title: Multiple Spring PropertyPlaceholderConfigurer at the same time
body: <p>I have two projects, one of them (Services) includes the second one (Core). I've defined this PropertyPlaceholderConfigurer below within Core project: </p>
  
  <pre><code>&lt;bean id="propertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer"&gt;
      &lt;property name="locations"&gt;
           &lt;list&gt;
               &lt;value&gt;classpath:appConfig.properties&lt;/value&gt;
           &lt;/list&gt;
      &lt;/property&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>And I want to extend the Core placeholder in the upper project, including appConfig.properties and some other ones. The only way I found is to define another different bean (different ID) in the upper level and include the new ones: </p>
  
  <pre><code>&lt;bean id="servicesPropertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer"&gt;
      &lt;property name="locations"&gt;
            &lt;list&gt;
                  &lt;value&gt;classpath:swagger.properties&lt;/value&gt;
            &lt;/list&gt;
      &lt;/property&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>But it yields it cannot find appConfig.properties, I guess it's only using one of these PropertyPlaceholderConfigurer at the same time? Is it necesary to specify all resources in the upper propertyConfigurer?:</p>
  
  <pre><code>&lt;bean id="servicesPropertyConfigurer" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer"&gt;
      &lt;property name="locations"&gt;
            &lt;list&gt;
                  &lt;value&gt;classpath:swagger.properties&lt;/value&gt;
                  &lt;value&gt;classpath:appConfig.properties&lt;/value&gt;
            &lt;/list&gt;
      &lt;/property&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>Is it posible to extend the Core bean o use both at the same time?</p>