With JPA it is quite easy to persist java classes (POJOs) directly in a database.
But what if those java classes uses java interfaces (maybe they are called POJI -plain old java interfaces-?) to access their attributes and associations. I know that a targetEntity could be specified at the relationship annotation, but this only works if there is a one-to-one correlation between the interface and the implementing class.
Can JPA deal with situations where there are two classes implementing the same interface without having a common superclass?
[i]Example code for Container.class:[/i]
package com.innoq.cn.persistence;
import javax.persistence.*;
@Entity
public class ContainerClass {
@Id
@GeneratedValue
private int id;
@OneToOne(cascade=CascadeType.PERSIST, [b]targetEntity=ClassOne.class[/b])
private Interface interfaceBase;
public Interface getInterface() { return interfaceBase; }
public void setInterface(Interface interfaceBase) { this.interfaceBase = interfaceBase; }
}
[i]Example code for Interface.java:[/i]
package com.innoq.cn.persistence;
public interface Interface {
public String getName();
public void setName(String name);
}
[Message sent by forum member 'neumann5' (neumann5)]
http://forums.java.net/jive/thread.jspa?messageID=220592