Questions tagged [log4j2]
Log4j 2 is an upgrade to Log4j, a Java-based logging utility, that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.
log4j2
4,434
questions
291
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Very simple log4j2 XML configuration file using Console and File appender
I'd like a very simple XML configuration file with a console and a file appender using log4j2.
(The Apache Website is killing me with much Information.)
- 14k
189
votes
3
answers
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Is it worth to use slf4j with log4j2
I am not able to decide whether to use slf4j or not with log4j2. Based on online posts, does not look like it will have any performance hit but is it really required.
Also these points rule in favor ...
- 7,013
157
votes
9
answers
140k
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Programmatically change log level in Log4j2
I'm interested in programmatically changing the log level in Log4j2. I tried looking at their configuration documentation but that didn't seem to have anything. I also tried looking in the package: ...
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98
votes
7
answers
195k
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Log4j2 configuration - No log4j2 configuration file found
Lately I decided to learn how to use the log4j2 logger. I downloaded required jar files, created library, xml comfiguration file and tried to use it. Unfortunately i get this statement in console (...
- 1,043
98
votes
1
answer
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What does “status” mean in Log4j2 configuration?
I just have finished adjustment of log4j2.xml configuration file and spotted something I don't really understand. So what is <Configuration status="SOME_STATUS_HERE">?
Almost in all ...
- 3,510
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votes
6
answers
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Caused by: org.apache.logging.log4j.LoggingException: log4j-slf4j-impl cannot be present with log4j-to-slf4j
In my Spring boot 2 project:
In build.gradle:
dependencies {
implementation 'com.google.code.gson:gson:2.7'
implementation 'com.h2database:h2'
implementation 'javax.servlet:jstl:1.2'
...
- 15k
80
votes
17
answers
342k
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No log4j2 configuration file found. Using default configuration: logging only errors to the console
$ java -Dlog4j.configuration=file:///path/to/your/log4j2.xml -jar /path/to/your/jar_file.jar
Written to the console, you get
ERROR StatusLogger No log4j2 configuration file found. Using default ...
- 3,692
76
votes
6
answers
63k
views
Is log4j2 compatible with Java 11?
I tried to run my project on the latest Java 11. Everything works, except the specific file logger. Logging works fine on previous Java versions - 10, 9, 8, but not on Java 11.
During server run I ...
- 12.2k
63
votes
2
answers
72k
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Log4J2 property substitution - default
I just wonder if there is any way to provide default value for property substitution in LOG4J?
I want to pass file path in java system property and then use it with "${env:mySystemProperty}". But ...
- 9,089
63
votes
3
answers
74k
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How to Create a Custom Appender in log4j2?
As disscussed in this link : How to create a own Appender in log4j?
For creating a custom appender in log4j 1.x we have to extend the AppenderSkeleton class and implements its append method.
...
- 1,744
63
votes
10
answers
254k
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ERROR StatusLogger Log4j2 could not find a logging implementation
I am trying to implement log4j 2 but it keeps throwing the following error.
> ERROR StatusLogger Log4j2 could not find a logging implementation.
> Please add log4j-core to the classpath. Using ...
- 1,471
62
votes
3
answers
58k
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Log4j vulnerability - Is Log4j 1.2.17 vulnerable (was unable to find any JNDI code in source)?
With regard to the Log4j JNDI remote code execution vulnerability that has been identified CVE-2021-44228 - (also see references) - I wondered if Log4j-v1.2 is also impacted, but the closest I got ...
- 2,598
61
votes
11
answers
71k
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log4j2 ERROR StatusLogger Unrecognized conversion specifier
I have log4j2 in my project when I run main method in intellij Idea ,it correct to print log.
when i use maven-shade-plugin package project to jar file, and run jar as standalone application it ...
- 809
59
votes
2
answers
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log4j2 specify relative path to tomcat home dir for FileAppender
I am trying to configure log4j2 for my tomcat server running locally. I am unable to pipe the logs to a location that is relative to the tomcat install.
If I specify an absolute path it works. If I ...
- 4,762
57
votes
2
answers
63k
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Log4j2 why would you use it over log4j? [closed]
I must be missing something but I have been looking at this for a few days now, but why on earth would you ever use log4j2 over log4j (other than the performance)?
From what I have seen so far, ...
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55
votes
5
answers
68k
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How to add Log4J2 appenders at runtime programmatically?
Is it possible to add Log4J2 appenders programmatically using the specifications from the XML configuration?
I plan to define it all in the log4j2.xml and then pick appenders situationally like this (...
