Log4j2 Filter particular level in apender

Question

What filter should i use, to define particular level to be logged with apender? For example:

java:

LOGGER.debug(\"Debug message\");
LOGGER.info(\"Inf         


        

Answer 1

Actually, from your question it looks like you don't want two different appenders, but two different patterns that are using under different circumstances. For that you should just use a PatternSelector.

    <Console name="stdout-message">
      <ScriptPatternSelector defaultPattern="[%logger{36}] [%level] %message %n">
        <Script name="BeanShellSelector" language="bsh"><![CDATA[
          if (logEvent.getLevel() == Level.INFO) {
            return "INFO";
          } else {
            return null;
          }]]>
        </Script>
        <PatternMatch key="INFO" pattern="[%logger{36}] %message %n"/>
       </ScriptPatternSelector>
    </Console>

Answer 2

Here two console appenders. One logs all trace, debug and info levels to std_out, the other logs all warn, error and fatal levels to std_err. This is very useful e.g. within eclipse since std_err is displayed red.

<Console name="STDOUT" target="SYSTEM_OUT">
    <PatternLayout pattern="%d{HH:mm:ss.SSS} (%6r) %-5p [%-7t] %F:%L %x - %m%n" />
    <Filters>
        <ThresholdFilter level="warn" onMatch="DENY" onMismatch="ACCEPT" />
    </Filters>
</Console>

<Console name="STDERR" target="SYSTEM_ERR">
    <PatternLayout pattern="%d{HH:mm:ss.SSS} (%6r) %-5p [%-7t] %F:%L %x - %m%n" />
    <Filters>
        <ThresholdFilter level="WARN" onMatch="ACCEPT" />
    </Filters>
</Console>

Answer 3

It took me very long to figure out how to filter a range of LogLevels via the log4j2.xml configuration file. In the End this worked for me :

<Filters>
    <ThresholdFilter level="trace" />
    <ThresholdFilter level="info" onMatch="DENY" onMismatch="NEUTRAL" />
</Filters>

In this case Log4J will log all messages from Level.TRACE to Level.DEBUG, all levels below Level.DEBUG will be ignored.

Answer 4

This works:

<Console name="info-stdout-message">
    <PatternLayout pattern="[%logger{36}] %message %n" />
    <Filters>

        <!-- Now deny warn, error and fatal messages -->
        <ThresholdFilter level="warn"  onMatch="DENY"   onMismatch="NEUTRAL"/>

        <!-- This filter accepts info, warn, error, fatal and denies debug/trace -->
        <ThresholdFilter level="info"  onMatch="ACCEPT" onMismatch="DENY"/>
    </Filters>
</Console>

Answer 5

Please check all log4j2 filtering possibilities at https://logging.apache.org/log4j/2.0/manual/filters.html

Sample configuration fragment

...    
<Console name="DEFAULT" target="SYSTEM_OUT">
    <PatternLayout>
        <Pattern>[%d][%p][%c:%L:%M] - %m%n</Pattern>
    </PatternLayout>
    <Filters>
        <RegexFilter regex="(?s).*(sql01|sql02|sql03).*" onMatch="DENY" onMismatch="NEUTRAL"/>
    </Filters>
</Console>
...