Hibernate How to fix identifier of an instance altered from X to Y

Question

org hibernate HibernateException  identifier of an instance  of org cometd hibernate User altered from 12 to 3   in fact  my user table is really must dynamically change its value  my Java app is multithreaded  Any ideas how to fix it

User · Answer

In my particular case  this was caused by a method in my service implementation that needed the spring  Transactional readOnly   true  annotation  Once I added that  the issue was resolved   Unusual though  it was just a select statement

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It is a problem in your update method  Just instance new User before you save changes and you will be fine  If you use mapping between DTO and Entity class  than do this before mapping   I had this error also  I had User Object  trying to change his Location  Location was FK in User table  I solved this problem with   Transactional public void update User input  throws Exception        User userDB   userRepository findById input getUserId    orElse null       userDB setLocation new Location         userMapper updateEntityFromDto input  userDB        User user  userRepository save userDB

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In my case I had a primary key in the database that had an accent  but in other table its foreign key didn t have  For some reason  MySQL allowed this

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I was facing this issue  too   The target table is a relation table  wiring two IDs from different tables  I have a UNIQUE constraint on the value combination  replacing the PK  When updating one of the values of a tuple  this error occured   This is how the table looks like  MySQL    CREATE TABLE my relation table     mrt left id BIGINT NOT NULL    mrt right id BIGINT NOT NULL    UNIQUE KEY uix my relation table  mrt left id  mrt right id     FOREIGN KEY  mrt left id      REFERENCES left table lef id     FOREIGN KEY  mrt right id      REFERENCES right table rig id       The Entity class for the RelationWithUnique entity looks basically like this    Entity  IdClass RelationWithUnique class   Table name    my relation table   public class RelationWithUnique implements Serializable              Id    ManyToOne    JoinColumn name    mrt left id   referencedColumnName    left table lef id     private LeftTableEntity leftId      Id    ManyToOne    JoinColumn name    mrt right id   referencedColumnName    right table rig id     private RightTableEntity rightId           I fixed it by     usually  we need to detach the object as we are updating the PK     rightId being part of the UNIQUE constraint    gt  PK    but this would produce a duplicate entry      therefore  we simply delete the old tuple and add the new one final RelationWithUnique newRelation   new RelationWithUnique    newRelation setLeftId oldRelation getLeftId     newRelation setRightId rightId       here  the value is updated actually entityManager remove oldRelation   entityManager persist newRelation     Thanks a lot for the hint of the PK  I just missed it

User · Answer

Also ran into this error message  but the root cause was of a different flavor from those referenced in the other answers here   Generic answer  Make sure that once hibernate loads an entity  no code changes the primary key value in that object in any way  When hibernate flushes all changes back to the database  it throws this exception because the primary key changed  If you don t do it explicitly  look for places where this may happen unintentionally  perhaps on related entities that only have LAZY loading configured   In my case  I am using a mapping framework  MapStruct  to update an entity  In the process  also other referenced entities were being updates as mapping frameworks tend to do that by default  I was later replacing the original entity with new one  in DB terms  changed the value of the foreign key to reference a different row in the related table   the primary key of the previously-referenced entity was already updated  and hibernate attempted to persist this update on flush

User · Answer

In my case it was because the property was long on object but int in the mapping xml  this exception should be clearer

User · Answer

Faced the same Issue  I had an assosciation between 2 beans  In bean A I had defined the variable type as Integer and in bean B I had defined the same variable as Long   I changed both of them to Integer  This solved my issue

User · Answer

I solve this by instancing a new instance of depending Object  For an example  instanceA setInstanceB new InstanceB     instanceA setInstanceB YOUR NEW VALUE

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If you are using Spring MVC or Spring Boot try to avoid   ModelAttribute  user   in one controoler  and in other controller model addAttribute  user   userRepository findOne someId    This situation can produce such error

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Problem can be also in different types of object s PK   User  in your case  and type you ask hibernate to get session get type  id     In my case error was identifier of an instance of  lt skipped gt  was altered from 16 to 32   Object s PK type was Integer  hibernate was asked for Long type

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You must detach your entity from session before modifying its ID fields

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In my case  a template had a typo so instead of checking for equivalency      it was using an assignment equals       So I changed the template logic from   if  user1 id   user2 id        to   if  user1 id    user2 id        and now everything is fine   So  check your views as well

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This is an old question  but I m going to add the fix for my particular issue  Spring Boot  JPA using Hibernate  SQL Server 2014  since it doesn t exactly match the other answers included here   I had a foreign key  e g  my id    12345   but the value in the referenced column was my id    12345    It had an extra space at the end which hibernate didn t like  I removed the space  fixed the part of my code that was allowing this extra space  and everything works fine

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In my case getters and setter names were different from Variable name   private Long stockId      public Long getStockID             return stockId            public void setStockID Long stockID            this stockId   stockID          where it should be   public Long getStockId         return stockId    public void setStockId Long stockID        this stockId   stockID

User · Answer

Make sure you aren t trying to use the same User object more than once while changing the ID  In other words  if you were doing something in a batch type operation   User user   new User        Using the same one over and over  won t work List lt Customer gt  customers   fetchCustomersFromSomeService    for Customer customer   customers        User user   new User     lt -- This would work  you get a new one each time  user setId customer getId      user setName customer getName      saveUserToDB user

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In my case  I solved it changing the  Id field type from long to Long

User · Answer

Are you changing the primary key value of a User object somewhere  You shouldn t do that  Check that your mapping for the primary key is correct   What does your mapping XML file or mapping annotations look like

User · Answer

In my case  the PK Field in hbm xml was of type  integer  but in bean code it was long

[java] Hibernate: How to fix "identifier of an instance altered from X to Y"?

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