"No field named"-problem when using subclass field in where-clause

[Joakim Olsson <ar...@lingonpaj.com>]

Hi all,

I have a problem when trying to find objects of a base-class by using a
field from one of the subclasses in the where-clause.

The error I get is a 'No field named "xxx" in class "yyy"'. Hibernate
resolves this kind of query but OpenJPA obviously does not.

Example:

Base-class:
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
@DiscriminatorColumn(name = "type", discriminatorType =
DiscriminatorType.STRING)
public class Consumer extends AbstractBaseEntity {
	@Id
	private Long id;

	public Long getId() {
		return this.id;
	}

	public void setId(Long id) {
		this.id = id;
	}
}

Subclass 1:
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
@DiscriminatorValue("Person")
public class Person extends Consumer {
	private String firstName;
	private String lastName;

	public String getFirstName() {
		return this.firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return this.lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
}

Subclass 2:
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;

@Entity
@DiscriminatorValue("Organisation")
public class Organisation extends Consumer {
	private String legalName;

	public String getLegalName() {
		return this.legalName;
	}

	public void setLegalName(String legalName) {
		this.legalName = legalName;
	}
}

Query:
Select c From Consumer c Where c.firstName = ?1

Is there a way to make OpenJPA understand my query?

Regards,
Joakim