Mule请求回复和回滚异常策略

我有一个mule流，在这里我配置了请求-应答范围。流程如下所示：

<flow name="RequestReplyFlow">
    <http:listener config-ref="HTTP_Listener_Configuration" path="/test" doc:name="HTTP" />
    <set-payload value="#['Sample Payload']" doc:name="Set Payload" />
    <request-reply doc:name="Request-Reply">
        <vm:outbound-endpoint exchange-pattern="one-way" path="request" doc:name="VM" />
        <vm:inbound-endpoint exchange-pattern="one-way" path="reply" doc:name="VM" />
    </request-reply>
</flow>

及

我在

请求

VM入站端点上配置

回滚异常策略

当组件org.ram.BusinessComponent抛出异常时，我所期望的是消息被重新传递到入站VM端点，但它没有发生。为什么?

---

有人能解决这个问题吗？

如果您使用的是回滚异常策略而不是默认的异常策略，那么您只需在“回滚异常策略”中手动指定重定向，方法是添加带有“回复”路径的“vm:出站端点”，注意MaxRedeliveryAttentits已更改为“0”因为您的vm不是事务性的：

<flow name="RequestReplyFlow1">
    <vm:inbound-endpoint exchange-pattern="one-way" path="request" doc:name="VM" />
    <logger message="Executing with payload: #[payload]" level="INFO" doc:name="Logger" />
    <component class="org.ram.BusinessComponent" doc:name="Java" />
    <rollback-exception-strategy maxRedeliveryAttempts="0" doc:name="Rollback Exception Strategy">
        <logger message="Will attempt redelivery" level="INFO" doc:name="Logger" />
        <vm:outbound-endpoint exchange-pattern="one-way" path="reply" doc:name="VM" />
    </rollback-exception-strategy>
</flow>

当vm为时，值maxredeliveryattens=5是有意义的，因为在这种情况下，Mule尝试消息重新传递五（5）次。然后，您可以在“回滚异常策略”中手动指定重定向，方法是添加“vm:outbound endpoint”，并在“超过重新交付尝试次数”子元素中添加“reply”路径：

<flow name="RequestReplyFlow1">
    <vm:inbound-endpoint exchange-pattern="one-way" path="request" doc:name="VM" />
    <logger message="Executing with payload: #[payload]" level="INFO" doc:name="Logger" />
    <component class="org.ram.BusinessComponent" doc:name="Java" />
    <rollback-exception-strategy maxRedeliveryAttempts="0" doc:name="Rollback Exception Strategy">
        <logger message="Will attempt redelivery" level="INFO" doc:name="Logger" />
        <on-redelivery-attempts-exceeded>
            <logger message="redelivery attempt exceeded" level="INFO" doc:name="Logger" />
            <vm:outbound-endpoint exchange-pattern="one-way" path="reply" doc:name="VM" />
        </on-redelivery-attempts-exceeded>
    </rollback-exception-strategy>
</flow>

<flow name="RequestReplyFlow1">
    <vm:inbound-endpoint exchange-pattern="one-way" path="request" doc:name="VM" />
    <logger message="Executing with payload: #[payload]" level="INFO" doc:name="Logger" />
    <component class="org.ram.BusinessComponent" doc:name="Java" />
    <rollback-exception-strategy maxRedeliveryAttempts="0" doc:name="Rollback Exception Strategy">
        <logger message="Will attempt redelivery" level="INFO" doc:name="Logger" />
        <on-redelivery-attempts-exceeded>
            <logger message="redelivery attempt exceeded" level="INFO" doc:name="Logger" />
            <vm:outbound-endpoint exchange-pattern="one-way" path="reply" doc:name="VM" />
        </on-redelivery-attempts-exceeded>
    </rollback-exception-strategy>
</flow>