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    <p>Both <code>map</code> and <code>list</code> has this attribute named <code>merge=true|false</code> for merging two lists. Alternatively you can use <code>MethodInvokingFactoryBean</code> for calling already defined list's add method to add extra items later.</p> <p>Let's go over your example. </p> <p>1) First the second scenario with <code>MethodInvokingFactoryBean</code>. Instead of defining the way you do, I defined your beans a little differently.</p> <pre><code>&lt;bean class="java.util.HashMap" id="exampleMapping"&gt; &lt;constructor-arg index="0"&gt; &lt;map&gt; &lt;entry key="theKey" value="theValue"/&gt; &lt;/map&gt; &lt;/constructor-arg&gt; &lt;/bean&gt; &lt;bean id="exampleService" class="com.stackoverflow.example.ExampleService"&gt; &lt;property name="mapping" ref="exampleMapping"/&gt; &lt;/bean&gt; </code></pre> <p>In another application content file, you can do the following to extend the map.</p> <pre><code>&lt;bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"&gt; &lt;property name="targetObject" ref="exampleMapping"/&gt; &lt;property name="targetMethod" value="putAll"/&gt; &lt;property name="arguments"&gt; &lt;list&gt; &lt;map id="exampleMapping"&gt; &lt;entry key="theKey2" value="theValue2"/&gt; &lt;entry key="theKey3" value="theValue3"/&gt; &lt;map&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>2) Now the first scenario. For this one, I just found something on page <a href="http://forum.springsource.org/showthread.php?t=53358" rel="noreferrer">http://forum.springsource.org/showthread.php?t=53358</a></p> <pre><code>&lt;bean id="commonData" class="A"&gt; &lt;property name="map"&gt; &lt;util:map&gt; &lt;entry key="1" value="1"/&gt; &lt;/util:map&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="data" class="A" parent="commonData"&gt; &lt;property name="map"&gt; &lt;util:map merge="true"&gt; &lt;entry key="2" value="2"/&gt; &lt;/util:map&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>Hope it helps.</p>
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    1. POHow to extend already defined lists and maps in Spring application context?
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    1. COCan you provide a simple example? Unfortunately I don't get it running.
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    2. COI updated the answer and gave an example for both of the options.
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    3. COI think the first scenario isn't a great design for this approach and sounds very dirty to me. The second one is a bit obfuscating, I think writing a registry as skaffmann mentioned will be the best. Thank you for your answer and explanation!
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