java - Hibernate Get Detached Object in Service, alter the ID and persist again -

i have asked this question here , same. im looking different approach.

i have java spring mvc application. trying crud on 1 table, employee.

i trying object database using hibernate, changes including altering id, , save again. doing in service layer

i have following code in serviceimpl

public class employeeserviceimpl extends genericmanagerimpl<employee, long> implements employeeservice {     @override     public void saveold(long key) {         employee = (employee) employeedao.get(key);         employee.setactive(false);         employee.setempkey(null);         employeedao.save(employee);     } } 

but getting exception.

org.springframework.orm.hibernate4.hibernatesystemexception: identifier of instance of com.table.model.employee altered 4 null; nested exception org.hibernate.hibernateexception: identifier of instance of com.table.model.employee altered 4 null 

from the question told above, have option use copy constructor, copy values except key , in service set other values , save. , working.

        employee = (employee) employeedao.get(key);         employee = new employee(employee);         employee.setactive(false);         employeedao.save(employee); 

i looking different apporach. how can object detached 1 session, alter values including id , persist again? should in service layer.

thanks.

you can commons beanutils

org.apache.commons.beanutils.propertyutils.copyproperties( dest, source );

do below

    employee source = (employee) employeedao.get(key);     employee dest= new employee();     org.apache.commons.beanutils.propertyutils.copyproperties( dest, source );     dest.setid(null);     dest.setactive(false);     employeedao.save(dest);