Overriding one properties file with another optional properties file in Spring. Properties will be first searched in /path/local/config.properties and if not found, in classpath:config.properties

gistfile1.xml

<bean id="propertyConfigurer"       class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath:config.properties</value>
            <value>file:/path/local/config.properties</value>
        </list>
    </property>
    <property name="ignoreResourceNotFound" value="true" />
</bean>