); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `lucas.duarte.jazz.model.bean.Partida` (although at least one Creator exists): no int/Int-argument constructor/factory method to deserialize from Number value (1)n at [Source: (PushbackInputStream); line: 5, column: 14] (through reference chain: lucas.duarte.jazz.model.bean.Set["partida"])",
 "path": "/api/set/"

I Already have a Partida inside my database, but i cannot POST to this method, need really help.

This issue has nothing to do with JPA bi-directional mapping. Its raising error at the time of de serializing.

Partida -> should have zero argument constructor

Request payload should have "partida":"id":123 in order to populate partida object property.

for details check this link Jackson library.

@Entity
public class Partida implements Serializable 
 private static final long serialVersionUID = 1L;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;
 private String timeA;
 private String timeB;
 private boolean visitante;
 public Partida()
 //Default constructor required here 
 
 @OneToMany(mappedBy = "partida", fetch = FetchType.LAZY, cascade = 
 CascadeType.ALL)
 private List<Set> sets;


 public List<Set> getSets() 
 return sets;
 

 public void setSets(List<Set> sets) 
 this.sets = sets;
 

 public Long getId() 
 return id;
 

 public void setId(Long id) 
 this.id = id;
 

 public String getTimeA() 
 return timeA;
 

 // Mocado o valor pois o Time A sempre e a Sao Judas
 public void setTimeA(String timeA) 
 this.timeA = timeA;
 

 public String getTimeB() 
 return timeB;
 

 public void setTimeB(String timeB) 
 this.timeB = timeB;
 

 public boolean isVisitante() 
 return visitante;
 

 public void setVisitante(boolean visitante) 
 this.visitante = visitante;
 

if issue not not resolved then try JSON creator

@JsonCreator
 public Partida(@JsonProperty("id") Long id, @JsonProperty("timeA") String 
 timeA, @JsonProperty("timeB") String timeB, @JsonProperty("desc") boolean
 visitante) 
 this.id = id;
 this.timeA = timeA;
 this.timeB= timeB;
 this.visitante= visitante;