Try Pizug Companion

Companion is a docker image you can install to your Windows/Mac/Linux that will give you tools like "Flow Diff", "Credentials Where-used", "Flow Image".

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Groovy Examples

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MPL Payload Log

Basic MPL logging to see the payload in the monitoring.

You don't have to import any library to use messageLogFactory. It is already "injected" to your script.

Script

Try it on

import com.sap.gateway.ip.core.customdev.util.Message;

def Message processData(Message message) {
    def body = message.getBody(java.lang.String) as String;

    def messageLog = messageLogFactory.getMessageLog(message);
    if(messageLog != null){

        messageLog.setStringProperty("Logging", "Printing Payload As Attachment");
        messageLog.addAttachmentAsString("Message#1", body, "text/plain");

    }
    return message;
}