将JPA实体与特定于Hibernate的调整分开

@Entity
//@GenericGenerator(name="system-uuid",strategy="org.hibernate.id.UUIDGenerator")
public class Node extends PersistentEntity {
    private UUID id;
    private String name;
    private String displayName;

    @Id
    @GeneratedValue
    //@GeneratedValue(generator="system-uuid") //instead of above line
    //@Type(type = "pg-uuid")
    public UUID getId() { return id; }

    public String getName() { return name; }

    public String getDisplayName() { return displayName; }

    //stuff omitted
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="package">
    <class name="Node">
        <id name="id" type="pg-uuid">
            <generator class="org.hibernate.id.UUIDGenerator"/>
        </id>
    </class>
</hibernate-mapping>

@Entity
public class Host extends Node {
    //fields, getters, fluff
}

org.hibernate.DuplicateMappingException: Duplicate class/entity mapping Node

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
    <persistence-unit name="myPU" transaction-type="JTA">
        <jta-data-source>java:/my-postgresql-DS</jta-data-source>
        <mapping-file>META-INF/hbm.xml</mapping-file>
        <!-- shouldnt need to list classes here since this is deployed -->
        <!-- in the same jar as the classes and scanning should work   -->
        <validation-mode>AUTO</validation-mode>
        <properties>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
        </properties>
    </persistence-unit>
</persistence>