[JAVA] How to output Jetty log to any directory

Overview

The lightweight web server Jetty outputs the following two log files.

• Standard output / standard error output
• access log

By default, these log files are output to logs directly under the directory specified by the jetty.base property.

Jetty Reference Default Logging with Jetty's StdErrLog and Configuring Jetty Request Logs I referred to .eclipse.org/jetty/documentation/current/configuring-jetty-request-logs.html), but it was difficult to understand how to change the output destination to an arbitrary directory, so I summarized it in this article.

Contents

1. How to change the output destination of standard output / standard error output log

Log file settings are made from ʻetc / jetty-logging.xml`.

jetty-logging.xml

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">


<!-- =============================================================== -->
<!-- Configure stderr and stdout to a Jetty rollover log file        -->
<!-- this configuration file should be used in combination with      -->
<!-- other configuration files.  e.g.                                -->
<!--    java -jar start.jar etc/jetty-logging.xml                    -->
<!-- =============================================================== -->
<Configure id="logging" class="org.eclipse.jetty.util.log.Log">

    <New id="ServerLog" class="java.io.PrintStream">
      <Arg>
        <New class="org.eclipse.jetty.util.RolloverFileOutputStream">
          <Arg><Property name="jetty.logs" default="./logs"/>/yyyy_mm_dd.stderrout.log</Arg>
          <Arg type="boolean">false</Arg>
          <Arg type="int">90</Arg>
          <Arg><Call class="java.util.TimeZone" name="getTimeZone"><Arg>GMT</Arg></Call></Arg>
          <Get id="ServerLogName" name="datedFilename"/>
        </New>
      </Arg>
    </New>

    <Get name="rootLogger">
      <Call name="info"><Arg>Redirecting stderr/stdout to <Ref refid="ServerLogName"/></Arg></Call>
    </Get>
    <Call class="java.lang.System" name="setErr"><Arg><Ref refid="ServerLog"/></Arg></Call>
    <Call class="java.lang.System" name="setOut"><Arg><Ref refid="ServerLog"/></Arg></Call>

</Configure>

changes

<Arg><Property name="jetty.logs" default="./logs"/>/yyyy_mm_dd.stderrout.log</Arg>

It is now output as yyyy_mm_dd.stderrout.log directly under the directory specified by the jetty.logs property ($ pwd / logs if there is no property).

As a workaround, specify the value LOG_DIR = / test / logs in the system property of the Jetty start command and refer to LOG_DIR in jetty-logging.xml so that the log can be output to any directory. Will be.

$ java -DLOG_DIR=/test/logs -jar start.jar

<Arg><Property name="LOG_DIR"/>/yyyy_mm_dd.stderrout.log</Arg>

In this example, the standard output / standard error output log is output to /test/logs/yyyy_mm_dd.stderrout.log.

2. How to change the output destination of the access log

Log file settings are made from ʻetc / jetty-requestlog.xml`.

jetty-requestlog.xml

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">

<!-- =============================================================== -->
<!-- Configure the Jetty Request Log                                 -->
<!-- =============================================================== -->
<Configure id="Server" class="org.eclipse.jetty.server.Server">

  <!-- =========================================================== -->
  <!-- Configure Request Log -->
  <!-- =========================================================== -->
  <Ref refid="Handlers">
    <Call name="addHandler">
      <Arg>
        <New id="RequestLog" class="org.eclipse.jetty.server.handler.RequestLogHandler">
          <Set name="requestLog">
            <New id="RequestLogImpl" class="org.eclipse.jetty.server.AsyncNCSARequestLog">
              <Set name="filename"><Property name="jetty.base" default="." /><Property name="requestlog.filename" default="/logs/yyyy_mm_dd.request.log"/></Set>
              <Set name="filenameDateFormat"><Property name="requestlog.filenameDateFormat" default="yyyy_MM_dd"/></Set>
              <Set name="retainDays"><Property name="requestlog.retain" default="90"/></Set>
              <Set name="append"><Property name="requestlog.append" default="false"/></Set>
              <Set name="extended"><Property name="requestlog.extended" default="false"/></Set>
              <Set name="logCookies"><Property name="requestlog.cookies" default="false"/></Set>
              <Set name="LogTimeZone"><Property name="requestlog.timezone" default="GMT"/></Set>
            </New>
          </Set>
        </New>
      </Arg>
    </Call>
  </Ref>

</Configure>

changes

<Set name="filename"><Property name="jetty.base" default="." /><Property name="requestlog.filename" default="/logs/yyyy_mm_dd.request.log"/></Set>

It is now output as /logs/yyyy_mm_dd.request.log directly under the directory specified by the jetty.base property ($ pwd if there is no property).

Unlike the standard output / standard error output log, the output destination directory and output file name are specified separately for the access log. Note that the output file name includes the logs directory specification by default.

As a workaround, specify the value LOG_DIR = / test / logs in the system property of the Jetty start command and refer to LOG_DIR in jetty-requestlog.xml as in the standard output / standard error output log. This will allow you to output the log to any directory.

$ java -DLOG_DIR=/test/logs -jar start.jar

<Set name="filename"><Property name="LOG_DIR"/><Property name="requestlog.filename" default="/yyyy_mm_dd.request.log"/></Set>

The logs directory is removed from the output file name of the requestlog.filename property so that only the file name is used.

In this example, the access log is output to /test/logs/yyyy_mm_dd.request.log.