- 1,629
52
votes
5
answers
91k
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log4j2 xml configuration - Log to file and console (with different levels)
I want to do two things:
Log to console with a certain log-level
Log to file with another log-level
Console logging seems to work just fine but the log file keeps beeing empty.
This is my log4j2....
- 3,460
52
votes
4
answers
60k
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Log4J2 - assigning file appender filename at runtime
I have a log4j2.xml config file in the class path. One of the appenders is a File appender, and I would like to set the target file name at run time in the Java application.
According to the docs I ...
- 1,225
51
votes
8
answers
58k
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log4j 2 adding multiple colors to console appender
Hi I just downloaded and configured log4j-2. I am stuck on applying color codes to the SlowConsole console appender. My console appender is like below.
<?xml version="1.0" encoding="UTF-8"?>
&...
- 2,214
51
votes
7
answers
72k
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Where to put formatMsgNoLookups in the Log4j XML configuration file
I configure my Log4j with an XML file. Where should I add the formatMsgNoLookups=true?
<?xml version="1.0" encoding="UTF-8"?>
<!-- Upload files compare config -->
<...
- 2,791
50
votes
9
answers
71k
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Load Log4j2 configuration file programmatically
I want to load Log4j2 XML configuration file programmatically from my application.
Tried this:
ConfigurationSource source = new ConfigurationSource();
source.setLocation(logConfigurationFile);
...
- 3,833
48
votes
4
answers
40k
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Using log4j2 with slf4j: java.lang.StackOverflowError
So I have tried following this (non-maven implementation) and requirements in their web site for adding slf4j to log4j. and tried using this code
public static void main(String[] args) {
...
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43
votes
4
answers
34k
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In Log4j2, how do I associate an XML Schema with log4j2.xml?
I have been giving the new Log4j2 a go. It seems, from the documentation on migration, that the XML Schema/DTD specification has been done away with.
That seems like a step backwards. Surely it ...
- 22.1k
41
votes
5
answers
62k
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ERROR StatusLogger Reconfiguration failed: No configuration found for '73d16e93' at 'null' in 'null'
I am using log4j2 the jar files are following:
log4j-api-2.14.0.jar
log4j-core-2.14.0.jar
log4j-slf4j-impl-2.14.0.jar
Executing the following line:
LogManager.getLogger("com.foo.Bar1");
...
- 411
41
votes
9
answers
98k
views
How to specify Log4J 2.x config location?
Is there any way to specify Log4J 2.x log4j2.xml file location manually (like DOMConfigurator in Log4J 1.x), without messing with classpath and system properties?
- 3,942
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votes
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answer
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How does Log4j2 DefaultRolloverStrategy's max attribute really work?
I've configured a RollingRandomAccessFileAppender with only the OnStartupTriggeringPolicy set, but when I set the max attribute of the DefaultRolloverStrategy to some number, the logs keep generating ...
- 3,166
37
votes
8
answers
70k
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Method getLogger() no longer a member of Logger in log4j2?
I have the log4j-api-2.0.0.jar and log4j-core-2.0.2.jar import into my build path. But somehow the following code were fail:
import org.apache.logging.log4j.core.Logger;
public class TheClass {
...
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33
votes
8
answers
98k
views
Time based triggering policy in log4j2
I am trying to create new log files on an hourly basis. I am using TimeBasedTriggerringPolicy of lo4j2 in RollingFileAppender. Below is the sample xml configuration code i have taken from log4j2 ...
- 365
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votes
2
answers
19k
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LogManager.getLogger() is unable to determine class name on Java 11 [duplicate]
I'm using log4j2 (2.11.1) with Java 11 and attempting to get a Logger object using:
private static final Logger LOG = LogManager.getLogger();
(Imported from log4j-api in org.apache.logging.log4j)
...
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32
votes
1
answer
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Mixing log4j 1.x and log4j 2
I have a new application that is being written using log4j2, to take advantage of some of its new features. One of the libraries it uses is a bit older and was built with log4j 1.x. I'm having a ...
32
votes
5
answers
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How to configure log4j 2.x purely programmatically?
How do I configure log4j 2.3 with console appender pure programmatically (no configuration files of any format)?
Basically I'm looking for 2.x version of this 1.x code.
In my classes I would then ...
- 13.1k
32
votes
4
answers
29k
views
Log4j2 configuration not found when running standalone application built by shade plugin
I have application which when I run from maven log4j2 it is working:
mvn exec:java -Dexec.args=...
but when I run jar as standalone application then it shows error:
java -jar
log:
ERROR ...
