If you do nothing to configure a separate logging framework, Jetty will default to using an internal org.eclipse.jetty.util.log.StdErrLog implementation. This will output all logging events to STDERR (aka System.err).

Simply use Jetty and StdErrLog-based logging is output to the console.

Included in the Jetty distribution is a logging module named console-capture that is capable of performing simple capturing of all STDOUT (System.out) and STDERR (System.err) output to a file that is rotated daily.

To enable this feature, simply activate the console-capture module on the command line:

[my-base]$ java -jar ../start.jar --add-to-start=console-capture
INFO  : console-capture initialized in ${jetty.base}/start.d/console-capture.ini
MKDIR : ${jetty.base}/logs
INFO  : Base directory was modified

[my-base]$ tree
.
├── logs
└── start.d
    └── console-capture.ini

The default configuration for logging output will create a file ${jetty.base}/logs/yyyy_mm_dd.stderrout.log which allows configuration of the output directory by setting the jetty.logs property.

Just enabling the console-capture will simply output the values of STDERR and STDOUT to a log file. To customize the log further, a module named logging-jetty is available to provides a default properties file to configure. As with console-capture, you activate the logging-jetty on the command line.

[my-base]$ java -jar ../start.jar --add-to-start=logging-jetty
INFO  : logging-jetty   initialized in ${jetty.base}/start.d/logging-jetty.ini
INFO  : resources       transitively enabled
MKDIR : ${jetty.base}/resources
COPY  : ${jetty.home}/modules/logging-jetty/resources/jetty-logging.properties to ${jetty.base}/resources/jetty-logging.properties
INFO  : Base directory was modified

[my-base]$ tree
.
├── logs
├── resources
│   └── jetty-logging.properties
└── start.d
    ├── console-capture.ini
    └── logging-jetty.ini

Once activated, you can find the properties file at ${jetty.base}/resources/jetty-logging.properties. By default, the following parameters are defined. To change them, un-comment the line and substitute your naming scheme and configuration choices.

## Force jetty logging implementation
#org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.StdErrLog

## Set logging levels from: ALL, DEBUG, INFO, WARN, OFF
#org.eclipse.jetty.LEVEL=INFO
#com.example.LEVEL=INFO

## Hide stacks traces in logs?
#com.example.STACKS=false

## Show the source file of a log location?
#com.example.SOURCE=false

There are a number of properties that can be defined in the configuration that will affect the behavior of StdErr logging with console-capture.

These parameters existed in prior versions of Jetty, and are no longer supported. They are included here for historical (and search engine) reasons.