ServiceListener.java

public class ServiceListener {

    public void bindService(MyService service) {
    }

    public void unbindService(MyService service) {
    }
}

// with configuration 

<bean id="listener" class="ServiceListener" />

<ref-list interface="MyService.class">
    <reference-listener ref="listener"
                        bind="bindService"
                        unbind="unbindService" />
</ref-list>