MULE表达式变换器不被接受

问题描述：

我正在尝试学习Mule ESB，但是遇到了示例项目的问题。为什么这些行
下划线为红色，不在Message流中表示？

I'm trying to learn Mule ESB but get problems with example projects. Why are these lines underlined red and not represented in the Message flow?

<expression-transformer name="returnAttachments">
        <return-argument evaluator="attachments-list" expression="*.txt,*.ozb,*.xml" optional="false"/>
    </expression-transformer>

作为示例项目的一部分，我从mulesoft.org剪切并粘贴了这些行。 p>

I've cut and pasted these lines from mulesoft.org as part of a sample project.

答

@genjosanzo是对的，MEL相当于：

@genjosanzo is right, the MEL equivalent would be:

<expression-transformer
        expression="#[($.value in message.inboundAttachments.entrySet() if $.key ~= '(.*\\.txt|.*\\.ozb|.*\\.xml)')]" />

MULE表达式变换器不被接受

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