EDIT

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.core.env.ConfigurableEnvironment;

import org.springframework.core.env.MutablePropertySources;

import org.springframework.core.env.PropertiesPropertySource;

    @Bean

    public DataSource dataSource() {

        String beanName = findProperty(ATTRIBUTE_DATASOURCE_NAME, true);