<bean id=“configurer1" class=“org.springframework.beans.factory.config.PropertyPlaceholderConfigurer”>
     <property name="location" value="file:${catalina.base}/conf/config1.properties"/>
     <property name="ignoreUnresolvablePlaceholders" value="true"/>
</bean>

<bean id="customConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
     <property name="location" value="file:${catalina.base}/conf/config2.properties"/>
     <property name="ignoreUnresolvablePlaceholders" value="true"/>
     <property name="valueSeparator" value="-defVal-"/>
</bean>

<bean id="attachmentClient" class="com.aj.commons.client.attachmentClient">
     <property name="declaredProp" value="${declaredPropVal-defVal-defaultValue1}"/>
     <property name="undeclaredProp" value="${undeclaredPropVal-defVal-defaultValue2}"/>
</bean>