Mule flow with Groovy transformer (which creates a local class and instantiates / maps an object of that class)

gistfile1.txt

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting" 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/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/>
    <flow name="jsongroovyFlow">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/jsongroovy" doc:name="HTTP"/>
        <scripting:transformer returnClass="java.lang.String" doc:name="Groovy">
            <scripting:script engine="Groovy"><![CDATA[class RequestAttributes {
	String method
	String uri
}

def obj = new RequestAttributes(method: message.getInboundProperty("http.method"), uri: message.getInboundProperty("http.request.uri"))

return "${obj.method} (${obj.uri})".toString()]]></scripting:script>
        </scripting:transformer>
    </flow>
</mule>