- 16k
31
votes
6
answers
50k
views
Log4j2 - configuring
I am trying to adopt Log4j2 in my new project, but I get my logs in catalina.out, and the first one is always: ERROR StatusLogger Unable to locate a logging implementation, using SimpleLogger. It ...
- 9,466
31
votes
3
answers
54k
views
Log4j 2 doesn't support log4j.properties file anymore?
I am running an example using log4j 2.0-rc1 and log4j.properties file, but log4j lib always runs it with the default configuration (log level, appender, etc). I also tried changing the name to log4j2....
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votes
2
answers
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Difference between AsyncLogger and AsyncAppender in Log4j2
I have understanding that AsyncAppender do the appending job in a separate thread. They use ArrayBlockingQueue for this purpose.
AND
AsyncLogger uses LMAX disruptor library to move logging event from ...
- 1,744
31
votes
1
answer
30k
views
In log4j 1.2 to log4j 2 migration, what to do with the DailyRollingFileAppender class?
I'm working on migrating a Java project from using log4j 1.2 for logging to using log4j 2.
log4j 1.x has a class org.apache.log4j.DailyRollingFileAppender which is mentioned in my project's log4j....
- 14.3k
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votes
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answers
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How to log within shutdown hooks with Log4j2?
Log4j2 also uses shutdown hooks to end it's services. But of course I want to log throughout the whole lifecycle of my application - shutdown included. With Log4j this was no problem. Now it seems to ...
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votes
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slf4j & log4j2 maven setup query
I am using log4j2 and slf4j in my project & using maven for the build. I am using the following pom file (releveant dependencies shown only) but I am getting the error copied below with this pom ...
user3813256
28
votes
8
answers
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views
How can I change the default location of log4j2.xml in Java Spring Boot?
Log4j2 is working nicely with Spring Boot through the log4j2.xml configuration file in the root classpath, exactly as the documentation states.
When trying to move this file to a different location ...
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votes
5
answers
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Migrating from log4j to log4j2 - properties file configuration
I have a Java application which is using log4j configured as below.
log4j.properties:
log4j.rootLogger=INFO, R
log4j.appender.R = org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File = /...
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votes
2
answers
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How to set the log level on a class in log4j2 properties
In log4j I could specify a class in the properties file to log at the debug level like this:
log4j.logger.com.mycompany.mypackage.ClassName=DEBUG
How do I do this in log4j2? Note I still need to use ...
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votes
1
answer
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What is a sample default config file in YAML for log4j2?
The documentation for log4j2 configuration provides a nice sample XML document equivalent to the default configuration:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">...
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votes
2
answers
24k
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Configuring log4j2 and log4j using a single log4j2 xml file
I've migrated my application to log4j 2, and I've configured it via log4j2.xml
However, some of the libraries I'm using depend on log4j 1. If I run the application using:
-Dlog4j.configurationFile=...
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2
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Why is Logback the default logging framework in Spring Boot? [closed]
I've tried to search on Spring documentation + articles on the internet + questions from Stackoverflow but I didn't find any information about it.
For me the configuration of Log4J2 (especially the ...
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5
answers
18k
views
How to colorize Log4j2 output on console in intelliJ?
I've tried to change the config file to like below but still, the output is plain white. How can I change it to any color? Like different color for each level.
Code:
import org.apache.log4j.*;
...
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26
votes
4
answers
66k
views
Specifying Log4j2 Configuration File When Using Executable JAR
I am having trouble specifying the Log4j2 config file location when using an executable JAR file. It works fine if I separate all the JARs, but when I try to combine them into one executable JAR file, ...
- 2,155
26
votes
2
answers
17k
views
My log4j2 log file always have double output of each line. How can I stop the duplication please?
My log4j2 log file always has double output of each line. How can I stop the duplication please?
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN&...
- 279
26
votes
4
answers
21k
views
Reload log4j2 configuration on demand
I have my log4j2.xml config file set to be checked every 30 seconds:
<Configuration status="WARN" monitorInterval="30">
...
</Configuration>
Is it possible to programmatically tell ...
- 2,227
26
votes
2
answers
17k
views
BasicConfigurator replacement in log4j2
I am working on a log4j 1 to log4j 2 migration. Inside a AppConfigInitializer file we use something like this -
BasicConfigurator.configure(consoleAppender);
What shall I replace this with to get ...
- 7,013
26
votes
4
answers
54k
views
Dynamically add appender with slf4j and log4j2
I want to dynamically create an appender and add it to a logger. However, this seems not to be possible with slf4j. I can add my appender to a log4j logger but then I fail to retrieve the logger with ...
- 1,772