Hibernate Error org hibernate NonUniqueObjectException a different object with the same identifier value was already associated with the session

Question

I have two user Objects and while I try to save the object using   session save userObj     I am getting the following error   Caused by  org hibernate NonUniqueObjectException  a different object with the same identifier value was already associated with the session   com pojo rtrequests User com pojo rtrequests User d079b40b    I am creating the session using   BaseHibernateDAO dao   new BaseHibernateDAO               rtsession   dao getSession userData getRegion                               BaseHibernateDAO RTREQUESTS DATABASE NAME    rttrans   rtsession beginTransaction    rttrans begin     rtsession save userObj1   rtsession save userObj2    rtsession flush    rttrans commit     rtsession close       in finally block   I also tried doing the session clear   before saving  still no luck   This is for the first I am getting the session object when a user request comes  so I am getting why is saying that object is present in session   Any suggestions

User · Answer

I have solved a similar problem like that   plan    FcsRequestPlan  session load plan getClass    plan getUUID     while  plan instanceof HibernateProxy      plan    FcsRequestPlan    HibernateProxy  plan  getHibernateLazyInitializer   getImplementation

User · Answer

Get the object inside the session  here an example   MyObject ob   null  ob    MyObject  session get MyObject class  id

User · Answer

GeneratedValue strategy GenerationType IDENTITY   adding this annotation to the primary key property in your entity bean should solve this issue

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I encountered this problem with deleting an object  neither evict nor clear helped           Deletes the given entity  even if hibernate has an old reference to it     If the entity has already disappeared due to a db cascade then noop      public void delete final Object entity      Object merged   null    try       merged   getSession   merge entity         catch  ObjectNotFoundException e           disappeared already due to cascade     return        getSession   delete merged

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By default is using the identity strategy but I fixed it by adding  ID  GeneratedValue strategy   GenerationType IDENTITY

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Otherwise than what wbdarby said  it even can happen when an object is fetched by giving the identifier of the object to a HQL  In the case of trying to modify the object fields and save it back into DB modification could be insert  delete or update  over the same session  this error will appear  Try clearing the hibernate session before saving your modified object or create a brand new session    Hope i helped  -

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We are using an old version hibernate  3 2 6  and the problem for us was  that Hibernate expected the first column in the result set to be the generated primary key  Took me ages to figure that out  Solution  Ensure in that in the DDL the generated primary key is always the first column  Solution 2  Update hibernate

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As somebody already pointed above i ran into this problem when i had cascade all on both ends of a one-to-many relationship  so let s assume A --  B  one-to-many from A and many-to-one from B  and was updating instance of B in A and then calling saveOrUpdate A    it was resulting in a circular save request i e save of A triggers save of B that triggers save of A    and in the third instance as the entity  of A  was tried to be added to the sessionPersistenceContext the duplicateObject exception was thrown    nbsp  I could solve it by removing cascade from one end

User · Answer

Are your Id mappings correct  If the database is responsible for creating the Id through an identifier  you need to map your userobject to that

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This problem occurs when we update the same object of session  which we have used to fetch the object from database   You can use merge method of hibernate instead of update method   e g  First use session get   and then you can use session merge  object   This method will not create any problem  We can also use merge   method to update object in database

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Does this help    User userObj1   new User    User userObj2   userObj1        rtsession save userObj1   rtsession save userObj2

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This can happen when you have used same session object for read  amp  write  How  Say you have created one session  You read a record from employee table with primary key Emp id 101 Now You have modified the record in Java  And you are going to save the Employee record in database  we have not closed session anywhere here  As the object that was read also persist in the session  It conflicts with the object that we wish to write  Hence this error comes

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I ran into this problem by    Deleting an object  using HQL  Immediately storing a new object with the same id   I resolved it by flushing the results after the delete  and clearing the cache before saving the new object  String delQuery    DELETE FROM OasisNode   session createQuery  delQuery   executeUpdate    session flush    session clear

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Another thing that worked for me was to make the instance variable Long in place of long  I had my primary key variable long id  changing it to Long id  worked  All the best

