Re: [jetty-users] LOG.info(), LOG.warn() not visible in log files

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Re: [jetty-users] LOG.info(), LOG.warn() not visible in log files

From: Joakim Erdfelt <joakim@xxxxxxxxxxx>
Date: Wed, 30 Aug 2017 12:05:07 -0700
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There seems to be some confusion here.

Jetty Logging

Jetty Logging refers to the server side logging, not webapp.

While it's possible to use from a webapp, its actually easier to use a formal logging library (like slf4j, logback, log4j, java.util.logging, etc)

logs/yyyy_mm_dd.request.log

The files ...

/var/log/jetty/ws-slova.de/2017_08_30.request.log

/var/log/jetty/slova.de/2017_08_30.request.log

... are request logs, aka NCSA access logging.

These are not related to server logging, and do not use the Server logging framework.

jetty-logging.properties location

The file jetty-logging.properties can exist as a resource that the classloader can access.

>From the server classloader point of view, that file is accessed from

${jetty.base}/resources/jetty-logging.properties

From a webapp classloader point of view, that file is accessed from your

${jetty.base}/webapps/<appname>.war!/WEB-INF/classes/jetty-logging.properties

It is strongly discouraged to change the logging behavior of the Jetty Logging infrastructure from within a webapp, as it can make changes to the server side as well.

We would encourage you to setup a some formal logging library in your webapp (having more then 1 logging library in your webapp is extremely common btw)

jetty-logging.properties configuration

The first line in the jetty-logging.properties dictates the logging technique to use.

org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.StdErrLog

The StdErrLog is the default behavior, and will produce logging events to STDERR (aka System Error. like System.err.println("hello"))

This produces no log files, it only shows up on the console on the STDERR streams.

Console Capture

If you configure for logging on Jetty 9.4.x you'll see a module called "console-capture".

That simply takes whatever is being written to the console, on either STDOUT (System out) or STDERR (System error) and redirects it to a file with rolling.

Jetty Server Logging Configuration

You can configure Jetty server logging to use something other then StdErrLog + Console Capture.

Two very common techniques:

java.util.logging - configure org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.JavaUtilLog
slf4j + logback - configure org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.Slf4jLog

Joakim Erdfelt / joakim@xxxxxxxxxxx

On Wed, Aug 30, 2017 at 2:12 AM, Alexander Farber <alexander.farber@xxxxxxxxx> wrote:

Good morning,

on CentOS 7 Linux I have installed Jetty as:

# java -jar /usr/share/java/jetty-distribution-9.4.6.v20170531/start.jar jetty.home=/usr/share/java/jetty-distribution-9.4.6.v20170531 jetty.base=/var/www/jetty-base --create-startd --add-to-start=http,servlet,webapp,deploy,resources,fcgi,websocket,proxy-protocol

and then start it as:

java -Djdbc.drivers=org.postgresql.Driver -jar /usr/share/java/jetty-distribution-9.4.6.v20170531/start.jar jetty.home=/usr/share/java/jetty-distribution-9.4.6.v20170531 jetty.base=/var/www/jetty-base jetty.http.host=127.0.0.1

In $JETTY_BASE/webapps I have 2 files to run my app (a custom WebSocketServlet) and to proxy Wordpress -

1) ws-slova.de.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN"
    "http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure class="org.eclipse.jetty.webapp.WebAppContext">

    <Set name="contextPath">/ws</Set>

    <Set name="virtualHosts">
            <Array type="java.lang.String">
                    <Item>slova.de</Item>
                    <Item>www.slova.de</Item>
            </Array>
    </Set>

    <Set name="war"><SystemProperty name="jetty.base"/>/webapps/ws-servlet-0.1-SNAPSHOT.war</Set>

    <Call name="insertHandler">
        <Arg>
            <New id="RequestLog" class="org.eclipse.jetty.server.handler.RequestLogHandler">
                <Set name="requestLog">
                    <New id="RequestLogImpl" class="org.eclipse.jetty.server.NCSARequestLog">
                        <Set name="filename">/var/log/jetty/ws-slova.de/yyyy_mm_dd.request.log</Set>
                        <Set name="filenameDateFormat">yyyy_MM_dd</Set>
                        <Set name="LogTimeZone">GMT</Set>
                        <Set name="retainDays">30</Set>
                        <Set name="append">true</Set>
                    </New>
                </Set>
            </New>
        </Arg>
    </Call>

