Log Component

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

Camel 2.7 or better uses sfl4j which allows you to configure logging via, among others:

Camel 2.6 or lower uses commons-logging which allows you to configure logging via, among others:

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.

Also a log in the DSL
In Camel 2.2 onwards there is a log directly in the DSL, but it has a different purpose. Its meant for lightweight and human logs. See more details at LogEIP.

Options

Option Default Type Description
level INFO String Logging level to use. Possible values: FATAL, ERROR, WARN, INFO, DEBUG, TRACE, OFF
    Throughput logging options. By default regular logging is used.
marker null String Camel 2.9: An optional Marker name to use.
groupSize null Integer An integer that specifies a group size for throughput logging.
groupInterval null Integer Camel 2.6: If specified will group message stats by this time interval (in millis)
groupDelay 0 Integer Camel 2.6: Set the initial delay for stats (in millis)
groupActiveOnly true boolean Camel 2.6: If true, will hide stats when no new messages have been received for a time interval, if false, show stats regardless of message traffic

note: groupDelay and groupActiveOnly are only applicable when using groupInterval

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. (multiline, maxChars has to be manually set if to be used)
showExchangeId false Show the unique exchange ID.
showExchangePattern true Camel 2.3: Shows the Message Exchange Pattern (or MEP for short).
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 (using the key Exchange.EXCEPTION_CAUGHT) 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. Only effective if one of showAll, showException or showCaughtException are enabled.
showFiles false Camel 2.9: Whether Camel should show file bodies or not (eg such as java.io.File).
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.
showStreams false Camel 2.8: Whether Camel should show stream bodies or not (eg such as java.io.InputStream). Beware if you enable this option then you may not be able later to access the message body as the stream have already been read by this logger. To remedy this you have to use Stream caching.
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. The default value is 10000 from Camel 2.9 onwards.
Logging stream bodies
Camel will by default not log stream or files bodies. You can force Camel to log those by setting the property on the CamelContext properties
camelContext.getProperties().put(Exchange.LOG_DEBUG_BODY_STREAMS, true);

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 with groupSize 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");

Throughput logger with groupInterval sample

This route will result in message stats logged every 10s, with an initial 60s delay and stats should be displayed even if there isn't any message traffic.

from("activemq:orders").
to("log:com.mycompany.order?level=DEBUG&groupInterval=10000&groupDelay=60000&groupActiveOnly=false").to("bean:processOrder");

The following will be logged:

"Received: 1000 new messages, with total 2000 so far. Last group took: 10000 millis which is: 100 messages per second. average: 100"

See Also

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