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How often do you need to set the configuration file for log4j2?


How often do you need to set the configuration file for log4j2?

By : Tommy Garcia
Date : October 18 2020, 03:08 PM
it helps some times Log4j 2 configures itself on initialisation i.e. whenever a Logger instance is first created within an instance of a JVM, approximately ... the first class in your application which declares a Logger instance causes Log4j 2 to initialise itself. So, the answer to this question ...
code :


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How do you override a log4j2 configuration file with another log4j2 configuration file?

How do you override a log4j2 configuration file with another log4j2 configuration file?


By : Garland
Date : March 29 2020, 07:55 AM
I wish this helpful for you I found a solution that doesn't exactly replicate what I had before, but comes close enough.
Instead of programmatically configuring log4j, I add log4j-web-2.0.jar to my classpath and add the following to my web.xml:
code :
<context-param>
  <param-name>isLog4jAutoInitializationDisabled</param-name>
  <param-value>true</param-value>
</context-param>
<context-param>
  <param-name>log4jConfiguration</param-name>
  <param-value>file:///usr/jboss/ldsconf/log4j2.xml</param-value>
</context-param>

<listener>
  <listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>
</listener>

<filter>
  <filter-name>log4jServletFilter</filter-name>
  <filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>log4jServletFilter</filter-name>
  <url-pattern>/*</url-pattern>
  <dispatcher>REQUEST</dispatcher>
  <dispatcher>FORWARD</dispatcher>
  <dispatcher>INCLUDE</dispatcher>
  <dispatcher>ERROR</dispatcher>
  <dispatcher>ASYNC</dispatcher><!-- Servlet 3.0 w/ disabled auto-initialization only; not supported in 2.5 -->
</filter-mapping>
LOG4J2: Disable "No log4j2 configuration file found.." print when configuring programmatically

LOG4J2: Disable "No log4j2 configuration file found.." print when configuring programmatically


By : user3037132
Date : March 29 2020, 07:55 AM
it fixes the issue I am not using any XML configuration file, rather I am setting the logger configuration programmatically. The logger works correctly but just when I call the first line of the code below, a warning ERROR message shows up to tell me that the configuration file was not found and default configuration will be used. , Add the following system property in order to not show that message:
code :
-Dorg.apache.logging.log4j.simplelog.StatusLogger.level=OFF
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.status.StatusLogger;

...

StatusLogger.getLogger().setLevel(Level.OFF);
No log4j2 configuration file found. Using default configuration: logging only errors to the console

No log4j2 configuration file found. Using default configuration: logging only errors to the console


By : shawnp
Date : March 29 2020, 07:55 AM
Hope that helps I have been dealing with this problem for a while. I have changed everything as described in this post and even thought error occured. In that case make sure that you clean the project when changing settings in .xml or .properties file. In eclipse environment. Choose Project -> Clean
How do I write to a CSV file using the apache log4j2 functionality and the log4j2 configuration file?

How do I write to a CSV file using the apache log4j2 functionality and the log4j2 configuration file?


By : Joss
Date : March 29 2020, 07:55 AM
it should still fix some issue Following the Log4j 2 documentation of the CSV Layout it depends on Apache Commons CSV.
Find below working snippets.
code :
...
<dependencies>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.6.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.6.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-csv</artifactId>
        <version>1.4</version>
    </dependency>
</dependencies>
...
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Properties>
        <Property name="csvLog.fileName">csvLog</Property>
        <Property name="file-header">column1,column2,column3</Property>
    </Properties>
    <Appenders>
        <RollingFile name="csvFile" 
                     fileName="${csvLog.fileName}.tmp"
                     filePattern="${csvLog.filename}-%d{MM-dd-yyyy}-%i.csv" >
            <CsvParameterLayout delimiter="," header="${file-header}\n"/>
            <Policies>
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                <SizeBasedTriggeringPolicy size="10 MB" />
            </Policies>
            <DefaultRolloverStrategy max="200" />
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="debug" additivity="false">
            <AppenderRef ref="csvFile" level="debug"/>
        </Root>
    </Loggers>
</Configuration>
Logger logger = LogManager.getLogger(...);
logger.info("sample output", "foo", "bar");
column1,column2,column3
foo,bar
appenders = csvFile

appender.csvFile.type = RollingFile
appender.csvFile.name = CSVFILE
appender.csvFile.fileName = csvLog.tmp
appender.csvFile.filePattern= csvLog-%d{MM-dd-yyyy}-%i.csv
appender.csvFile.layout.type = CsvParameterLayout
appender.csvFile.layout.delimiter = ,
appender.csvFile.layout.header = column1,column2,column3\n
appender.csvFile.policies.type = Policies
appender.csvFile.policies.time.type = TimeBasedTriggeringPolicy
appender.csvFile.policies.time.interval = 1
appender.csvFile.policies.time.modulate = true
appender.csvFile.policies.size.type = SizeBasedTriggeringPolicy
appender.csvFile.policies.size.size=10MB
appender.csvFile.strategy.type = DefaultRolloverStrategy
appender.csvFile.strategy.max = 200

rootLogger.level = debug
rootLogger.appenderRefs = csvFile
rootLogger.appenderRef.csvFile.ref = CSVFILE
log4J2 to slf4j to log4j1 produces "No log4j2 configuration file found"

log4J2 to slf4j to log4j1 produces "No log4j2 configuration file found"


By : Jose Gonzalez
Date : March 29 2020, 07:55 AM
Hope this helps You need to exclude the dependencies to log4j2, the classes that your libraries depends on will be provided by log4j-to-slf4j.
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