Spring JPA using primary key within #Embeddable class - spring-data-jpa

Question

In my application i have a scenario to fetch data from entity based on give input code and date.
The combination of code and date will be unique and will return a single record.
Below is my entity
class JpaEntity
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private id ;
private String code;
private Date date;
private title;
//Getters and Setters
}
I have tried below approcah by changing the entity.
class JpaEntity
{
private String title;
//Getters and setters
#EmbededId
private EntityId entityID
#Embedable
public static class EntityId implements Serializable{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private id ;
private String code;
private Date date;
//Getters and Setters
}
}
I am using the entity to search based on code and date
public interface PersistentDAO extends JpaRepository<JpaEntity,String> {
{
#Query("SELECT cal FROM JpaCalendar cal" + " WHERE cal.calendarId.currencyCode=:currencyCode "
+ " AND cal.calendarId.date=:date")
Optional<JpaCalendar> findById(String currencyCode, Date date);
JpaEntity findByID(String code,Date date)
}
But the JPA is throwing error saying Component Id is not found.
is it mandatory all the field in #Embedable are primary?
is it possible #Embedable class (composite id) contain the both primary and non-primay keys.
Since i am not supposed to change the structure of the table is there any way to achieve following:
Fetch record based on give code and date.
Insert new record where in id the primary key should be auto incremented
Please suggest.

Answer 1

Use #Embedded & #Embeddable and don't use static class inside class
class JpaEntity
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private id ;
#Embedded
private CodeDate codeDate;
private title;
}
#Embeddable
class CodeDate {
private String code;
private Date date;
}
You can use Jpa method naming query and create a CodeDate object call like this
public interface PersistentDAO extends JpaRepository<JpaEntity,String> {
{
JpaEntity findByCodeDate(CodeDate codeDate);
}