Logger and message

Create a mule flow, add an http end point with the default host and port name.

Host: localhost

Port: 8081

Note: For practicing always use an http end point as it is easy to create and test.

Then add a logger component with the message value as #[payload], followed by one more logger component with message value as #[message].

The flow will look like this:

And the xml configuration looks as below:

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:http="http://www.mulesoft.org/schema/mule/http" 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" version="EE-3.5.0"
   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">
    <flow name="dismantlemuleFlow1" doc:name="dismantlemuleFlow1">
      <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" doc:name="HTTP"/>
      <logger message="#[payload]" level="INFO" doc:name="Logger"/>
      <logger message="#[message]" level="INFO" doc:name="Logger"/>   
    </flow>
</mule>

Run the application and hit the url with http://localhost:8081/testdata and you will get the following output in the console.

I

NFO  2015-01-28 08:30:10,677 [[dismantlemule].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: /testdata

INFO  2015-01-28 08:30:10,692 [[dismantlemule].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor:

org.mule.DefaultMuleMessage

{

  id=c5cde650-a699-11e4-8792-a0d3c169f60f

  payload=java.lang.String

  correlationId=<not set>

  correlationGroup=-1

  correlationSeq=-1

  encoding=UTF-8

  exceptionPayload=<not set>

Message properties:

  INVOCATION scoped properties:

  INBOUND scoped properties:

  Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

  Accept-Encoding=gzip, deflate

  Accept-Language=en-US,en;q=0.5

  Connection=true

  Host=localhost:8081

  Keep-Alive=true

  MULE_ORIGINATING_ENDPOINT=endpoint.http.localhost.8081

  MULE_REMOTE_CLIENT_ADDRESS=/127.0.0.1:50584

  User-Agent=Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0

  http.context.path=/

  http.context.uri=http://localhost:8081

  http.headers={Keep-Alive=true, Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8, Connection=true, User-Agent=Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0, Host=localhost:8081, Accept-Encoding=gzip, deflate, Accept-Language=en-US,en;q=0.5}

  http.method=GET

  http.query.params={}

  http.query.string=

  http.relative.path=testdata

  http.request=/testdata

  http.request.path=/testdata

  http.version=HTTP/1.1

  OUTBOUND scoped properties:

  MULE_ENCODING=UTF-8

  SESSION scoped properties:

}

The first line Is the output of the #[payload] mule expression, which as the name suggest prints the payload.

INFO  2015-01-28 08:30:10,677 [[dismantlemule].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: /testdata

And rest are the output of #[message] which gives the complete information of the message.

Note: Logging output of the payload will be very useful in debugging, like system.out.println in java. As it gives the clear information of how the payload looks at different stage of the flow.