java - Hibernate : object references an unsaved transient instance - save the transient instance before flushing -


i receive following error when try list using hibernate + postgresql

myobject:

@entity @table(name = "my_objects", schema = "public") public class myobject implements java.io.serializable {  private static final long serialversionuid = 1l; @id @column(name = "my_object_id", unique = true, nullable = false) @generatedvalue private long myobjectid;  @manytoone(cascade = cascadetype.all, fetch = fetchtype.lazy) @joincolumn(name = "owner_id") private user user;  @column(name = "scheme_zone_name", length = 150) private string schemezonename;  @temporal(temporaltype.date) @column(name = "create_dt", length = 13) private date createdt;  @column(name = "comment", length = 250) private string comment;   public myobject() { }  public myobject(long myobjectid) {     this.myobjectid = myobjectid; }  public myobject(long myobjectid, user user,  string myobjectname, date createdt, string) {     this.schemezoneid = schemezoneid;     this.user = user;     this.myobjectname = myobjectname;     this.createdt = createdt;     this.comment = comment; } ....getters/setters .....}

user :

@entity @table(name = "dp_users", schema = "public") public class user implements java.io.serializable {  private static final long serialversionuid = 1l; @id @column(name = "user_id", unique = true, nullable = false, precision = 5, scale = 0) @generatedvalue private int userid;  @column(name = "user_login", nullable = false, length = 25) private string userlogin;  @column(name = "user_password", nullable = false, length = 25) private string userpassword;  @onetomany(cascade = cascadetype.all, fetch = fetchtype.lazy, mappedby = "user") private set<myobject> myobjects = new hashset(0);  public user() { }  public user(int userid, string userlogin, string userpassword) {     this.userid = userid;     this.userlogin = userlogin;     this.userpassword = userpassword; }  public user(int userid, string userlogin, string userpassword, set<myobject> myobjects) {     this.userid = userid;     this.userlogin = userlogin;     this.userpassword = userpassword;     this.myobjects = myobjects; } ....getters/setters .....}

at first user , save in user object:

public user login(string login, string password) {     session session = null;     try {         session = hibernateutil.getsessionfactory().opensession();         return (user) session.createcriteria(user.class)                 .add(restrictions.eq("userlogin", login).ignorecase())                 .add(restrictions.eq("userpassword", password)).uniqueresult();     } catch (exception e) {         e.printstacktrace();     } {         if (session != null && session.isopen()) {             session.close();         }     }     return null; }

then, when try list of myobject user :

public list<myobject> getmyobjects(user user) throws sqlexception {     list<myobject> o = null;     session session = null;     try {         session = hibernateutil.getsessionfactory().opensession();         o = session.createcriteria(myobject.class)                 .add(restrictions.eq("user", user))                 .addorder(order.asc("myobjectname"))                 .list();     } catch (exception e) {         e.printstacktrace();     } {         if (session != null && session.isopen()) {             session.close();         }     }     return o; }

i receive 

org.hibernate.transientobjectexception: object references unsaved transient instance - save transient instance before flushing: cc.testproject.common.user

what have done wrong?

you should use same session retrieve entities. session scope must match unit of work, don't instantiate each operation.

see struggling understand entitymanager proper use


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