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Logger Component (<logger/>)

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Configure messages for logs anywhere in a Mule flow. Mule applications print the messages when the Logger executes.

Component XML

This component supports the following XML structure:

<logger
  level="ERROR"
  doc:name="Logger"
  doc:id="45653f08"
  message="my logger message"
  category="My OPTIONAL CUSTOM CATEGORY"/>

Logger (<logger/>) attributes are configurable through the UI and XML.

Attribute Name Attribute XML Description

Logger (default)

doc:name

Editable name for the component to display in the canvas.

N/A

doc:id

Automatically generated identifier for the component.

Message

message

A string in double or single quotation marks, a DataWeave expression, a Mule variable, or a concatenated combination of supported values that serve as the message. When this field is empty, the Logger produces the following message:

{
  payload=<not set>
  mediaType=*/*
  attributes=<not set>
  attributesMediaType=*/*
}

Level

level

Options are DEBUG, ERROR, INFO (default), TRACE, WARN. In the console, the logger message begins with the level.

Category

category

Optional string that describes the logger in a way that helps you distinguish it from other loggers in your flow. In the console, the logger replaces the generic processor name with your category.

Examples

The following example sets a string as the message:

<logger
  level="INFO"
  doc:name="Logger"
  doc:id="45653f08"
  message="hello world"/>

When the application with this configuration runs, an entry like this one prints to the console:

INFO 2023-06-09 23:18:03,390 [[MuleRuntime].uber.24:
[my-app-1.0.0-SNAPSHOT-mule-application].my-appFlow.BLOCKING @55f71e0b]
[processor: my-appFlow/processors/3;
event: 8e0db930-0756-11ee-8aae-147ddaaf4f97]
org.mule.runtime.core.internal.processor.LoggerMessageProcessor:
hello world

The following example sets a category and uses DataWeave to concatenate a field in the message payload to the a string. Notice the #[] indicates that the message contains an expression or variable.

<logger
  level="INFO"
  doc:name="Logger"
  doc:id="45653f08"
  message="#[payload.id ++ " is the ID of this payload."]"
  category="PAYLOAD ID"/>

If you assume that the payload is {"id" : 12345, "message" : "hello!"}, an entry like this one prints to the console:

INFO 2023-06-09 23:18:03,390 [[MuleRuntime].uber.24:
[my-app-1.0.0-SNAPSHOT-mule-application].my-appFlow.BLOCKING @55f71e0b]
[processor: my-appFlow/processors/3;
event: 8e0db930-0756-11ee-8aae-147ddaaf4f97]
MY PAYLOAD:
12345 is the ID of this payload.

See Also