I am using @OneToOne Relation ship(Bi-directional)
Parent
@Entity
@Table(name="student")
public class Student {
@Id
@GeneratedValue

private int sno;

@Column(name="name")
private String name;
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name="sno",unique=true,nullable=false)
private Address address;
//setters and getters

Child:
@Id
@GeneratedValue(generator="gen")
@GenericGenerator(name = "gen", strategy = "foreign",parameters= @Parameter(name = "property", value = "student"))

private int sno;

@Column(name="state")
private String state;
@OneToOne(cascade=CascadeType.ALL)
@PrimaryKeyJoinColumn
private Student student;
//setters and getters
.when i am calling save(Parent) it throws the following exception::
exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [info.inetsolv.models.Address.student]
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:927)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:822)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
root cause

org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [info.inetsolv.models.Address.student]
org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:102)


When i am calling save(Child) it is working fine

please help me.i want to save records by claaing save(parent)