I have properties file
# Root logger option
log4j.rootLogger= INFO , stdout
# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
And java file
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class HelloWorld {
static final Logger log = LogManager.getLogger(HelloWorld.class);
public static void main(String[] args){
log.info("Test");
}
}
Everything is set but there is no output on the Console. That's log4j 2.0. What am i doing wrong?
You cannot use a log4j-1.2-style properties file to configure log4j2. Log4j2 needs an xml configuration file. It expects this file to be called "log4j2.xml" and placed in the classpath (although it is possible to specify a different location for this file). The manual has all the details. The manual also has many, many configuration examples to help you get started.
Related
I added Log4j2 to the project, and added config.
# Root logger option
log4j.rootLogger=INFO, file, stdout
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\\logging.log
log4j.appender.file.MaxFileSize=10MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
Than, I log code like here:
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
...
final static Logger logger = LogManager.getLogger(AbstractEditor.class);
...
logger.info("updated: " + entity);
logger.debug("==> debug");
logger.info("==> info");
logger.warn("==> warn");
logger.error("==> error");
logger.fatal("==> fatal");
logger.trace("==> trace");
As I understand, all logs with level higher than DEBUG must be written to console and file. But only this has been printed into console:
15:08:52.285 [http-nio-8080-exec-1] ERROR ru.example.AbstractEditor - ==> error
15:08:52.292 [http-nio-8080-exec-1] FATAL ru.example.AbstractEditor - ==> fatal
I see this strings not matches my config. And they are not witten into file. When I added this config, all logs disappeared from console, excluding this 2 strings.
Please help to write config to see all logs with level from DEBUG on console and file.
You are programmatically using Log4j 2 but using the configuration format of Log4j 1. Log4j 2 is ignoring your configuration and using the default. You have 2 choices.
Convert your configuration to use Log4j 2 syntax (recommended), or
Enable Log4j 2's experimental support for log4j 1 configuration files by setting the system property "log4j1.compatibility=true". This support was added in release 2.13.0 so you would have to be using that version. The property file would also have to be named log4j.properties, not log4j2.properties.
I have to perform basic logging on my application for which I am using Log4j. I have set up log.properties file inside resource folder with desired configuration but am getting the following warning when I try to log information
log4j:WARN No appenders could be found for logger (com.MyClass).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
This is my property file located under resource folder :
# Root logger option
log4j.rootLogger=DEBUG, ERROR, stdout, file
# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
# Redirect log messages to a log file, support file rolling.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./resources/application.log
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
This is what my project structure looks like :
src
-> main
-> java
....
-> resources
--> log.properties
Every folder is present in java build path of the project as well.
This is how am calling just to test:
public class Demo {
final static Logger logger = Logger.getLogger(Demo.class);
public static void main(String[] args) {
logger.debug("demo");
}
}
Can u try to rename the file to log4j.properties and also
log4j.rootLogger=DEBUG,ERROR stdout, file
line should have either debug or error not both
I'm trying to use log4j in my Java application (no web-app). Therefore I added the configuration file directly within my /src folder.
log4j.properties
log4j.rootLogger=DEBUG
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
My main class is in a package with a sub-namespace and within there I'm trying to log as follows:
final static Logger logger = Logger.getLogger(MainClass.class);
public static void main(String[] args) {
//BasicConfigurator.configure();
logger.warn("some warning");
}
But still I'm getting an error message and I don't know what to do. You see the commented line BasicConfigurator above. As far as I know, the log4j.properties should be read without calling that line, right?
log4j:WARN No appenders could be found for logger
(at.company.project.poi.MainClass). log4j:WARN Please initialize the
log4j system properly. log4j:WARN See
http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
According to documentation, file should be on classpath and named 'log4j2.properties'
You can also set directly the configuration by setting -Dlog4j.configurationFile="<your config filepath>"
Source: https://logging.apache.org/log4j/2.x/manual/configuration.html
I am stuck. I have a configuration issue in setting up log4j with Spring MVC. Getting the below error.
log4j:WARN No appenders could be found for logger (org.springframework.web.servlet.DispatcherServlet).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Here is my controller code
public class HelloWorldController {
private static Logger logger = Logger.getLogger(HelloWorldController.class);
int first_no=10;
int second_no=10;
int summation;
#RequestMapping("/helloworld")
public String helloWord(ModelMap modelview){
summation=first_no+second_no;
System.out.println("Inside hello world");
logger.info("Hello, World!");
modelview.addAttribute("message", summation);
return "helloworld";
}
}
Here is my log4j.properties file
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
# Root logger option
log4j.rootLogger=debug, file, stdout
I have kept the file under src/resources in eclipse. Can anyone help me out with this? I am stuck.
Probably log4j.properties file is not in the classpath.Move the log4j.properties in src folder in Eclipse and under WEB-INF/classes when deployed in the Container.
I want to log my application output to a file hosted on my tomcat server. log4j.properties set is:
log4j.rootLogger=INFO, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.R.MaxFileSize=1000KB
log4j.appender.R.MaxBackupIndex=5
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=${catalina.home}/logs/initiate.log
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d %p [%c] - %m%n
It does create initiate.log file but my log statements are not added to it. What is the issue? Or how will I set the properties using java Logger to output to fil
You need to define a way to access file logger somewhere in your java code
import org.apache.log4j.Logger;
private static Logger logger= Logger.getLogger("R");//fileLoggerName: R in this case
and then access the file like below
logger.error("Whatever message is!!");
//OR
logger.info("message to write", exceptionObjectForCompleteTrace);