Fuse ESB Enterprise - Configuring and Running Fuse ESB Enterprise

Logging Configuration

Overview

The logging system is configured by a combination of two OSGi Admin PIDs and one configuration file:

etc/system.properties—the configuration file that sets the logging level during the container’s boot process. The file contains a single property, org.ops4j.pax.logging.DefaultServiceLog.level, that is set to ERROR by default.

org.ops4j.pax.logging—the PID used to configure the logging back end service. It sets the logging levels for all of the defined loggers and defines the appenders used to generate log output. It uses standard Log4j configuration. By default, it sets the root logger's level to INFO and defines two appenders: one for the console and one for the log file.

Tip

	Tip
The console's appender is disabled by default. To enable it, add `log4j.appender.stdout.append=true` to the configuration For example, to enable the console appender in a standalone container, you would use the following commands: `FuseESB:karaf@root>` `config:edit org.ops4j.pax.logging` `FuseESB:karaf@root>` `config:propappend log4j.appender.stdout.append true` `FuseESB:karaf@root>` `config:update`

The console's appender is disabled by default. To enable it, add log4j.appender.stdout.append=true to the configuration For example, to enable the console appender in a standalone container, you would use the following commands:

FuseESB:karaf@root> config:edit org.ops4j.pax.logging
FuseESB:karaf@root> config:propappend log4j.appender.stdout.append true
FuseESB:karaf@root> config:update

org.apache.karaf.log.cfg—configures the output of the log console commands.

The most common configuration changes you will make are changing the logging levels, changing the threshold for which an appender writes out log messages, and activating per bundle logging.

Changing the log levels

The default logging configuration sets the logging levels so that the log file will provide enough information to monitor the behavior of the runtime and provide clues about what caused a problem. However, the default configuration will not provide enough information to debug most problems.

The most useful logger to change when trying to debug an issue with Fuse ESB Enterprise is the root logger. You will want to set its logging level to generate more fine grained messages. To do so you change the value of the org.ops4j.pax.logging PID's log4j.rootLogger property so that the logging level is one of the following:

TRACE
DEBUG
INFO
WARN
ERROR
FATAL
NONE

Example 22 shows the commands for setting the root loggers log level in a standalone container.

Example 22. Changing Logging Levels

FuseESB:karaf@root> config:edit org.ops4j.pax.logging
FuseESB:karaf@root> config:propset log4j.rootLogger "DEBUG, out, osgi:VmLogAppender"
FuseESB:karaf@root> config:update

Changing the appenders' thresholds

When debugging a problem in Fuse ESB Enterprise you may want to limit the amount of logging information that is displayed on the console, but not the amount written to the log file. This is controlled by setting the thresholds for each of the appenders to a different level. Each appender can have a log4j.appender.appenderName.threshold property that controls what level of messages are written to the appender. The appender threshold values are the same as the log level values.

Example 23 shows an example of setting the root logger to DEBUG but limiting the information displayed on the console to WARN.

Example 23. Changing the Log Information Displayed on the Console

FuseESB:karaf@root> config:edit org.ops4j.pax.logging
FuseESB:karaf@root> config:propset log4j.rootLogger "DEBUG, out, osgi:VmLogAppender"
FuseESB:karaf@root> config:propappend log4j.appender.stdout.threshold WARN
FuseESB:karaf@root> config:update

Logging per bundle

It is possible to reconfigure Fuse ESB Enterprise logging so that it writes one log file for each bundle, instead of writing all of the log messages into a single log file. This feature is enabled by adding the Log4j sift appender to the Log4j root logger as shown in Example 24.

Example 24. Enabling Per Bundle Logging

FuseESB:karaf@root> config:edit org.ops4j.pax.logging
FuseESB:karaf@root> config:propset log4j.rootLogger "INFO, out, sift, osgi:VmLogAppender"
FuseESB:karaf@root> config:update

After restarting the container, you can see that each BundleName bundle now has its own log file, located at data/log/BundleName.log.

This is the behavior you will see with the default sift appender settings. You can edit this behavior using the sift appender configuration settings in org.ops4j.pax.logging.cfg.

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