User · Answer

Check if you forgot to put  GenerateValue for  Id column  I had same problem with many to many relationship between Movie and Genre  The program threw Hibernate Error  org hibernate NonUniqueObjectException  a different object with the same identifier value was already associated with the session error  I found out later that I just have to make sure you have  GenerateValue to the GenreId get method

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One workaround to solve this issue is try to read the object back from hibernate cache db before you make any updates and then persist   Example               OrderHeader oh   orderHeaderDAO get orderHeaderId               oh setShipFrom facilityForOrder               orderHeaderDAO persist oh     Note  Keep in mind that this does not fix the root cause but solves the issue

User · Answer

just check the id whether it takes null or 0 like  if offersubformtwo getId    null  amp  amp  offersubformtwo getId    0    in add or update where the content are set from form to Pojo

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I m new to NHibernate  and my problem was that I used a different session to query my object than I did to save it  So the saving session didn t know about the object    It seems obvious  but from reading the previous answers I was looking everywhere for 2 objects  not 2 sessions

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I resolved this problem    Actually this is happening because we forgot implementation of Generator Type of PK property in the bean class  So make it any type like as    Id  GeneratedValue strategy GenerationType IDENTITY  private int id    when we persist the objects of bean  every object acquired same ID  so first object is saved  when another object to be persist then HIB FW through this type of Exception  org hibernate NonUniqueObjectException  a different object with the same identifier value was already associated with the session

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Try this  The below worked for me   In the hbm xml file   We need to set the dynamic-update attribute of class tag to true      lt class dynamic-update  true  gt   Set the class attribute of the generator tag under unique column to identity    lt generator class  identity  gt     Note  Set the unique column to identity rather than assigned

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You can use session merge obj   if you are doing save with different sessions with same identifier persistent object  It worked  I had same issue before

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This is only one point where hibernate makes more problems than it solves  In my case there are many objects with the same identifier 0  because they are new and don t have one  The db generates them  Somewhere I have read that 0 signals Id not set  The intuitive way to persist them is iterating over them and saying hibernate to save the objects  But You can t do that -  Of course You should know that hibernate works this and that way  therefore You have to     So now I can try to change Ids to Long instead of long and look if it then works  In the end it s easier to do it with a simple mapper by your own  because hibernate is just an additional intransparent burden  Another example  Trying to read parameters from one database and persist them in another forces you to do nearly all work manually  But if you have to do it anyway  using hibernate is just additional work

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USe session evict object   The function of evict   method is used to remove instance from the session cache  So for first time saving the object  save object by calling session save object  method before evicting the object from the cache  In the same way update object by calling session saveOrUpdate object  or session update object  before calling evict

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I have had this error many times and it can be quite hard to track down     Basically  what hibernate is saying is that you have two objects which have the same identifier  same primary key  but they are not the same object   I would suggest you break down your code  i e  comment out bits until the error goes away and then put the code back until it comes back and you should find the error   It most often happens via cascading saves where there is a cascade save between object A and B  but object B has already been associated with the session but is not on the same instance of B as the one on A   What primary key generator are you using    The reason I ask is this error is related to how you re telling hibernate to ascertain the persistent state of an object  i e  whether an object is persistent or not   The error could be happening because hibernate is trying to persist an object that is already persistent  In fact  if you use save hibernate will try and persist that object  and maybe there is already an object with that same primary key associated with the session   Example  Assuming you have a hibernate class object for a table with 10 rows based on a primary key combination  column 1 and column 2   Now  you have removed 5 rows from the table at some point of time  Now  if you try to add the same 10 rows again  while hibernate tries to persist the objects in database  5 rows which were already removed will be added without errors  Now the remaining 5 rows which are already existing  will throw this exception    So the easy approach would be checking if you have updated removed any value in a table which is part of something and later are you trying to insert the same objects again

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I also ran into this problem and had a hard time to find the error   The problem I had was the following   The object has been read by a Dao with a different hibernate session   To avoid this exception  simply re-read the object with the dao that is going to save update this object later on   so   class A          readFoo           someDaoA read myBadAssObject     Different Session than in class B           class B      saveFoo           someDaoB read myBadAssObjectAgain     Different Session than in class A                     myBadAssObjectAgain fooValue    bar          persist               Hope that save some people a lot of time

