java – Spring Data Rest：RepositoryEventHandler方法未被调用

@RepositoryRestResource(collectionResourceRel = "agents",path = "/agents")
public interface AgentRepository extends CrudRepository<Agent,Long> {
    // no implementation required; Spring Data will create a concrete Repository
}

我创建了一个AgentEventHandler：

@Component
@RepositoryEventHandler(Agent.class)
public class AgentEventHandler {

    /**
     * Called before {@link Agent} is persisted 
     * 
     * @param agent
     */
    @HandleBeforeSave
    public void handleBeforeSave(Agent agent) {

        System.out.println("Saving Agent " + agent.toString());

    }
}

并在@Configuration组件中声明它：

@Configuration
public class RepositoryConfiguration {

    /**
     * Declare an instance of the {@link AgentEventHandler}
     *
     * @return
     */
    @Bean
    AgentEventHandler agentEvenHandler() {

        return new AgentEventHandler();
    }
}

当我发布到REST资源时,实体被持久化,但是方法handleBeforeSave从未被调用.我失踪了什么

我使用的是：Spring Boot 1.1.5.RELEASE