Override Datasource definition in LocalContainerEntityManagerFactoryBean

[pgondi]

i am not able to override the datasource that was in persistence.xml with LocalContainerEntityManagerFactoryBean.
How can I re-use same persistence.xml file for test and JEE deployments? Do we need to maintain multiple copies of persistence.xml?

persistence.xml (for both test and server deployments)

<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
	<persistence-unit name="Jpa-SpringData">
		<jta-data-source>DS_TEST</jta-data-source>
                <class>entity.Employee</class>
	</persistence-unit>
</persistence>

applicationContext.xml for JUnit testing:

        <bean id="testDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
		p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}" p:username="${jdbc.username}"
		p:password="${jdbc.password}" />
	
	  <bean id="entityManagerFactory"     class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
            <property name="dataSource" ref="testDS" />
            <property name="persistenceUnitName" value="Jpa-SpringData" />
            <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.OpenJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="generateDdl" value="false" />
                <property name="database" value="ORACLE" />
            </bean>
        </property>
    </bean>

Any help is appreciated.

Thanks