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The problem happens because in same hibernate session you are trying to save two objects with same identifier There are two solutions -   This is happening because you have not configured your mapping xml file correctly for id fields as below -   lt id name  id  gt     lt column name  id  sql-type  bigint  not-null  true   gt     lt generator class  hibernateGeneratorClass  lt  generator gt   lt  id gt   Overload the getsession method to accept a Parameter like isSessionClear  and clear the session before returning the current session like below  public static Session getSession boolean isSessionClear        if  session isOpen    amp  amp  isSessionClear            session clear            return session        else if  session isOpen              return session        else           return sessionFactory openSession               This will cause existing session objects to be cleared and even if hibernate doesn t generate a unique identifier  assuming you have configured your database properly for a primary key using something like Auto Increment it should work for you

User · Answer

I have the same error I was replacing my Set with a new one get from Jackson   To solve this I keep the existing set  I remove from the old set the element unknown into the new list with retainAll  Then I add the new ones with addAll       this oldSet retainAll newSet       this oldSet addAll newSet     No need to have the Session and manipulate it

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before the position where repetitive objects begin   you should close the session  and then you should start a new session  session close          session   HibernateUtil getSessionFactory   openSession      so in this way in one session there is not more than one entities that have the same identifier

User · Answer

You can check your Cascade Settings  The Cascade settings on your models could be causing this  I removed Cascade Settings  Essentially not allowing Cascade Inserts Updates  and this solved my problem

User · Answer

Late to the party  but may help for coming users -   I got this issue when i select a record using getsession    and again update another record with same identifier using same session causes the issue  Added code below   Customer existingCustomer getSession   get Customer class 1   Customer customerFromUi    This customer details comiong from UI with identifer 1  getSession   update customerFromUi     Here the issue comes   This should never be done   Solution is either evict session before update or change business logic

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It s because you have open a session maybe for get data and then you forget to close it  When you delete you open session again then it becomes error   SOLUTION   every function should open and close session  session getTransaction begin       your operation    session close

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I had a similar problem  In my case I had forgotten to set the increment by value in the database to be the same like the one used by the cache size and allocationSize   The arrows point to the mentioned attributes   SQL   CREATED         26 07 16 LAST DDL TIME   26 07 16 SEQUENCE OWNER  MY SEQUENCE NAME   MY ID SEQ MIN VALUE       1 MAX VALUE       9999999999999999999999999999 INCREMENT BY    20  lt - CYCLE FLAG      N ORDER FLAG      N CACHE SIZE      20  lt - LAST NUMBER     180   Java    SequenceGenerator name    mySG   schema    my    sequenceName    my id seq   allocationSize   20  lt -

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In my model object class i ha defined the annotations like this    Entity  Table name    user details   public class UserDetails          GeneratedValue     private int userId      private String userName       public String getUserName             return userName             public void setUserName String userName            this userName   userName                 Id     public int getUserId             return userId             public void setUserId int userId            this userId   userId            the issue resolved when I writing the both  Id and  GenerateValue annotation together   the variable declaration    Entity  Table name    user details   public class UserDetails        Id      GeneratedValue     private int userId      private String userName       public String getUserName             return userName             public void setUserName String userName            this userName   userName                public int getUserId             return userId                Hope this is helpful

User · Answer

I just had the same problem  I solve it by adding this line   GeneratedValue strategy GenerationType IDENTITY

User · Answer

You always can do a session flush  Flush will synchronize the state of all your objects in session  please  someone correct me if i m wrong   and maybe it would solve your problem in some cases   Implementing your own equals and hashcode may help you too

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I found this error as well   What worked for me is to make sure that the primary key  that is auto-generated  is not a PDT  i e  long  int  ect    but an object  i e  Long  Integer  etc    When you create your object to save it  make sure you pass null and not 0

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In my run I follows  1- Switch to Lazy keys in the entity 2- download the most up to date from Maven  --http   mvnrepository com artifact org javassist javassist 3 19 0-GA

[java] Hibernate Error: org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session

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