How to log in different file? log4j2

Question

I need to log all info to info.log, all warn to warn.log etc and all my logs to all.log. I've been create a log4j2.xml configuration.

<?xml version="1.0" encoding="UTF-8"?>
    <configuration monitorInterval = "3" status = "info">
        <appenders>
            <File name="ALL_LOG" fileName="logs/all.log">
                <PatternLayout pattern="%d{ISO8601} [%-5p] (%F:%L) - %m%n"/>
            </File>
            <File name="FILE_ERROR" fileName="logs/error.log">
                <PatternLayout pattern="%d{ISO8601} [%-5p] (%F:%L) - %m%n"/>
            </File>
            <File name="FILE_INFO" fileName="logs/info.log">
                <PatternLayout pattern="%d{ISO8601} [%-5p] (%F:%L) - %m%n"/>
            </File>
            <File name="FILE_DEBUG" fileName="logs/debug.log">
                <PatternLayout pattern="%d{ISO8601} [%-5p] (%F:%L) - %m%n"/>
            </File>
            <File name="FILE_WARN" fileName="logs/warn.log">
                <PatternLayout pattern="%d{ISO8601} [%-5p] (%F:%L) - %m%n"/>
            </File>
            <Console name="STDOUT" target="SYSTEM_OUT.log">
                <PatternLayout pattern="%d{ABSOLUTE} [%-5p] (%F:%L) - %m%n"/>
            </Console>
        </appenders>
        <loggers>
            <root>
                <appender-ref ref="ALL_LOG"/>
            </root>
            <root level="error">
                <appender-ref ref="STDOUT"/>
                <appender-ref ref="FILE_ERROR"/>
            </root>
            <root level="info">
                <appender-ref ref="FILE_INFO"/>
            </root>
            <root level="debug">
                <appender-ref ref="FILE_DEBUG"/>
            </root>
            <root level="warn">
                <appender-ref ref="FILE_WARN"/>
            </root>
        </loggers>
    </configuration>

In my programm i define logger:

public class Main {

public static Logger LOG = Logger.getLogger(Main.class);

public static void main(String[] args) {
    LOG.debug("Debug message");
    LOG.warn("Warning message");
    LOG.info("Info message");
}

But only in file warn.log i have Warning message, other files create, but empty. What i doing wrong?

This question is duplicated. Please have a look : stackoverflow.com/questions/1839647/… stackoverflow.com/questions/728295/… — Vargan
– Vargan, Commented Apr 27, 2016 at 10:51
Vargan, the answers you specified are for Log4j 1.x. This question is for Log4j 2. — Remko Popma
– Remko Popma, Commented Apr 28, 2016 at 3:37

Community · Accepted Answer · 2017-05-23 10:28:11Z

3

You can only have one logger in the configuration. On that root logger, define multiple Appender-Refs, one for each File appender.

For each Appender-Ref, specify the level, to filter out too detailed events:

<Appender-ref ref="InfoFile" level="info" />

Then, on each File Appender, have a filter that DENIES events that are not exactly the desired level. This filters out events that are too general. See this question for an example.

edited May 23, 2017 at 10:28

CommunityBot

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answered Apr 28, 2016 at 3:44

Remko Popma

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1 Comment

Arr Over a year ago

oh, may you give a simple example, please?

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