那些遇到过的问题

JSON解析错误:已经有id的POJO

Edu*_*cke 8 java json entity jackson spring-boot

我已经看到了关于这个主题的一些问题,但是我不能将它应用到我的案例中,因为我试图应用它们并继续错误.所以我来揭露我的情况.

我读了一些关于它的评论,并说如果我在类Entidade中更改了我的列idEntidade的名称,我可以成功.但我无法更改数据库.

我试图投入scope= Distritos.class我的@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "idDistrito")但是没有用.

我需要帮助.

我试图使用带有Angular的spring MVC将数据保存在我的数据库中.当我单击保存数据时,我收到此错误

2017-09-29 13:28:02.126  WARN 2716 --- [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Already had POJO for id (java.lang.Long) [[ObjectId: key=1, type=com.fasterxml.jackson.databind.deser.impl.PropertyBasedObjectIdGenerator, scope=java.lang.Object]]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Already had POJO for id (java.lang.Long) [[ObjectId: key=1, type=com.fasterxml.jackson.databind.deser.impl.PropertyBasedObjectIdGenerator, scope=java.lang.Object]] (through reference chain: digifred.global.model.Distritos["idEntidade"]->digifred.global.model.Entidades["idEntidade"])
2017-09-29 13:28:02.126  WARN 2716 --- [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Already had POJO for id (java.lang.Long) [[ObjectId: key=1, type=com.fasterxml.jackson.databind.deser.impl.PropertyBasedObjectIdGenerator, scope=java.lang.Object]]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Already had POJO for id (java.lang.Long) [[ObjectId: key=1, type=com.fasterxml.jackson.databind.deser.impl.PropertyBasedObjectIdGenerator, scope=java.lang.Object]] (through reference chain: digifred.global.model.Distritos["idEntidade"]->digifred.global.model.Entidades["idEntidade"])
2017-09-29 13:46:14.096  INFO 2716 --- [      Thread-46] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@53b2ae5: startup date [Fri Sep 29 13:23:36 BRT 2017]; root of context hierarchy
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我有这些课 

@Entity
@Table(name = "distritos", schema="glb")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Distritos.findAll", query = "SELECT d FROM Distritos d"),
    @NamedQuery(name = "Distritos.findByIdDistrito", query = "SELECT d FROM Distritos d WHERE d.idDistrito = :idDistrito"),
    @NamedQuery(name = "Distritos.findByNome", query = "SELECT d FROM Distritos d WHERE d.nome = :nome"),
    @NamedQuery(name = "Distritos.findByCodigoDne", query = "SELECT d FROM Distritos d WHERE d.codigoDne = :codigoDne"),
    @NamedQuery(name = "Distritos.findByFlagAtivo", query = "SELECT d FROM Distritos d WHERE d.flagAtivo = :flagAtivo")})




@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "idDistrito")        
public class Distritos implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_distrito")
    private Long idDistrito;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 70)
    @Column(name = "nome")
    private String nome;
    @Size(max = 8)
    @Column(name = "codigo_dne")
    private String codigoDne;
    @Column(name = "flag_ativo")
    private Integer flagAtivo;
    @JoinColumn()
    @ManyToOne
    private Entidades idEntidade;
    @JoinColumn()
    @ManyToOne(optional = false)
    private Municipios idMunicipio;
    @JoinColumn()
    @ManyToOne(optional = false)
    private Ufs idUf;

  gets and sets .. 
}
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Class Entidades

@Entity
@Table(name = "entidades", schema="glb")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Entidades.findAll", query = "SELECT e FROM Entidades e"),
    @NamedQuery(name = "Entidades.findByIdEntidade", query = "SELECT e FROM Entidades e WHERE e.idEntidade = :idEntidade"),
    @NamedQuery(name = "Entidades.findByBairro", query = "SELECT e FROM Entidades e WHERE e.bairro = :bairro"),
    @NamedQuery(name = "Entidades.findByBrasao", query = "SELECT e FROM Entidades e WHERE e.brasao = :brasao"),
    @NamedQuery(name = "Entidades.findByCnpj", query = "SELECT e FROM Entidades e WHERE e.cnpj = :cnpj"),
    @NamedQuery(name = "Entidades.findByComplemento", query = "SELECT e FROM Entidades e WHERE e.complemento = :complemento"),
    @NamedQuery(name = "Entidades.findByEmail", query = "SELECT e FROM Entidades e WHERE e.email = :email"),
    @NamedQuery(name = "Entidades.findByLogradouro", query = "SELECT e FROM Entidades e WHERE e.logradouro = :logradouro"),
    @NamedQuery(name = "Entidades.findByNome", query = "SELECT e FROM Entidades e WHERE e.nome = :nome"),
    @NamedQuery(name = "Entidades.findByNumero", query = "SELECT e FROM Entidades e WHERE e.numero = :numero"),
    @NamedQuery(name = "Entidades.findBySigla", query = "SELECT e FROM Entidades e WHERE e.sigla = :sigla"),
    @NamedQuery(name = "Entidades.findByTelefone", query = "SELECT e FROM Entidades e WHERE e.telefone = :telefone")})


