N'a pas pu écrire du contenu: échec paresseusement initialiser une collection de rôle

J'en ai Une-À-Plusieurs relation, voici mon code

@Entity
@Table(name = "catalog")
public class Catalog {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "catalog_id")
private int catalog_id;
@NotEmpty
@Size(min = 3, max = 255)
@Column(name = "name", nullable = false)
private String name;
@OneToMany(mappedBy="mycatalogorder")
private List<Order> orders;
@OneToMany(mappedBy="mycatalog")
private List<CatalogItem> items;
//setters and getters
}
@Entity
@Table(name = "catalogitem")
public class CatalogItem {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "catalogitem_id")
private int catalogitem_id;
@NotEmpty
@Size(min = 3, max = 255)
@Column(name = "name", nullable = false)
private String name;
@NotEmpty
@Column(name = "price", nullable = false)
private Double price;
@OneToOne(mappedBy="ordercatalogitem", cascade=CascadeType.ALL)
private OrderItem morderitem;
@ManyToOne
@JoinColumn(name="catalog_id", nullable=false)
private Catalog mycatalog;
//setters and getters
}
@Entity
@Table(name = "orders")
public class Order {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "order_id")
private int order_id;
@NotEmpty
@Size(min = 3, max = 255)
@Column(name = "name", nullable = false)
private String name;
@NotEmpty
@Size(min = 3, max = 1024)
@Column(name = "note", nullable = false)
private String note;
@Temporal(TemporalType.TIMESTAMP)
@DateTimeFormat(pattern = "ddmmYYYY HH:mm:ss")
@Column(name = "created", nullable = false)
private Date created;
@OneToMany(mappedBy="myorder")
private Set<OrderItem> orderItems;
@ManyToOne
@JoinColumn(name="catalog_id", nullable=false)
private Catalog mycatalogorder;
@PrePersist
protected void onCreate() {
created = new Date();
}
//setters and getters
}
@Entity
@Table(name = "orderitem")
public class OrderItem {
@Id
@Column(name="catalogitem_id", unique=true, nullable=false)
@GeneratedValue(generator="gen")
@GenericGenerator(name="gen", strategy="foreign", parameters=@Parameter(name="property", value="catalogitem"))
private int catalogitem_id;
@Column(name = "quantity")
private int quantity;
@OneToOne
@PrimaryKeyJoinColumn
private CatalogItem ordercatalogitem;
@ManyToOne
@JoinColumn(name="order_id", nullable=false)
private Order myorder;
//setters and getters
}

Et je suis l'exception:

org.springframework.http.convertisseur de.HttpMessageNotWritableException:
N'a pas pu écrire du contenu: échec paresseusement initialiser une collection de
rôle: com.exemple.helios.de modèle.De catalogue.articles, n'a pas pu initialiser
proxy - pas de Session; nested exception est
com.fasterxml.jackson.databind.JsonMappingException: échec paresseusement
initialiser une collection de rôle:
com.exemple.helios.de modèle.De catalogue.articles, n'a pas pu initialiser proxy -
pas de Session
org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:271)
org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:100)
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:222)
org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:183)
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:80)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126)

Mes versions:

• SpringFramework 4.2.4.COMMUNIQUÉ de
• Hibernate 4.3.11.Final
• Jackson 2.7.4
• Jacksontype 2.7.1

OriginalL'auteur KostasC | 2017-02-07