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

Question

Caused by  org springframework orm hibernate3 HibernateSystemException  ids for this class must be manually assigned before calling save    com rfid model Role  nested exception is org hibernate id IdentifierGenerationException  ids for this class must be manually assigned before calling save    com rfid model Role     at org springframework orm hibernate3 SessionFactoryUtils convertHibernateAccessException SessionFactoryUtils java 676      at org springframework orm hibernate3 HibernateAccessor convertHibernateAccessException HibernateAccessor java 412      at org springframework orm hibernate3 HibernateTemplate doExecute HibernateTemplate java 424      at org springframework orm hibernate3 HibernateTemplate executeWithNativeSession HibernateTemplate java 374      at org springframework orm hibernate3 HibernateTemplate saveOrUpdate HibernateTemplate java 748      at com wfos engine wrapper domain impl WrapperImpl save WrapperImpl java 159          47 more     Caused by  org hibernate id IdentifierGenerationException  ids for this class must be manually assigned before calling save    com rfid model Role     at org hibernate id Assigned generate Assigned java 53      at org hibernate event def AbstractSaveEventListener saveWithGeneratedId AbstractSaveEventListener java 121      at org hibernate event def DefaultSaveOrUpdateEventListener saveWithGeneratedOrRequestedId DefaultSaveOrUpdateEventListener java 210      at org hibernate event def DefaultSaveOrUpdateEventListener entityIsTransient DefaultSaveOrUpdateEventListener java 195      at org hibernate event def DefaultSaveOrUpdateEventListener performSaveOrUpdate DefaultSaveOrUpdateEventListener java 117      at org hibernate event def DefaultSaveOrUpdateEventListener onSaveOrUpdate DefaultSaveOrUpdateEventListener java 93      at org hibernate impl SessionImpl fireSaveOrUpdate SessionImpl java 685      at org hibernate impl SessionImpl saveOrUpdate SessionImpl java 677      at org hibernate impl SessionImpl saveOrUpdate SessionImpl java 673      at org springframework orm hibernate3 HibernateTemplate 16 doInHibernate HibernateTemplate java 751      at org springframework orm hibernate3 HibernateTemplate doExecute HibernateTemplate java 419          50 more     WARN  21 14 21   CommonsLoggingOutput java 59   - --Erroring  batchId 1  message java lang reflect UndeclaredThrowableException    My class is like this    Entity  javax persistence Table name  Role    Table appliesTo    Role   public class Role     Id    Column name  U id   public String U id   public String U pwd   public String U account   public String U mode   public String U status    public String getU pwd         return U pwd     public void setU pwd String u pwd        U pwd   u pwd     public String getU account         return U account     public void setU account String u account        U account   u account     public String getU id         return U id     public void setU id String u id        U id   u id     public String getU mode         return U mode     public void setU mode String u mode        U mode   u mode     public String getU status         return U status     public void setU status String u status        U status   u status

User · Answer

Your  Entity class has a String type for its  Id field  so it can t generate ids for you   If you change it to an auto increment in the DB and a Long in java  and add the  GeneratedValue annotation    Id  Column name  U id    GeneratedValue strategy GenerationType IDENTITY  private Long U id    it will handle incrementing id generation for you

User · Answer

For hibernate it is important to know that your object WILL have an id  when you want to persist save it  Thus  make sure that      private String U id    will have a value  by the time you are going to persist your object  You can do that with the  GeneratedValue annotation or by assigning a value manually   In the case you need or want to assign your id s manually  and that s what the above error is actually about   I would prefer passing the values for the fields to your constructor  at least for U id  e g     public Role  String U id            This ensures that your object has an id  by the time you have instantiated it  I don t know what your use case is and how your application behaves in concurrency  however  in some cases this is not recommended  You need to ensure that your id is unique   Further note  Hibernate will still require a default constructor  as stated in the hibernate documentation  In order to prevent you  and maybe other programmers if you re designing an api  of instantiations of Role using the default constructor  just declare it as private

User · Answer

Here is what I did to solve just by 2 ways    make ID column as int type if you are using autogenerate in ID dont assing value in the setter of ID  If your mapping the some then sometimes autogenetated ID is not concedered   I dont know why  try using  GeneratedValue strategy GenerationType SEQUENCE  if possible

User · Answer

Resolved this problem using a Sequence ID defined in Oracle database   ORACLE DB SEQ ID is defined as a sequence for the table  Also look at the console to see the Hibernate SQL that is used to verify    Id  Column name    MY ID   unique   true  nullable   false   GeneratedValue strategy GenerationType SEQUENCE  generator    id Sequence    SequenceGenerator name    id Sequence   sequenceName    ORACLE DB SEQ ID   Long myId

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

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