Hibernate ids for this class must be manually assigned before calling save

Question

I am having some problems with Hibernate and the oneToMany mapping   Here is my function           Location location   new Location            location setDateTime new Date             location setLatitude lat           location setLongitude lon            location   this locationDao save location            merchant   new Merchant            merchant setAddress address           merchant setCity city           merchant setCountry country           merchant setLocation location           merchant setName name           merchant setOrganization organization           merchant setPublicId publicId           merchant setZipCode zipCode           merchant setApplication this applicationDAO findByPublicId applicationPublicId             merchant   this merchantDao save merchant            return merchant    Here are my two entities   Location   import java io Serializable  import java util Date  import java util List  import javax persistence    import javax validation constraints NotNull  import javax xml bind annotation XmlRootElement  import javax xml bind annotation XmlTransient     Entity  Table name    location    XmlRootElement public class Location implements Serializable       private static final long serialVersionUID   1L        Id      GeneratedValue strategy   GenerationType IDENTITY       Basic optional   false       Column name    id   nullable   false      private Long id        Basic optional   false       NotNull      Column name    latitude   nullable   false      private double latitude        Basic optional   false       NotNull      Column name    longitude   nullable   false      private double longitude        Basic optional   false       NotNull      Column name    date time   nullable   false       Temporal TemporalType TIMESTAMP      private Date dateTime        OneToMany cascade   CascadeType ALL  mappedBy    location       private List lt Merchant gt  retailerList        OneToMany cascade   CascadeType ALL  mappedBy    location       private List lt MobileUser gt  userList       public Location                public Location Long id            this id   id             public Location Long id  double latitude  double longitude  Date dateTime            this id   id          this latitude   latitude          this longitude   longitude          this dateTime   dateTime             public Long getId             return id              getters and setters        XmlTransient     public List lt Merchant gt  getRetailerList             return retailerList             public void setRetailerList List lt Merchant gt  retailerList            this retailerList   retailerList              XmlTransient     public List lt MobileUser gt  getUserList             return userList             public void setUserList List lt MobileUser gt  userList            this userList   userList              Override     public int hashCode             int hash   0          hash     id    null   id hashCode     0           return hash              Override     public boolean equals Object object               TODO  Warning - this method won t work in the case the id fields are not set         if    object instanceof Location                 return false                    Location other    Location  object          if   this id    null  amp  amp  other id    null      this id    null  amp  amp   this id equals other id                  return false                    return true              Override     public String toString             return  com fgsecure geoloc entities Location  id     id                 Merchant   import java io Serializable  import javax persistence    import javax validation constraints NotNull  import javax validation constraints Size  import javax xml bind annotation XmlRootElement  import org codehaus jackson annotate JsonAutoDetect  import org codehaus jackson annotate JsonIgnore     JsonAutoDetect  Entity  Table name    retailer    XmlRootElement  public class Merchant implements Serializable        private static final long serialVersionUID   1L       JsonIgnore      Id      GeneratedValue strategy   GenerationType IDENTITY       Basic optional   false       Column name    id   nullable   false      private Long id       Basic optional   false       NotNull      Size min   1  max   50       Column name    public id   nullable   false  length   50      private String publicId       Basic optional   false       NotNull      Size min   1  max   50       Column name    name   nullable   false  length   50      private String name       Size max   50       Column name    organization   length   50      private String organization       Size max   128       Column name    address   length   128      private String address       Size max   10       Column name    zip code   length   10      private String zipCode       Size max   50       Column name    city   length   50      private String city       Size max   50       Column name    country   length   50      private String country       JoinColumn name    location id   referencedColumnName    id   nullable   false       ManyToOne optional   false      private Location location       JoinColumn name    application id   referencedColumnName    id   nullable   false       ManyToOne optional   false      private Application application        public Merchant                public Merchant Long id            this id   id             public Merchant Long id  String publicId  String name            this id   id          this publicId   publicId          this name   name              getters and setters        Override     public int hashCode             int hash   0          hash     id    null   id hashCode     0           return hash              Override     public boolean equals Object object               TODO  Warning - this method won t work in the case the id fields are not set         if    object instanceof Merchant                 return false                    Merchant other    Merchant  object          if   this id    null  amp  amp  other id    null      this id    null  amp  amp   this id equals other id                  return false                    return true              Override     public String toString             return  com fgsecure geoloc entities Retailer  id     id                   And each time I am calling my function I get    org hibernate id IdentifierGenerationException  ids for this class must be manually assigned before calling save      for this line    location   this locationDao save location     I don t understand why   Because in that case there is no need to manually assigne the id of location as it is auto generated  I must have done something wrong but after 3 days looking I don t find   I am using PostGreSQL and the id is an autogenerated ID with this sequence    nextval  location id seq   regclass     EDIT SOLVE   Ok Thanks for your answers   If it can help other person in the future  just need to modify the param of the id by         Id      GeneratedValue strategy   GenerationType IDENTITY       Basic optional   false       Column name    id  unique true  nullable   false

User · Answer

Assign primary key in hibernate

Make sure that the attribute is primary key and Auto Incrementable in the database. Then map it into the data class with the annotation with @GeneratedValue annotation using IDENTITY.

@Entity
@Table(name = "client")
data class Client(
        @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") private val id: Int? = null
)

GL

Source

User · Answer

your id attribute is not set  this MAY be due to the fact that the DB field is not set to auto increment  what DB are you using  MySQL  is your field set to AUTO INCREMENT

[java] Hibernate: ids for this class must be manually assigned before calling save()

Assign primary key in hibernate

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