Hibernate + Transação em 2 bancos diferentes. XA transaction?

<datasources>
        <xa-datasource>
                <jndi-name>localhost</jndi-name>
                <track-connection-by-tx/>
                <isSameRM-override-value>false</isSameRM-override-value>
                <xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class>
                <xa-datasource-property name="URL">jdbc:mysql://localhost/teste</xa-datasource-property>
                <xa-datasource-property name="User">XXXXX</xa-datasource-property>
                <xa-datasource-property name="Password">YYYYY</xa-datasource-property>
                <min-pool-size>5</min-pool-size>
            <max-pool-size>100</max-pool-size>
            <blocking-timeout-millis>5000</blocking-timeout-millis>
            <idle-timeout-minutes>15</idle-timeout-minutes>
                <metadata>
                        <type-mapping>mySQL</type-mapping>
                </metadata>
    </xa-datasource>
    <xa-datasource>
          ..............
    </xa-datasource>
</datasources>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd"
	default-autowire="byName">
	
	<bean id="entityManagerFactory"
		class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="persistenceUnitName" value="NOME_DO_UNIT_NAME" />
		<property name="jpaProperties">
			<props>
				<prop key="hibernate.transaction.factory_class">org.hibernate.ejb.transaction.JoinableCMTTransactionFactory </prop>
				<prop key="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</prop>
			</props>
		</property>
	</bean>
	<bean id="transactionManager"
		class="org.springframework.transaction.jta.JtaTransactionManager"
		autowire="no">
		<property name="transactionManagerName" value="java:/TransactionManager" />
		<property name="userTransactionName" value="UserTransaction" />
	</bean>
	<tx:annotation-driven transaction-manager="transactionManager" />
	<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE datasources
    PUBLIC "-//JBoss//DTD JBOSS JCA Config 1.5//EN"
    "http://www.jboss.org/j2ee/dtd/jboss-ds_1_5.dtd">
<datasources>

	<xa-datasource>
		<jndi-name>ExemploSeamDatasource2</jndi-name>
		<track-connection-by-tx />
		<isSameRM-override-value>false</isSameRM-override-value>
		<xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class>
		<xa-datasource-property name="URL">jdbc:mysql://localhost:3306/exemploseam2</xa-datasource-property>
		<xa-datasource-property name="User">xxx</xa-datasource-property>
		<xa-datasource-property name="Password">xxx</xa-datasource-property>
		<min-pool-size>5</min-pool-size>
		<max-pool-size>100</max-pool-size>
		<blocking-timeout-millis>5000</blocking-timeout-millis>
		<idle-timeout-minutes>15</idle-timeout-minutes>
		<metadata>
			<type-mapping>mySQL</type-mapping>
		</metadata>
	</xa-datasource>

	<xa-datasource>
		<jndi-name>GenericXADS</jndi-name>
		<xa-datasource-class>[fully qualified name of class implementing
			javax.sql.XADataSource goes here]</xa-datasource-class>
		<xa-datasource-property name="SomeProperty">SomePropertyValue</xa-datasource-property>
		<xa-datasource-property name="SomeOtherProperty">SomeOtherValue</xa-datasource-property>

		<user-name>x</user-name>
		<password>y</password>
		<transaction-isolation>TRANSACTION_SERIALIZABLE</transaction-isolation>

		<!--pooling parameters-->
		<min-pool-size>5</min-pool-size>
		<max-pool-size>100</max-pool-size>
		<blocking-timeout-millis>5000</blocking-timeout-millis>
		<idle-timeout-minutes>15</idle-timeout-minutes>
		<!--
			sql to call when connection is created <new-connection-sql>some
			arbitrary sql</new-connection-sql>
		-->

		<!--
			sql to call on an existing pooled connection when it is obtained from
			pool <check-valid-connection-sql>some arbitrary
			sql</check-valid-connection-sql>
		-->

		<!-- pooling criteria.  USE AT MOST ONE-->
		<!--
			If you don't use JAAS login modules or explicit login
			getConnection(usr,pw) but rely on user/pw specified above, don't
			specify anything here
		-->

		<!-- If you supply the usr/pw from a JAAS login module -->
		<security-domain />

		<!--
			if your app supplies the usr/pw explicitly getConnection(usr, pw)
		-->
		<application-managed-security />

	</xa-datasource>
</datasources>