@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "idEntidade")  
public class Entidades implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    private Long idEntidade;
    @Size(max = 50)
    private String bairro;
    private BigInteger brasao;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 14)
    private String cnpj;
    @Size(max = 20)
    private String complemento;
    // @Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="E-mail inválido")//if the field contains email address consider using this annotation to enforce field validation
    @Size(max = 30)
    private String email;
    @Size(max = 50)
    private String logradouro;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 70)
    private String nome;
    @Size(max = 20)
    private String numero;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 4)
    private String sigla;
    @Size(max = 12)
    private String telefone;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<EntidadesAdministradores> entidadesAdministradoresCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "entidades")
    private Collection<Bairros> bairrosCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<PessoasDeficiencias> pessoasDeficienciasCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<PessoasEnderecos> pessoasEnderecosCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<EntidadesLicencas> entidadesLicencasCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<PessoasContatos> pessoasContatosCollection;
    @OneToMany(mappedBy = "idEntidade")
    private Collection<Logradouros> logradourosCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<Pessoas> pessoasCollection;
    @JoinColumn()
    @ManyToOne(optional = false)
    private Municipios idMunicipio;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idEntidade")
    private Collection<PessoasCaracteristicas> pessoasCaracteristicasCollection;

    public Entidades() {
    }
          .... gets and sets . . 

    }
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Class DistritosController

@RestController
@RequestMapping(value="/user")
public class DistritosController {

    @Autowired
    DistritosService distritosService; 


    @RequestMapping(method = RequestMethod.POST, value = "/distritos", consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Distritos> cadastrarDistritos(@RequestBody Distritos distritos) {
        Distritos distritosCadastrado = distritosService.cadastrar(distritos);
        return new ResponseEntity<Distritos>(distritosCadastrado, HttpStatus.CREATED);
    }

    @RequestMapping(method = RequestMethod.GET, value = "/distritos", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Collection<Distritos>> buscarTodosDistritos() {
        Collection<Distritos> distritosBuscados = distritosService.buscarTodos();
        return new ResponseEntity<>(distritosBuscados, HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.GET, value = "/distritos/{id}", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Distritos> buscarDistritosPorId(@PathVariable int id) {
        Distritos distritos = distritosService.buscaPorId(id);
        return new ResponseEntity<>(distritos, HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.DELETE, value = "/distritos/{id}")
    public ResponseEntity<Distritos> excluirDistritos(@PathVariable int id) {
        Distritos distritoEncontrado = distritosService.buscaPorId(id);
        if (distritoEncontrado == null) {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
        distritosService.excluir(distritoEncontrado);
        return new ResponseEntity<>(HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.PUT, value = "/distritos", consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Distritos> alterarDistritos(@RequestBody Distritos distritos) {
        Distritos distritoAlterado = distritosService.alterar(distritos);
        return new ResponseEntity<Distritos>(distritoAlterado, HttpStatus.OK);
    }


}
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Ana*_*mov 6

有两个问题：

1.身份范围

两者@JsonIdentityInfo都应在范围内，因为您的两个类都具有相同的生成器类型- ObjectIdGenerators.PropertyGenerator.class。

范围用于定义对象ID的适用性：所有ID在其范围内必须唯一；其中范围定义为此值和生成器类型的组合。比较是简单等价的，这意味着类型生成器类型和作用域类必须相同。范围用于确定需要多少个发电机；通常仅在外部对象ID具有重叠的值域（即，仅在某些有限范围内唯一）的情况下才需要多个范围

对于Distritos： 

@JsonIdentityInfo(scope = Distritos.class, generator = ObjectIdGenerators.PropertyGenerator.class, property = "idDistrito")
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对于Entidades： 

@JsonIdentityInfo(scope = Entidades.class, generator = ObjectIdGenerators.PropertyGenerator.class, property = "idEntidade")
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2.现场命名

@JoinColumn()
@ManyToOne
private Entidades idEntidade;
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以某种方式干扰

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
private Long idEntidade;
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当您将一个完整的Distritos对象（Entidades如您的示例中的内容）传递给Jackson解串器时。

我做了一些调试，发现BeanDeserializer（它通过名称解析字段）未能反序列化属性字段，因为它命名相同id字段，所以我改变了idEntidade对entidade中Distritos类。

经过这些更改后，我的示例项目运行正常（因为我已经从您的类中删除了一些字段- Distritos.idMunicipio，从Entidades中删除了Distritos.idUf所有Collections）。您必须检查其他类（例如Municipios和Ufs）是否存在相同的问题，并进行修复。

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