Spring + hibernate one to one mapping - spring

Question

I am developing web application using spring and hibernate. I am using one to one mapping between two tables employee and PersonelDetails.
below are my bean classes
=======================Employee=====================================
#Entity
#Table(name="employee")
public class Employee {
#Id
#Column
#GeneratedValue
private int empid;
#Column
private String firstName;
#Column
private String lastName;
#Column
private String email;
#Column
private String password;
#Column
private boolean isAdmin;
#Column
private boolean isActive;
#Column
private boolean isLocked;
//getter setters
====================PersonalDetails class====================
#Entity
#Table(name="PersonalDetails")
public class PersonalDetails {
#Column
#Id
private int empid;
#Column
private String personalEmail;
#Column
private String mob;
#Column
private String permenantAdress;
#Column
private String currentAddress;
#Column
private String gender;
#Column
private String maritialStatus;
#MapsId
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "empid", referencedColumnName = "empid")
#ForeignKey(name="empid")
private Employee employee;
//getter setters
In my application table employee is filled by Admin user while creating new employee after that employyee himself fill personalDetails table by login to his accountCreated by Admin)
Now when I try to send personal details bean to hibernate layer first I have to get the employee bean from employee table then call setEmployee method over personalDetails class and save employee bean in personalDetails and send to hibernate layer for saving in database.
So while getting employee bean from database and again send back through personalDetails bean leads to a performance issue.
Can anyone help here to clarify while saving data in child table(PersonalDetails) is it really mandatory to pass parent object(Employee) ?
=======================code to store personalDetails===============
#RequestMapping(value="addpersonal")
public ModelAndView addPersonalDetails(#ModelAttribute("personalDetails") PersonalDetails personalDetails) {
//personalDetails.setEmpid(1);
personalDetails.setCurrentAddress("niljyoti");
personalDetails.setMob("9405715872");
personalDetails.setPermenantAdress("address");
Employee e = empService.getEmployeebyUserName(uname);
personalDetails.setEmployee(e);
personalDetailsService.addPersonalDetails(personalDetails);
return new ModelAndView("home");
}

Answer 1

On read:
You can change fetch strategy if you are worried.
Based od JPA spec, default fetch type for #OneToOne is EAGER.
By setting fetch = FetchType.LAZY, instead of real PersonalDetails object, an object of a subclass behaving as a proxy is returned. Hence, selecting from employee table starts only after getEmployee is called.
On write:
You need to specify connection between entities, in your model, the only way is the employee field. However, you can specify mappedBy, see answer to this question:
Java: Hibernate #OneToOne mapping