</Configure>

2) slova.de.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN"
    "http://www.eclipse.org/jetty/configure_9_3.dtd">
<Configure class="org.eclipse.jetty.servlet.ServletContextHandler">

    <New id="root" class="java.lang.String">
        <Arg>/var/www/html/slova.de</Arg>
    </New>

    <Set name="contextPath">/</Set>

    <Set name="virtualHosts">
            <Array type="java.lang.String">
                    <Item>slova.de</Item>
                    <Item>www.slova.de</Item>
            </Array>
    </Set>

    <Set name="resourceBase"><Ref refid="root" /></Set>

    <Set name="welcomeFiles">
        <Array type="string">
                <Item>index.html</Item>
                <Item>index.php</Item>
        </Array>
    </Set>

    <Call name="addFilter">
        <Arg>org.eclipse.jetty.fcgi.server.proxy.TryFilesFilter</Arg>
        <Arg>/*</Arg>
        <Arg>
            <Call name="of" class="java.util.EnumSet">
                <Arg><Get name="REQUEST" class="javax.servlet.DispatcherType" /></Arg>
            </Call>
        </Arg>
        <Call name="setInitParameter">
            <Arg>files</Arg>
            <Arg>$path /index.php?p=$path</Arg>
        </Call>
    </Call>

    <Call name="addServlet">
        <Arg>
            <New class="org.eclipse.jetty.servlet.ServletHolder">
                <Arg>default</Arg>
                <Arg>
                    <Call name="forName" class="java.lang.Class">
                        <Arg>org.eclipse.jetty.servlet.DefaultServlet</Arg>
                    </Call>
                </Arg>
                <Call name="setInitParameter">
                    <Arg>dirAllowed</Arg>
                    <Arg>false</Arg>
                </Call>
                <Call name="setInitParameter">
                    <Arg>gzip</Arg>
                    <Arg>true</Arg>
                </Call>
            </New>
        </Arg>
        <Arg>/</Arg>
    </Call>

    <Call name="addServlet">
        <Arg>org.eclipse.jetty.fcgi.server.proxy.FastCGIProxyServlet</Arg>
        <Arg>*.php</Arg>
        <Call name="setInitParameter">
            <Arg>proxyTo</Arg>
            <Arg>http://localhost:9000</Arg>
        </Call>
        <Call name="setInitParameter">
            <Arg>prefix</Arg>
            <Arg>/</Arg>
        </Call>
        <Call name="setInitParameter">
            <Arg>scriptRoot</Arg>
            <Arg><Ref refid="root" /></Arg>
        </Call>
        <Call name="setInitParameter">
            <Arg>scriptPattern</Arg>
            <Arg>(.+?\\.php)</Arg>
        </Call>
    </Call>

    <Call name="insertHandler">
        <Arg>
            <New id="RequestLog" class="org.eclipse.jetty.server.handler.RequestLogHandler">
                <Set name="requestLog">
                    <New id="RequestLogImpl" class="org.eclipse.jetty.server.NCSARequestLog">
                        <Set name="filename">/var/log/jetty/slova.de/yyyy_mm_dd.request.log</Set>
                        <Set name="filenameDateFormat">yyyy_MM_dd</Set>
                        <Set name="LogTimeZone">GMT</Set>
                        <Set name="retainDays">30</Set>
                        <Set name="append">true</Set>
                    </New>
                </Set>
            </New>
        </Arg>
    </Call>

</Configure>

This works well, but I have one problem - in the log files

    /var/log/jetty/ws-slova.de/2017_08_30.request.log

    /var/log/jetty/slova.de/2017_08_30.request.log

I do not see any output by java directives LOG.info and LOG.warn, which I call in my servlet as -

import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

public static final Logger LOG = Log.getLogger("slova");

public class MyListener implements WebSocketListener {

    @Override
    public void onWebSocketConnect(Session session) {
        LOG.info("onWebSocketConnect: {}", session);            // UNFORTUNATELY I DO NOT SEE THIS
        mSession = session;
    }

I have read https://www.eclipse.org/jetty/documentation/9.4.x/configuring-logging.html but I am still confused, what should I do? The doc talks about jetty-logging.properties file, should I create one?

Currently there is only one such file in $JETTY_HOME:

# cat /usr/share/java/jetty-distribution-9.4.6.v20170531/modules/logging-jetty/resources/jetty-logging.properties

## 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

Am I really supposed to edit that file? I was thinking $JETTY_HOME files are not to be touched.

Regards
Alex

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References:
- [jetty-users] LOG.info(), LOG.warn() not visible in log files
  - From: Alexander Farber

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