Mule esb 和 Transform 消息（波形变换组件）

Question

我在使用我不理解的转换消息组件和 mule ESB 时遇到问题。 我有一个工作正常的简单流程，一开始是 Http 端点，最后是转换消息组件，将一个 JSON 转换为另一个。

现在，当我尝试在将消息转换为变量之前存储有效负载，然后将有效负载设置为该变量时，我在转换消息组件上遇到异常： 类型不匹配 找到 :name, :string 需要：名称，：对象（com.mulesoft.weave.engine.ast.dynamic.DynamicDispatchException） com.mulesoft.weave.engine.ast.dynamic.DynamicDispatchNode:65 (null)

这是一个有效的流程，下面是无效的流程。 有效的流程：

<mule xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8085" doc:name="HTTP Listener Configuration"/>
    <flow name="testFlow">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/test" doc:name="HTTP"/>
        <byte-array-to-string-transformer doc:name="Byte Array to String"/>
        <dw:transform-message metadata:id="b8a77df6-4692-4c52-b572-b6a175e7467e" doc:name="Transform Message">
            <dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
    id: payload.transfer-id,
    created-record-status: 'accepter'
}]]></dw:set-payload>
        </dw:transform-message>
    </flow>
</mule>

不工作的流程>

<mule xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8085" doc:name="HTTP Listener Configuration"/>
    <flow name="testFlow">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/test" doc:name="HTTP"/>
        <byte-array-to-string-transformer doc:name="Byte Array to String"/>
        <set-variable variableName="OriginalPayload" value="#[payload]" doc:name="Variable"/>
        <set-payload value="#[flowVars.OriginalPayload]" doc:name="Set Payload"/>
        <dw:transform-message metadata:id="b8a77df6-4692-4c52-b572-b6a175e7467e" doc:name="Transform Message">
            <dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
    id: payload.transfer-id,
    created-record-status: 'accepter'
}]]></dw:set-payload>
        </dw:transform-message>
    </flow>
</mule>

当我在转换之前将记录器记录到有效负载时，两个流程中的记录都是相同的...... 谁能告诉我我做错了什么？

谢谢伊万。

Answer 1

由于设置的有效负载缺少 mime 类型，因此使用下面的 xml 会出现错误，我已经测试并且它工作正常。<set-payload value="#[flowVars.OriginalPayload]" doc:name="Set Payload" mimeType="application/json"/>

<mule xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd">
    <http:listener-config name="HTTP_Listener_Confi" host="localhost" port="8085" doc:name="HTTP Listener Configuration"/>
    <flow name="testFlow">
        <http:listener config-ref="HTTP_Listener_Confi" path="/test" doc:name="HTTP"/>
        <byte-array-to-string-transformer doc:name="Byte Array to String"/>
        <logger message="#[payload]" level="INFO" doc:name="Logger"/>
        <set-variable variableName="OriginalPayload" value="#[payload]" doc:name="Variable"/>
        <set-payload value="#[flowVars.OriginalPayload]" doc:name="Set Payload" mimeType="application/json"/>
        <dw:transform-message metadata:id="b8a77df6-4692-4c52-b572-b6a175e7467e" doc:name="Transform Message">
            <dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
    id: payload.transfer-id,
    created-record-status: 'accepter'
}]]></dw:set-payload>
        </dw:transform-message>
    </flow>
</mule>