Spring Boot + Spring Data JPA + Spring Data REST + orm.xml = retrofitting pre-existing POJOs for REST API use

Application.java

@SpringBootApplication
@RestController
public class Application {

    @Configuration
    public static class HibernateConfiguration extends HibernateJpaAutoConfiguration {
        @Bean
        @Override
        public LocalContainerEntityManagerFactoryBean entityManagerFactory(
                EntityManagerFactoryBuilder factoryBuilder)
        {
            final LocalContainerEntityManagerFactoryBean ret = super.entityManagerFactory(factoryBuilder);
            ret.setMappingResources("orm.xml");
            return ret;
        }
    }

orm.xml

<?xml version="1.0" encoding="UTF-8" ?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"
                 version="2.0">

    <entity class="org.springframework.social.twitter.api.Tweet" access="FIELD">
        <table name="tweets"/>
        <attributes>
            <id name="id">
                <generated-value strategy="AUTO"/>
            </id>
            <basic name="text">
                <column name="text" length="200"/>
            </basic>
            <basic name="createdAt">
                <column name="created_at" column-definition="TIMESTAMP" />
            </basic>
            <basic name="fromUser">
                <column name="from_user" length="200"/>
            </basic>
            <basic name="profileImageUrl">
                <column name="profile_image_url" length="200"/>
            </basic>
            <basic name="toUserId">
                <column name="to_user_id" column-definition="INTEGER"/>
            </basic>
        </attributes>
    </entity>

</entity-mappings>

TweetRepository.java

package io.mikael.demo;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.social.twitter.api.Tweet;

public interface TweetRepository extends JpaRepository<Tweet, Long> {

}