spring rabbitmq 延时队列配置无效-java报错

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<code class=""language-xml""><?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:rabbit="http://www.springframework.org/schema/rabbit" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-1.7.xsd">

<!-- 连接配置 -->
<rabbit:connection-factory id="connectionFactory"
                           host="${rabbitmq.host}"
                           username="${rabbitmq.username}"
                           password="${rabbitmq.password}"
                           port="${rabbitmq.port}"
                           virtual-host="${rabbitmq.vhost}"/>

<rabbit:admin connection-factory="connectionFactory"/>

<!-- spring template声明-->
<rabbit:template id="amqpTemplate"
                 connection-factory="connectionFactory"
                 message-converter="jsonMessageConverter"/>

<!-- 消息对象json转换类 -->
<bean id="jsonMessageConverter"
      class="org.springframework.amqp.support.converter.Jackson2JsonMessageConverter"/>


<!--延迟队列：没人消费-->
<rabbit:queue name="delayQueue" durable="true">
    <rabbit:queue-arguments>
        <entry key="x-dead-letter-exchange" value="directExchange"/>
        <entry key="x-dead-letter-routing-key" value="taskRoutingKey"/>
    </rabbit:queue-arguments>
</rabbit:queue>

<!--死信队列：过期的消息会被路由到该队列，然后被消费-->
<rabbit:queue name="taskQueue" durable="true" />

<rabbit:direct-exchange name="directExchange" durable="true">
    <rabbit:bindings>
        <rabbit:binding queue="delayQueue" key="delayRoutingKey"/>
        <rabbit:binding queue="taskQueue" key="taskRoutingKey"/>
    </rabbit:bindings>
</rabbit:direct-exchange>

<bean id="messageReceiver" class="com.huweitech.service.rabbitmq.impl.MQConsumerImpl"/>

<rabbit:listener-container connection-factory="connectionFactory">
    <rabbit:listener ref="messageReceiver" queues="taskQueue"/>
</rabbit:listener-container>

</beans>

这个是我的配置，我在rabbit控制台上看到消息发出去了，但是感觉像一发出去就被丢弃了，求各位指点。