hi,
I am having some problem saving an object that contains an object that is already saved in the database. e.g. I have a class A that has a Code. These codes are entered earlier and whenever an object of type A is made, an object of type Code is assigned to it.

@Entity(access=AccessType.FIELD)
public class A

{

@OneToOne(fetch=FetchType.EAGER, cascade={CascadeType.MERGE, CascadeType.PERSIST})})
@JoinColumn(name="CodeID")
private Code code;


public void setCode(Code c)
{
this.code = c;
}

public Code getCode()
{
return this.code ;
}

}

@Entity(access=AccessType.FIELD)
public class Code
{
String description;
String codeNumber;


}

The problem is that when i save object of class A, it gives me an exception of duplicate entry for the object of code

what am i doing wrong?? kindly reply asap if you know the solution..

What is the identifier for code and how H is supposed to know if it needs to save/update/do-nothing with your object.

I do not see something like this
@Id(generate=GeneratorType.IDENTITY)
public Long getId() { ... }

Or perhaps for Code it should be something like:

@Id( generate=GeneratorType.NONE)
String getCodeNumber()

yeah, the id for both classes are generated using the AUTO strategy.. i forgot to add it here.. here is the modified code.. i am still having the same problem... if any one knows the answer kindly let me know..

@Entity(access=AccessType.FIELD)
public class A

{

@Id(generate=GeneratorType.AUTO)
private Integer id;


@OneToOne(fetch=FetchType.EAGER, cascade={CascadeType.MERGE, CascadeType.PERSIST})})
@JoinColumn(name="CodeID")
private Code code;

public Integer getId()
{
return id;
}

public void setCode(Code c)
{
this.code = c;
}

public Code getCode()
{
return this.code ;
}

}

@Entity(access=AccessType.FIELD)
public class Code
{
String description;
String codeNumber;

@Id(generate=GeneratorType.AUTO)
private Integer id;


public Integer getId()
{
return id;
}

}