java - TransientObjectException even if I set cascade=CascadeType.ALL -

i've 2 classes:

employee.java

@entity @table public class employee {     @id     @generatedvalue     private long id;      private string name;      @manytoone     private department department;      public employee() {}      public employee(string name, department department) {         this.name = name;         this.department = department;     }       public employee(string name) {         this.name = name;     }      public long getid() {         return id;     }      public void setid(long id) {         this.id = id;     }      public string getname() {         return name;     }      public void setname(string name) {         this.name = name;     }      public department getdepartment() {         return department;     }      public void setdepartment(department department) {         this.department = department;     }      @override     public string tostring() {         return "employee [id=" + id + ", name=" + name + ", department="                 + department.getname() + "]";     }  } 

department.java

@entity @table public class department {      @id     @generatedvalue     private long id;       private string name;      @onetomany(mappedby="department",cascade=cascadetype.all)     private list<employee> employees = new arraylist<employee>();      public department() {         super();     }     public department(string name) {         this.name = name;     }     public long getid() {         return id;     }     public void setid(long id) {         this.id = id;     }     public string getname() {         return name;     }     public void setname(string name) {         this.name = name;     }     public list<employee> getemployees() {         return employees;     }     public void setemployees(list<employee> employees) {         this.employees = employees;     } } 

then tried save department , employees in main method:

session session = hibernateutil.getsessionfactory().opensession(); session.begintransaction();  department department = new department("java"); //session.save(department); //throw org.hibernate.transientobjectexception if comment line  session.save(new employee("jakab gipsz",department)); session.save(new employee("captain nemo",department));  session.gettransaction().commit(); 

it didn't work. throwed error:

org.hibernate.transientobjectexception: object references unsaved transient instance - save transient instance before flushing: com.learn.hibernate.department 

but if uncommented line session.save(department);, worked fine. why? i've set cascade=cascadetype.all, supposed save department automatically without throwing errors. did miss anything?

when save employee, department not saved because there no cascade. if want that, need add cascade in employee class.

@manytoone(cascade = cascadetype.save) private department department;