过滤介质在 WSO2 EI 6.6 中无法正常工作

Question

I'm trying to handle the response in the out sequence by using filter mediator with condition as (Vin number Updated Successfully) if it's satisfy Then block needs to be excluded but instead of Then block the else block is executed so Please tell me what did I mistaken in the below mentioned code. Thanks!

 <outSequence>
        <log level="custom">
            <property expression="json-eval($.)" name="===Response from COMS==="/>
        </log>
        <log level="custom">
            <property expression="json-eval($)" name="ComsResponse"/>
        </log>
        <property expression="json-eval($.ComsResponse)" name="Response" scope="default" type="STRING"/>
        <filter regex="Vin number Updated Successfully" source="$ctx:Response">
            <then>
                <payloadFactory description="Form Response Payload" media-type="json">
                    <format>{"StatusCode":"$1","Message":"$2"}</format>
                    <args>
                        <arg value="200"/>
                        <arg value="Updated Sucessfully"/>
                    </args>
                </payloadFactory>
            </then>
            <else>
                <payloadFactory description="Form Response Payload" media-type="json">
                    <format>{"StatusCode":"$1","Message":"$2"}</format>
                    <args>
                        <arg value="400"/>
                        <arg value="Unable to Created or Vin Number already exist"/>
                    </args>
                </payloadFactory>
            </else>
        </filter>
        <respond/>
        <property description="HTTPStatusCode" name="HTTP_SC" scope="axis2" type="STRING" value="200"/>
        <property description="HttpMessageType" name="messageType" scope="axis2" type="STRING" value="application/json"/>
    </outSequence>

Answer 1

The property ComsResponse is probably empty.

<property expression="json-eval($.ComsResponse)" name="Response" scope="default" type="STRING"/> 

The json-eval statement is looking for a ComsResponse element/key within the message. This does not exist as the result of just $. is only a string.

So currently the filter is testing the regex against an empty string. Try setting the Response property as follows:

<property expression="json-eval($.)" name="Response" scope="default" type="STRING"/>

For more details on the json-eval function check the WSO2 documentation.