org hibernate TransientObjectException object references an unsaved transient instance - save the transient instance before flushing

Question

In my project I have User  Role  UserRole and BloodGroup entities  Firstly I take List lt BloodGroup gt  from DB and set to User  Then I give User and Role entites to UserRole  After that I insert User to DB  then I try to insert UserRole  but I get an error  When I look to DB  the ID of BloodGroup isn t inserted in User table   If I choose the first BloodGroup in the list  I get an error  Other options is normal   I look at the internet  I found cascade   CascadeType ALL  but this add same data to BloodGroup  which means I have more Arh  BloodGroup   The entities    Entity  Table name  USERS   public class User implements Serializable        private static final long serialVersionUID   1L        Id      GeneratedValue strategy GenerationType AUTO      private long userid        OneToMany mappedBy  user       private List lt Userrole gt  userroles         bi-directional many-to-one association to Bloodgroup      ManyToOne      JoinColumn name  BLOODGRUPID       private Bloodgroup bloodgroup          Entity public class Bloodgroup implements Serializable        private static final long serialVersionUID   1L        Id      GeneratedValue strategy GenerationType AUTO      private int bloodgroupid       private String bloodgroupname        OneToMany mappedBy  bloodgroup       private List lt User gt  users          Entity public class Userrole implements Serializable        private static final long serialVersionUID   1L        Id      GeneratedValue strategy GenerationType AUTO      private long userroleid       private Timestamp createddate       private Timestamp deleteddate       private String isactive         bi-directional many-to-one association to Role      ManyToOne      JoinColumn name  ROLEID       private Role role         bi-directional many-to-one association to User      ManyToOne      JoinColumn name  USERID       private User user       Controller   user setBloodgroup bloodGroupImpl getBloodGroupById bGroup    user setUserid userImpl insertUserProfile user    userRoleImpl insertUserRole user role     DAO   public void insertUserRole User user  Role role        Session session  getHibernateTemplate   getSessionFactory   getCurrentSession        Userrole uRole   new Userrole        uRole setIsactive  1        uRole setRole role       uRole setUser user               session save uRole       session flush                public void insertUserProfile User user        Session session   getHibernateTemplate   getSessionFactory   getCurrentSession        session save user       Log   Hibernate   insert  into     IU Userrole      userroleid  createddate  deleteddate  isactive  ROLEID  USERID   values      default                  05 Sub 2012 19 23 29 com sun faces application ActionListenerImpl processAction SEVERE  org hibernate TransientObjectException  object references an unsaved transient instance - save the transient instance before flushing  com iu eblood model Bloodgroup javax faces el EvaluationException  org hibernate TransientObjectException  object references an unsaved transient instance - save the transient instance before flushing  com iu eblood model Bloodgroup     at javax faces component MethodBindingMethodExpressionAdapter invoke MethodBindingMethodExpressionAdapter java 102      at com sun faces application ActionListenerImpl processAction ActionListenerImpl java 102      at javax faces component UICommand broadcast UICommand java 315      at javax faces component UIViewRoot broadcastEvents UIViewRoot java 775      at javax faces component UIViewRoot processApplication UIViewRoot java 1267      at com sun faces lifecycle InvokeApplicationPhase execute InvokeApplicationPhase java 82      at com sun faces lifecycle Phase doPhase Phase java 103      at com sun faces lifecycle LifecycleImpl execute LifecycleImpl java 118      at javax faces webapp FacesServlet service FacesServlet java 310      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 305      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 210      at org springframework orm hibernate3 support OpenSessionInViewFilter doFilterInternal OpenSessionInViewFilter java 198      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 76      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 243      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 210      at org springframework orm hibernate3 support OpenSessionInViewFilter doFilterInternal OpenSessionInViewFilter java 198      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 76      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 243      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 210      at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 224      at org apache catalina core StandardContextValve invoke StandardContextValve java 169      at org apache catalina authenticator AuthenticatorBase invoke AuthenticatorBase java 472      at org apache catalina core StandardHostValve invoke StandardHostValve java 168      at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 98      at org apache catalina valves AccessLogValve invoke AccessLogValve java 928      at org apache catalina core StandardEngineValve invoke StandardEngineValve java 118      at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 407      at org apache coyote http11 AbstractHttp11Processor process AbstractHttp11Processor java 987      at org apache coyote AbstractProtocol AbstractConnectionHandler process AbstractProtocol java 539      at org apache tomcat util net JIoEndpoint SocketProcessor run JIoEndpoint java 300      at java util concurrent ThreadPoolExecutor Worker runTask ThreadPoolExecutor java 886      at java util concurrent ThreadPoolExecutor Worker run ThreadPoolExecutor java 908      at java lang Thread run Thread java 662

User · Answer

I Solved this problem adding  Cascade to the  ManyToOne attribute   import org hibernate annotations Cascade  import org hibernate annotations CascadeType    ManyToOne  JoinColumn name  BLOODGRUPID    Cascade  CascadeType MERGE  CascadeType SAVE UPDATE   private Bloodgroup bloodgroup

User · Answer

your issue will be resolved by properly defining cascading depedencies or by saving the referenced entities before saving the entity that references   Defining cascading is really tricky to get right because of all the subtle variations in how they are used   Here is how you can define cascades    Entity public class Userrole implements Serializable        private static final long serialVersionUID   1L        Id      GeneratedValue strategy GenerationType AUTO      private long userroleid       private Timestamp createddate       private Timestamp deleteddate       private String isactive         bi-directional many-to-one association to Role      ManyToOne cascade   CascadeType ALL       JoinColumn name  ROLEID       private Role role         bi-directional many-to-one association to User      ManyToOne cascade   CascadeType ALL       JoinColumn name  USERID       private User user       In this scenario  every time you save  update  delete  etc Userrole  the assocaited Role and User will also be saved  updated     Again  if your use case demands that you do not modify User or Role when updating Userrole  then simply save User or Role before modifying Userrole  Additionally  bidirectional relationships have a one-way ownership   In this case  User owns Bloodgroup   Therefore  cascades will only proceed from User -  Bloodgroup   Again  you need to save User into the database  attach it or make it non-transient  in order to associate it with Bloodgroup

User · Answer

In my case setting the referenced object to NULL in my object before the merge o save method solve the problem  in my case the referenced object was  catalog  that doesn t need to be saved  because in some cases I don t have it even       fisEntryEB setCatStatesEB null         fisEntryEB  getSession   merge fisEntryEB

User · Answer

I had a similar problem and although I made sure that referenced entities were saved first it keeps failing with the same exception   After hours of investigation it turns out that the problem was because the  version  column of the referenced entity was NULL  In my particular setup i was inserting it first in an HSQLDB that was a unit test  a row like that   INSERT INTO project VALUES  1 1  2013-08-28 13 05 38   2013-08-28 13 05 38   aProject   aa  NULL  bb   dd   ee   ff   gg   ii  NULL  LEGACY   0   CREATED  NULL NULL 1  0  NULL NULL NULL NULL  0   0   NULL     The problem of the above is the version column used by hibernate was set to null  so even if the object was correctly saved  Hibernate considered it as unsaved  When making sure the version had a NON-NULL 1 in this case  value the exception disappeared and everything worked fine   I am putting it here in case someone else had the same problem  since this took me a long time to figure this out and the solution is completely different than the above

User · Answer

Instead of passing reference object passed the saved object  below is explanation which solve my issue     wrong entityManager persist role   user setRole role   entityManager persist user     right Role savedEntity  entityManager persist role   user setRole savedEntity   entityManager persist user

[java] org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing

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