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And in Camel 2.2 you can use the log DSL which allows you to use Simple language to construct a dynamic message which gets logged.
For example you can do

from("direct:start").log("Processing ${id}").to("bean:foo");

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The log DSL have overloaded methods to set the logging level and/or name as well.

from("direct:start").log(LoggingLevel.DEBUG, "Processing ${id}").to("bean:foo");

and to set a logger name

from("direct:start").log(LoggingLevel.DEBUG, "com.mycompany.MyCoolRoute", "Processing ${id}").to("bean:foo");

Since Camel 2.12.4/2.13.1 the logger instance may be used as well:

from("direct:start").log(LoggingLeven.DEBUG, org.slf4j.LoggerFactory.getLogger("com.mycompany.mylogger"), "Processing ${id}").to("bean:foo");

For example you can use this to log the file name being processed if you consume files.

from("file://target/files").log(LoggingLevel.DEBUG, "Processing file ${file:name}").to("bean:foo");

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In Spring DSL its also easy to use log DSL as shown below:

        <route id="foo">
            <from uri="direct:foo"/>
            <log message="Got ${body}"/>
            <to uri="mock:foo"/>
        </route>

The log tag has attributes to set the message, loggingLevel and logName. For example:

        <route id="baz">
            <from uri="direct:baz"/>
            <log message="Me Got ${body}" loggingLevel="FATAL" logName="com.mycompany.MyCoolRoute"/>
            <to uri="mock:baz"/>
        </route>

Since Camel 2.12.4/2.13.1 it is possible to reference logger instance. For example:

        <bean id="myLogger" class="org.slf4j.LoggerFactory" factory-method="getLogger" xmlns="http://www.springframework.org/schema/beans">
            <constructor-arg value="com.mycompany.mylogger" />
        </bean>

        <route id="moo" xmlns="http://camel.apache.org/schema/spring">
            <from uri="direct:moo"/>
            <log message="Me Got ${body}" loggingLevel="INFO loggerRef="myLogger"/>
            <to uri="mock:baz"/>
        </route>

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You can specify a marker name in the DSL

        <route id="baz">
            <from uri="direct:baz"/>
            <log message="Me Got ${body}" loggingLevel="FATAL" logName="com.mycompany.MyCoolRoute" marker="myMarker"/>
            <to uri="mock:baz"/>
        </route>

Using log DSL in OSGi

Improvement as of Camel 2.12.4/2.13.1

When using log DSL inside OSGi (e.g., in Karaf), the underlying logging mechanisms are provided by PAX logging. It searches for a bundle which invokes org.slf4j.LoggerFactory.getLogger() method and associates the bundle with the logger instance. Passing only logger name to log DSL results in associating camel-core bundle with the logger instance created.

In some scenarios it is required that the bundle associated with logger should be the bundle which contains route definition. This is possible using provided logger instance both for Java DSL and Spring DSL (see the examples above).