EntityNotFoundException in Hibernate Many To One mapping however data exist

Question

I am getting javax.persistence.EntityNotFoundException error when I am trying to get User through Invoice object

invoice.getUser().getId()

Error is as follows

javax.persistence.EntityNotFoundException: Unable to find com.indianretailshop.domain.User with id 5     at org.hibernate.ejb.Ejb3Configuration$Ejb3EntityNotFoundDelegate.handleEntityNotFound(Ejb3Configuration.java:137)     at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:189)     at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:178)     at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:215) 

Entity classes are as follows(getters and setters are not included)

@Entity @Table(name="users") public class User implements Serializable {     private static final long serialVersionUID = 1L;      @Id     @GeneratedValue(strategy=GenerationType.AUTO)     @Column(unique=true, nullable=false)     private int id;      .         .         .      //bi-directional many-to-one association to Invoice     @OneToMany(mappedBy="user")     private List<Invoice> invoices; }  @Entity @Table(name="invoice") public class Invoice implements Serializable {     private static final long serialVersionUID = 1L;      @Id     @GeneratedValue(strategy=GenerationType.AUTO)     @Column(unique=true, nullable=false)     private int id;         .         .         .      //bi-directional many-to-one association to User     @ManyToOne(fetch=FetchType.LAZY)     @JoinColumn(name="Users_id")     private User user; } 

Answer 1

I had the same problem, and

@NotFound(action = NotFoundAction.IGNORE) 

solved my problem.

Answer 2

If you use @ManyToOne, the referenced entity must exist. The only other option is to specify that field as a long and retrieve the referenced entity by means of a separate query.

Throws an exception (javax.persistence.EntityNotFoundException) instead of returning null if it can't find the requested entity.

Use @NotFound annotation to resolve this exception if you are lazy loading and not handling this exception manually.

 @ManyToOne(         fetch = FetchType.LAZY)     @NotFound(         action = NotFoundAction.IGNORE)     @JoinColumn(         name = COLUMN,         referencedColumnName = COLUMN,         insertable = false,         updatable = false)     private Table table;