如何在骡子记录器中连接？

Question

I need to concatenate text with json payload in logger component. I have tried below ways but no luck

<logger level="INFO" doc:name="Logger" doc:id="38de876a-a64f-4d83-86a1-ef4cbbda167c" message="#['payload is:' + payload]"/>

Even i don't see any transformers like 'object to string converter' in mule 3.

Please suggest syntax for mule 4

Answer 1

Try separating the text from your dataweave

ie

<logger level="INFO" doc:name="Logger" mesage="Payload is: #[payload]" doc:id="38de876a-a64f-4d83-86a1-ef4cbbda167c" />

All the various transformers were removed in Mule 4 due to the payload always being "accessible". That is, regardless of the payload type (XML, JSON, Java, CSV...) you can access fields through payload.{fieldname}. In Mule 3.x the payload had to be coerced to a Java object to allow that. You can explicitly set the output type of any dataweave expression, so you can also try:

mesage="Payload is: #[output application/java --- payload]" 

Answer 2

它正在使用以下语法

<logger level="INFO" doc:name="Logger" doc:id="38de876a-a64f-4d83-86a1-ef4cbbda167c" message="#['payload is:' ++ payload]"/>

Answer 3

我遇到了同样的问题，以下对我有用...

    <logger level="INFO" doc:name="Logger" doc:id="35d4566e-02ba-495a-bd40-c30aa5a90413" message="#['Get Accounts Response Paylaod : #[payload]']"/>