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<blockquote> 1) Define Maintainer class as a Spring bean. </blockquote> Standard Spring syntax applies: <pre><code><bean id="maintainer" class="com.example.Maintainer"/> </code></pre> <blockquote> 2) Make it so that all sorts of listeners would be able to register themselves to Maintainer via XML by using addListener method. Spring doc nor Google are very generous in examples. </blockquote> This is trickier. You could use <code>MethodInvokingFactoryBean</code> to individually call <code>maintainer#addListener</code>, like so: <pre><code><bean id="listener" class="com.example.Listener"/> <bean id="maintainer.addListener" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetObject" ref="maintainer"/> <property name="targetMethod" value="addListener"/> <property name="arguments"> <list> <ref>listener</ref> <value>com.example.MyEnum</value> </list> </property> </bean> </code></pre> However, this is unwieldy, and potentially error-prone. I attempted something similar on a project, and created a Spring utility class to help out instead. I don't have the source code available at the moment, so I'll describe how to implement what I did. 1) Refactor the event types listened to into a <code>MyListener</code> interface <pre><code>public interface MyListener extends Listener { public Enum[] getEventTypes() } </code></pre> Which changes the registration method to <pre><code>public void addListener(MyListener listener) </code></pre> 2) Create Spring helper class that finds all relevant listeners in the context, and calls maintainer#addListener for each listener found. I would start with <code>BeanFilteringSupport</code>, and also implement <code>BeanPostProcessor</code> (or <code>ApplicationListener</code>) to register the beans after all beans have been instantiated.
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1. POMap of Enums and dependency injection in Spring 2.5
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