org hibernate PersistentObjectException detached entity passed to persist

Question

I had successfully written my first master child example with hibernate  After few days I took it again and upgraded some libraries  No sure what did I do but I could never make it run again  Would somebody help my figure out what is wrong in code that is returning following error message   org hibernate PersistentObjectException  detached entity passed to persist  example forms InvoiceItem     at org hibernate event def DefaultPersistEventListener onPersist DefaultPersistEventListener java 127      at org hibernate impl SessionImpl firePersist SessionImpl java 799      at org hibernate impl SessionImpl persist SessionImpl java 791            truncated    hibernate mapping    lt hibernate-mapping package  example forms  gt       lt class name  Invoice  table  Invoices  gt           lt id name  id  type  long  gt               lt generator class  native    gt           lt  id gt           lt property name  invDate  type  timestamp    gt           lt property name  customerId  type  int    gt           lt set cascade  all  inverse  true  lazy  true  name  items  order-by  id  gt               lt key column  invoiceId    gt               lt one-to-many class  InvoiceItem    gt           lt  set gt       lt  class gt       lt class name  InvoiceItem  table  InvoiceItems  gt           lt id column  id  name  itemId  type  long  gt               lt generator class  native    gt           lt  id gt           lt property name  productId  type  long    gt           lt property name  packname  type  string    gt           lt property name  quantity  type  int    gt           lt property name  price  type  double    gt           lt many-to-one class  example forms Invoice  column  invoiceId  name  invoice  not-null  true    gt       lt  class gt   lt  hibernate-mapping gt    EDIT  InvoiceManager java  class InvoiceManager        public Long save Invoice theInvoice  throws RemoteException           Session session   HbmUtils getSessionFactory   getCurrentSession            Transaction tx   null          Long id   null          try               tx   session beginTransaction                session persist theInvoice               tx commit                id   theInvoice getId              catch  RuntimeException e                if  tx    null                  tx rollback                e printStackTrace                throw new RemoteException  Invoice could not be saved              finally               if  session isOpen                    session close                      return id             public Invoice getInvoice Long cid  throws RemoteException           Session session   HbmUtils getSessionFactory   getCurrentSession            Transaction tx   null          Invoice theInvoice   null          try               tx   session beginTransaction                Query q   session                      createQuery                               from Invoice as invoice                                  left join fetch invoice items as invoiceItems                                  where invoice id    id                         setReadOnly true               q setParameter  id   cid               theInvoice    Invoice  q uniqueResult                tx commit              catch  RuntimeException e                tx rollback              finally               if  session isOpen                    session close                      return theInvoice            Invoice java  public class Invoice implements java io Serializable        private Long id      private Date invDate      private int customerId      private Set lt InvoiceItem gt  items       public Long getId             return id             public Date getInvDate             return invDate             public int getCustomerId             return customerId             public Set lt InvoiceItem gt  getItems             return items             void setId Long id            this id   id             void setInvDate Date invDate            this invDate   invDate             void setCustomerId int customerId            this customerId   customerId             void setItems Set lt InvoiceItem gt  items            this items   items            InvoiceItem java  public class InvoiceItem implements java io Serializable        private Long itemId      private long productId      private String packname      private int quantity      private double price      private Invoice invoice       public Long getItemId             return itemId             public long getProductId             return productId             public String getPackname             return packname             public int getQuantity             return quantity             public double getPrice             return price             public Invoice getInvoice             return invoice             void setItemId Long itemId            this itemId   itemId             void setProductId long productId            this productId   productId             void setPackname String packname            this packname   packname             void setQuantity int quantity            this quantity   quantity             void setPrice double price            this price   price             void setInvoice Invoice invoice            this invoice   invoice            EDIT  JSON object sent from client     id  null  customerId  3  invDate   2005-06-07T04 00 00 000Z   items      itemId  1  productId  1  quantity  10  price  100     itemId  2  productId  2  quantity  20  price  200     itemId  3  productId  3  quantity  30  price  300      EDIT  Some details  I have tried to save invoice by following two ways    Manually fabricated above mentioned json object and passed it to fresh session of server  In this case absolutely  no activity has been made prior to calling  save method so there should not be any open session except the one opened in save method Loaded existing data by using getInvoice method and them passed same  data after removing key value  This too I believe should close the session before saving as transaction is being committed in getInvoice method    In both cases I am getting same error message that is forcing me to believe that something is wrong either with hibernate configuration file or entity classes or save method     Please let me know if I should provide more details

User · Answer

For JPA fixed using EntityManager merge   instead of persist    EntityManager em   getEntityManager        try           em getTransaction   begin            em merge fieldValue           em getTransaction   commit          catch  Exception e              do smthng       finally           em close

User · Answer

I had the  same  problem because I was writting   GeneratedValue strategy   GenerationType IDENTITY    I deleted that line due that I do not need it at the moment  I was testing with objects and so  I think it is  lt generator class  native    gt  in your case  I do not have any controller and my API is not being accessed  it is only for testing  at the moment

User · Answer

Two solutions 1  use merge if you want to update the object 2  use save if you want to just save new object  make sure identity is null to let hibernate or database generate it  3  if you are using mapping like  OneToOne fetch   FetchType EAGER cascade CascadeType ALL   JoinColumn name    stock id    Then use CascadeType ALL to CascadeType MERGE  thanks  Shahid Abbasi

User · Answer

Here you have used native and assigning value to the primary key  in native primary key is auto generated    Hence the issue is coming

User · Answer

You didn t provide many relevant details so I will guess that you called getInvoice and then you used result object to set some values and call save with assumption that your object changes will be saved    However  persist operation is intended for brand new transient objects and it fails if id is already assigned  In your case you probably want to call saveOrUpdate instead of persist    You can find some discussion and references here  quot detached entity passed to persist error quot  with JPA EJB code

User · Answer

Most likely the problem lies outside the code you are showing us here  You are trying to update an object that is not associated with the current session  If it is not the Invoice  then maybe it is an InvoiceItem that has already been persisted  obtained from the db  kept alive in some sort of session and then you try to persist it on a new session  This is not possible  As a general rule  never keep your persisted objects alive across sessions   The solution will ie in obtaining the whole object graph from the same session you are trying to persist it with  In a web environment this would mean    Obtain the session Fetch the objects you need to update or add associations to  Preferabley by their primary key Alter what is needed Save update evict delete what you want Close commit your session transaction   If you keep having issues post some of the code that is calling your service

User · Answer

This exists in  ManyToOne relation  I solved this issue by just using CascadeType MERGE instead of CascadeType PERSIST or CascadeType ALL  Hope it helps you    ManyToOne cascade   CascadeType ALL   JoinColumn name  updated by   referencedColumnName    id   private Admin admin    Solution    ManyToOne cascade   CascadeType MERGE   JoinColumn name  updated by   referencedColumnName    id   private Admin admin

[hibernate] org.hibernate.PersistentObjectException: detached entity passed to persist

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