m子流错误-消息有效载荷的类型为:byte [] [英] Error in mule flow - Message payload is of type: byte[]

问题描述

我可以使用带有有效负载的localhost URL进入名为 方法 的子流(请参见下面的代码片段). 如果必须查明，以下xpath表达式求值失败

I am able to get to the subflow named method (refer snippet below) using localhost url with a valid payload. If I had to pinpoint, following xpath expression evaluation is failing

#[xpath://Envelope/Body/add] ，错误消息是消息有效载荷的类型为:byte []

我尝试使用转换器(字节数组到字符串，字节数组到对象，对象到xml等)，但是似乎没有任何方法可以解决这个问题.

I have tried using transformers (byte-array-to-string, byte-array-to-object, object-to-xml etc.) but nothing seems to resolve this.

<flow name="version1" >
    <http:inbound-endpoint ........ />
    <set-variable variableName="req" value="#[payload:java.lang.String]"/>
    <flow-ref name="method"/>
    <catch-exception-strategy>
        <logger level="ERROR" message="Exception occurred when invoking add/update operation. The payload submitted was: #[flowVars['req']]"/>      
    </catch-exception-strategy>
</flow>

<sub-flow name="method" >   
    <choice doc:name="Choice" >
        <when expression="#[xpath://Envelope/Body/add]">
            <flow-ref name="add_v1"/>
        </when>
        <when expression="#[xpath://Envelope/Body/update]" >
            <flow-ref name="update_v1"/>
        </when>
        <otherwise>
            <scripting:component>
                <scripting:script engine="Groovy">
                    <![CDATA[throw new Exception("Operation not found!");]]>
                </scripting:script>
            </scripting:component>
        </otherwise>
    </choice>
</sub-flow>

**ERROR**

Message : Failed to invoke ScriptComponent{method.component.568157096}. Component that caused exception is: ScriptComponent{method.component.568157096}. Message payload is of type: byte[]
Code : MULE_ERROR--2

推荐答案

在流版本1中

在http入站端点之后，添加对象到字符串的转换器. xpath表达式会正确执行，而不会出现错误.

after the http inbound endpoint, add object-to-string transformer. the xpath expression evalautes with out the error.

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