Apache Camel: Log

Log Component

The log: component logs message exchanges to the underlying logging mechanism.

Camel uses commons-logging which allows you to configure logging via

Log4j
JDK 1.4 logging
Avalon
SimpleLog - a simple provider in commons-logging

Refer to the commons-logging user guide for a more complete overview of how to use and configure commons-logging.

URI format

log:loggingCategory[?options]

Where loggingCategory is the name of the logging category to use. You can append query options to the URI in the following format, ?option=value&option=value&...

For example, a log endpoint typically specifies the logging level using the level option, as follows:

log:org.apache.camel.example?level=DEBUG

The default logger logs every exchange (regular logging). But Camel also ships with the Throughput logger, which is used whenever the groupSize option is specified.

Options

Option	Default	Type	Description
`level`	`INFO`	`String`	Logging level to use. Possible values: `FATAL`, `ERROR`, `WARN`, `INFO`, `DEBUG`, `TRACE`, `OFF`
`groupSize`	`null`	`Integer`	An integer that specifies a group size for throughput logging. By default, regular logging is used.

Formatting

The log formats the execution of exchanges to log lines.
By default, the log uses LogFormatter to format the log output, where LogFormatter has the following options:

Option	Default	Description
`showAll`	`false`	Quick option for turning all options on.
`showExchangeId`	`false`	Show the unique exchange ID.
`showProperties`	`false`	Show the exchange properties.
`showHeaders`	`false`	Show the In message headers.
`showBodyType`	`true`	Show the In body Java type.
`showBody`	`true`	Show the In body.
`showOut`	`false`	If the exchange has an Out message, show the Out message.
`showException`	`false`	Camel 2.0: If the exchange has an exception, show the exception message (no stack trace).
`showCaughtException`	`false`	Camel 2.0: If the exchange has a caught exception, show the exception message (no stack trace). A caught exception is stored as a property on the exchange and for instance a `doCatch` can catch exceptions. See Try Catch Finally.
`showStackTrace`	`false`	Camel 2.0: Show the stack trace, if an exchange has an exception.
`showFuture`	`false`	Camel 2.1: Whether Camel should show `java.util.concurrent.Future` bodies or not. If enabled Camel could potentially wait until the `Future` task is done. Will by default not wait.
`multiline`	`false`	If `true`, each piece of information is logged on a new line.
`maxChars`		Camel 2.0: Limits the number of characters logged per line.

Regular logger sample

In the route below we log the incoming orders at DEBUG level before the order is processed:

from("activemq:orders").to("log:com.mycompany.order?level=DEBUG").to("bean:processOrder");

Or using Spring XML to define the route:

  <route>
    <from uri="activemq:orders"/>
    <to uri="log:com.mycompany.order?level=DEBUG"/>
    <to uri="bean:processOrder"/>
  </route>

Regular logger with formatter sample

In the route below we log the incoming orders at INFO level before the order is processed.

from("activemq:orders").
    to("log:com.mycompany.order?showAll=true&multiline=true").to("bean:processOrder");

Throughput logger sample

In the route below we log the throughput of the incoming orders at DEBUG level grouped by 10 messages.

from("activemq:orders").
    to("log:com.mycompany.order?level=DEBUG?groupSize=10").to("bean:processOrder");

Log Component

URI format

Options

Formatting

Regular logger sample

Regular logger with formatter sample

Throughput logger sample

See Also

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