Inheritance with embeddedid

Hibernate ORM
1

I am trying to define a non-abstract base class with an embeddedid like so:

@Entity @Table(name="quote")
@Inheritance(strategy = InheritanceType.JOINED)
public class Quote implements Serializable
{
    private final static long serialVersionUID = 1L;

    @EmbeddedId
    protected QuoteId id;

@Embeddable
    private static class QuoteId implements Serializable {
        private final static long serialVersionUID = 1L;
        protected String symbol;
        protected Date time;


        public QuoteId()
        {
        }

        public QuoteId(final String symbol, final Date time)
        {
            this.symbol = symbol;
            this.time = time;
        }

        public String getSymbol() {
            return this.symbol;
        }

        public void setSymbol(final String argSymbol) {
            this.symbol = argSymbol;
        }

        public Date getTime() {
            return this.time;
        }

        public void setTime(final Date argTime) {
            this.time = argTime;
        }


        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;

            QuoteId that = (QuoteId) o;

            if (!symbol.equals(that.symbol)) return false;
            return time.equals(that.time);
        }

        @Override
        public int hashCode() {
            int result = symbol.hashCode();
            result = 31 * result + time.hashCode();
            return result;
        }
    }
    // more members, etc
}

I would like to subclass the Quote class, which I currently do like so:

@Entity @Table(name="option_quote")
public class OptionQuote extends Quote implements Serializable
{

    private final static long serialVersionUID = 1L;
    protected float strike;
    protected float price;
    // more members, etc
}

I allow Hibernate to create the schema for me which in Postgres which creates a quote table and an option_quote table which both have time and symbol columns. The option_quote table has a foreign key to the quote table which references quote(symbol, time).

My main issue at the moment is that I want to create and store instances of Quote objects when it is simply a stock quote and not an option quote. When I attempt to do this, JPA stores an “empty” option_quote row as well with all the member values 0. In addition to any comments and/or corrections to my model or annotations, I am hoping someone can point me in the right direction to prevent the option_quote from being created when I am trying to only store a Quote instance.

It may be that I have to change my model (which I control) to eliminate inheritance and simply have a StockQuote and an OptionQuote or some other model change. Thanks in advance for your insight!

2

The EmbeddedId class should not be private. Move it to an outer class or make it public.

Related to your issue, you need to add the data access code you are using and the SQL log generated by Hibernate.