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4.3. Logging system

Apache ServiceMix Kernel Karaf provides a powerful logging system based on OPS4j Pax Logging.

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• Apache Commons Logging
• SLF4J
• Apache Log4j
• Java Util Logging

The Kernel Karaf also comes with a set of console commands that can be used to display, view and change the log levels.

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The configuration of the logging system uses a standard Log4j configuration file at the following location:

[SMX4KNL:kernelkaraf]/etc/org.ops4j.pax.logging.cfg

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The log subshell comes with 3 commands:

• ld or log/:display: display the last log entries
• lde or log/:display-exception: display the last exception from the log
• log/:get: show the log levels
• log/:set: set the log levels

For example, if you want to debug something, you might want to run the following commands:

> log/:set DEBUG
... do something ...
> ldlog:display

Note that the log levels set using the log:set commands are not persistent and will be lost upon restart.
To configure those in a persistent way, you should edit the configuration file mentioned above.
4.3. Logging system #top

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