Version: 9.3.16.v20170120 |

Default Logging with Jetty’s StdErrLog
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## Default Logging with Jetty’s StdErrLog

### StdErrLog Configuration

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.

Included in the Jetty distribution is a logging module that is capable of performing simple capturing of all STDOUT and STDERR output to a file that is rotated daily.

To enable on this feature via the command line:

    [my-base]$ java -jar /opt/jetty/start.jar --module=logging

You can also include the `--module=logging` command in your `${jetty.base}/start.ini`.

    [my-base]$ java -jar /opt/jetty/start.jar --add-to-start=logging

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

For more advanced logging configurations, please consider use of a separate logging library.

The recommended way to configure `StdErrLog` is to create a `${jetty.home}/resources/jetty-logging.properties` file, specify the log implementation to `StdErrLog` and then setup logging levels.

    # Configure Jetty for StdErrLog Logging
    org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.StrErrLog
    # Overall Logging Level is INFO
    org.eclipse.jetty.LEVEL=INFO
    # Detail Logging for WebSocket
    org.eclipse.jetty.websocket.LEVEL=DEBUG

There are a number of properties that can be defined in the configuration that will affect the behavior of `StdErrLog`.

`<name>.LEVEL=<level>`
  Sets the logging level for all loggers within the `name` specified to the level, which can be (in increasing order of restriction) `ALL`, `DEBUG`, `INFO`, `WARN`, `OFF`. The name (or hierarchy) can be a specific fully qualified class or a package namespace. For example, `org.eclipse.jetty.http.LEVEL=DEBUG` is a package namespace approach to turn all loggers in the Jetty HTTP package to DEBUG level, and `org.eclipse.jetty.io.ChanelEndPoint.LEVEL=ALL` turns on all logging events for the specific class, including `DEBUG`, `INFO`, `WARN` (and even special internally ignored exception classes). If more than one system property specifies a logging level, the most specific one applies.
`<name>.SOURCE=<boolean>`
  Named Logger specific, attempts to print the Java source file name and line number from where the logging event originated. Name must be a fully qualified class name (this configurable does not support package name hierarchy). Default is false. Be aware that this is a slow operation and has an impact on performance.
`<name>.STACKS=<boolean>`
  Named Logger specific, controls the display of stacktraces. Name must be a fully qualified class name (this configurable does not support package name hierarchy). Default is true.
`org.eclipse.jetty.util.log.stderr.SOURCE=<boolean>`
  Special Global Configuration. Attempts to print the Java source file name and line number from where the logging event originated. Default is false.
`org.eclipse.jetty.util.log.stderr.LONG=<boolean>`

  Special Global Configuration. When true, outputs logging events to `STDERR` using long form, fully qualified class names. When false, uses abbreviated package names. Default is false. +

  - Example when set to false: +

    2014-06-03 14:36:16.013:INFO:oejs.Server:main: jetty-9.2.0.v20140526
    2014-06-03 14:36:16.028:INFO:oejdp.ScanningAppProvider:main: Deployment monitor [file:/opt/jetty/demo-base/webapps/] at interval 1
    2014-06-03 14:36:16.051:INFO:oejsh.ContextHandler:main: Started o.e.j.s.h.MovedContextHandler@7d256e50{/oldContextPath,null,AVAILABLE}
    2014-06-03 14:36:17.880:INFO:oejs.ServerConnector:main: Started ServerConnector@34f2d11a{HTTP/1.1}{0.0.0.0:8080}
    2014-06-03 14:36:17.888:INFO:oejs.Server:main: Started @257ms

    +
    * Example when set to true:
    +

    2014-06-03 14:38:19.019:INFO:org.eclipse.jetty.server.Server:main: jetty-9.2.0.v20140526
    2014-06-03 14:38:19.032:INFO:org.eclipse.jetty.deploy.providers.ScanningAppProvider:main: Deployment monitor [file:/opt/jetty/demo-base/webapps/] at interval 1
    2014-06-03 14:38:19.054:INFO:org.eclipse.jetty.server.handler.ContextHandler:main: Started o.e.j.s.h.MovedContextHandler@246d8660{/oldContextPath,null,AVAILABLE}
    2014-06-03 14:38:20.715:INFO:org.eclipse.jetty.server.ServerConnector:main: Started ServerConnector@59f625be{HTTP/1.1}{0.0.0.0:8080}
    2014-06-03 14:38:20.723:INFO:org.eclipse.jetty.server.Server:main: Started @243ms

### Deprecated Parameters

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

`org.eclipse.jetty.util.log.DEBUG`

  Formerly used to enable DEBUG level logging on any logger used within Jetty (not just Jetty’s own logger).

  - Replaced with using the logger implementation specific configuration and level filtering.
`org.eclipse.jetty.util.log.stderr.DEBUG`

  Formerly used to enable DEBUG level logging on the internal Jetty `StdErrLog` implementation.

  - Replaced with level specific equivalent. Example: `org.eclipse.jetty.LEVEL=DEBUG`
`DEBUG`

  Ancient debugging flag that turned on all debugging, even non-logging debugging.

  - Jetty no longer uses because many third party libraries employ this overly simple property name, which would generate far too much console output.

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