Version: 9.4.32.v20200930 |

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 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.

> ### Note

> By default, logs are not set to be appended, meaning a the log file is wiped clean upon sever restart. You can change this setting by editing the `console-capture.ini` and un-commenting the line that reads `jetty.console-capture.append=true`.

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`.

`<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:

      2016-10-21 15:31:01.248:INFO::main: Logging initialized @332ms to org.eclipse.jetty.util.log.StdErrLog
      2016-10-21 15:31:01.370:INFO:oejs.Server:main: jetty-9.4.0-SNAPSHOT
      2016-10-21 15:31:01.400:INFO:oejs.AbstractConnector:main: Started ServerConnector@2c330fbc{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
      2016-10-21 15:31:01.400:INFO:oejs.Server:main: Started @485ms

  - Example when set to true:

      2016-10-21 15:31:35.020:INFO::main: Logging initialized @340ms to org.eclipse.jetty.util.log.StdErrLog
      2016-10-21 15:31:35.144:INFO:org.eclipse.jetty.server.Server:main: jetty-9.4.0-SNAPSHOT
      2016-10-21 15:31:35.174:INFO:org.eclipse.jetty.server.AbstractConnector:main: Started ServerConnector@edf4efb{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
      2016-10-21 15:31:35.175:INFO:org.eclipse.jetty.server.Server:main: Started @495ms

### 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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