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In blueprint.xml , I declare an optional dependency this way: <reference id="RepositoryListener" interface="ru.focusmedia.odp.server.datastore.api.RepositoryListener" availability="optional" /> <bean id="Repository" class="ru.focusmedia.odp.server.datastore.jpa.repository.RepositoryImpl"> <jpa:context property="entityManager" unitname="ODP_Server" /> <tx:transaction method="*" value="Required" /> <property name="repositoryListener" ref="RepositoryListener" /> </bean> and in RepositoryImpl , I have public void setRepositoryListener(RepositoryListener repositoryListener) { logger.info("Repository listener set"); this.repositoryListener = repositoryListener; } This method is called by Blueprint even when there is no RepositoryListener service available, as expected. The problem is, how can I check later whether there is a service? if (repositoryListener != null) { repositoryListener.notifyDelete(node); } else { logger.warn("No repository listener set!"); } doesn't work, since repositoryListener isn't null , but a Blueprint proxy.

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