spring datasource config with default transaction isolation

gistfile1.xml

	<bean id="datasource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="${db.driverClass}" />
		<property name="url" value="${db.connectionURL}" />
		<property name="username" value="${db.user.username}" />
		<property name="password" value="${db.user.password}" />
        <property name="validationQuery" value="${db.connection.validationQuery}"/>
        <property name="testOnBorrow" value="${db.connection.testOnBorrow}"/>
        <property name="defaultTransactionIsolation" value="2"/>
	</bean>