java - could not set a field value by reflection setter of <class> -

have seen similar question in forum, here mapping value in junction table & hibernate.propertyaccessexception: not set field value reflection setter
i've applied solution mentioned in question still facing same problem. don't know missing. classes -

employeeid.java

@idclass(value = employeeid.class) public class employeeid implements serializable{      private int empid;     private int deptid;      public employeeid() {      }      public employeeid(int empid, int deptid) {         this.empid = empid;         this.deptid = deptid;     }      public int getempid() {         return empid;     }      public int getdeptid() {         return deptid;     }      @override     public int hashcode() {         final int prime = 31;         int result = 1;         result = prime * result + deptid;         result = prime * result + empid;         return result;     }     @override     public boolean equals(object obj) {         if (this == obj)             return true;         if (obj == null)             return false;         if (getclass() != obj.getclass())             return false;         employeeid other = (employeeid) obj;         if (deptid != other.deptid)             return false;         if (empid != other.empid)             return false;         return true;     }   } 

employee.java

@entity(name="employee") @idclass(value = employeeid.class) public class employee {      @id @generatedvalue     @column(name="emp_id")     private int empid;      @id @generatedvalue     @column(name="dept_id")     private int deptid;      public int getempid() {         return empid;     }     public void setempid(int empid) {         this.empid = empid;     }     public int getdeptid() {         return deptid;     }     public void setdeptid(int deptid) {         this.deptid = deptid;     }      @column(name="emp_name")     private string empname;      public string getempname() {         return empname;     }     public void setempname(string empname) {         this.empname = empname;     } } 

and test code -

try {             employee emp = new employee();             emp.setempname("new employee");              session session = factory.opensession();             session.begintransaction();              session.save(emp);              session.gettransaction().commit();             session.close();         } catch (exception e) {             e.printstacktrace();         } {             factory.close();         } 

on running test code exception trace -

org.hibernate.propertyaccessexception: not set field value reflection setter of employeeid.deptid     @ org.hibernate.property.directpropertyaccessor$directsetter.set(directpropertyaccessor.java:134)     @ org.hibernate.mapping.component$valuegenerationplan.execute(component.java:441)     @ org.hibernate.id.compositenestedgeneratedvaluegenerator.generate(compositenestedgeneratedvaluegenerator.java:121)     @ org.hibernate.event.internal.abstractsaveeventlistener.savewithgeneratedid(abstractsaveeventlistener.java:117)     @ org.hibernate.event.internal.defaultsaveorupdateeventlistener.savewithgeneratedorrequestedid(defaultsaveorupdateeventlistener.java:209)     @ org.hibernate.event.internal.defaultsaveeventlistener.savewithgeneratedorrequestedid(defaultsaveeventlistener.java:55)     @ org.hibernate.event.internal.defaultsaveorupdateeventlistener.entityistransient(defaultsaveorupdateeventlistener.java:194)     @ org.hibernate.event.internal.defaultsaveeventlistener.performsaveorupdate(defaultsaveeventlistener.java:49)     @ org.hibernate.event.internal.defaultsaveorupdateeventlistener.onsaveorupdate(defaultsaveorupdateeventlistener.java:90)     @ org.hibernate.internal.sessionimpl.firesave(sessionimpl.java:715)     @ org.hibernate.internal.sessionimpl.save(sessionimpl.java:707)     @ org.hibernate.internal.sessionimpl.save(sessionimpl.java:702)     @ compositekeydemo.main(compositekeydemo.java:15) caused by: java.lang.illegalargumentexception: can not set int field employeeid.deptid org.hibernate.id.identifiergeneratorhelper$2     @ sun.reflect.unsafefieldaccessorimpl.throwsetillegalargumentexception(unsafefieldaccessorimpl.java:164)     @ sun.reflect.unsafefieldaccessorimpl.throwsetillegalargumentexception(unsafefieldaccessorimpl.java:168)     @ sun.reflect.unsafeintegerfieldaccessorimpl.set(unsafeintegerfieldaccessorimpl.java:98)     @ java.lang.reflect.field.set(field.java:741)     @ org.hibernate.property.directpropertyaccessor$directsetter.set(directpropertyaccessor.java:122)     ... 12 more 

am doing silly.

in advance !!

i don't think can use @generatedvalue @idclass.