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Log4j doesn't write logs to file

I'm using slf4j over log4j.
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.12</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.12</version>
</dependency>
The log4j.properties is in WEB-INF folder and has the following content:
log4j.rootLogger=DEBUG, stdout, file
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
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=D:\\logs\\log4j.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
On another enviroment with same version of Tomcat the same respository works just fine, logging to the file...

You said that this same configuration file was working fine on a different environment. Can you give a little detail on the differences between the environments. e.g. are they both on Windows? The fact that is was working fine on another environment suggests that your configuration is fine, but there is some issue with your environment. Here are a few things to check:
Does the tomcat process has permissions to write to that file - i.e. are administrator rights required to write to D:\logs\log4j.log?
Make sure that there aren't any temporary files lying around tomcat's directories which may be preventing your changes from taking effect. To be sure, stop tomcat, delete the expanded war from %CATALINA_HOME%\webapps, delete the contents of %CATALINA_HOME%\temp and %CATALINA_HOME%\work
Check that you don't have any other log4j config files on your classpath, as these could be overriding your log4j file and preventing it from taking effect. To double check this, you could try temporarily removing your log4j.properties file to see if you get messages saying that the logging system is not initialised properly.

Perhaps your log4j.properties isn't being read at all. If it's not found, then log4j will use a default configuration and you might not even know about it.
Try to pass this line
-Dlog4j.configuration=file:///D:/yourPathToFile/log4j.properties
as a VM Argument in your run configuration and see if it helps.

For a Maven Based Project keep your log4j.properties in src/main/resources

I had the same problem, putting the log4j.log in source work. I thought it was getting compiled in the EAR file, but was not. Assuming it was using default.

Instead of:
log4j.appender.mainAppender.File=mainloggs.log
log4j.appender.mainAppender.Append=true
use:
log4j.appender.file.File=mainloggs.log
log4j.appender.file.Append=true

Your log4j.properties file should be in WEB-INF/classes, not WEB-INF. WEB-INF is not in the web application classpath, but WEB-INF/classes is.

Try with
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.Append=true
If it not working. Please put your web.xml

The issue might be coming when you won't add the log4j.properties file in your classpath. To fix the same follow the steps below:-
Create a folder resources in project and put your log4j.properties in it.
Go to project properties --> Java Build Path -->Click on Add Folder -->Check the resources folder -->Click ok and its done. It should solve your problem.

I had the same problem. It used to work a while ago but not working now.
I guess this is not a problem with log4j2 or slf4j(as was in my case) but instead with the relative path to the config file.
If you have updated java or update IDE or changed some system variable or relative path of the folders then your problem is similar to mine.
Possible fixes/workarounds -
Try including the log4j2 configuration file in the artifact while
building it.
Alternatively you can get config from propertied file and hardcode
the logging in code itself - This was what worked for me.

Try using the scheme when mentioning file paths on windows. Does not need to mention it this way on other platforms but on windows you need to. I have observed issues regarding file paths without scheme.
log4j.appender.file.File=file://d:/logs/log4j.log

So I had a similar issue with the .log file not being written to when writing a web app on tomcat. In the end I changed the file path to be relative with something like .\log.log. Then I noticed that when I ran the program using tomcat 7 I found the log file in the \bin directory instead of the \log directory inside my tomcat installation.

log4j.appender.file.File=${user.home}\\Logs\\mylogfile.log

I had the same issue. Turns out, I have another web application inside Tomcat that contain another log4j.properties file. After removing this application, things are working as expected

I had this problem when migrating log4j1 to log4j2 through the Log4j 1.x bridge (log4j-1.2-api)
My logj1 configuration was correct and the log4j2 and bridge JARs were correctly placed but I forgot this step. So adding this JVM parameter worked:
-Dlog4j1.compatibility=true

Using simple Log4j.properties in my java code

I made a simple Hibernate 3.1 java code (in eclipse) which successfully creates a table in a database. I have slfj-api-1.6.0.jar and slfj-simple-1.6.0.jar in my project. But, I don't see any Log4j logging warnings or messages in the console output. How do I make log4j log things to my console ?
My tutorial says that one of the lines I should get in the console is -
log4j.logger.org.hibernate.type = debug
I saw a couple of posts online which tell me to place a Log4j.properties file in my java project, either in src folder, or make a resources folder inside src and put it there. I found one Log4j.properties in my computer and placed it in the resources folder. I am not sure if I should use the settings in that file or how to edit this file as per my requirement. How do I do this correctly ?
EDIT -
The 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
### set log levels - ###
log4j.rootLogger=warn, stdout log4j.logger.org.hibernate.info
### log JDBC bind parameters ###
log4j.logger.org.hibernate.type=debug
###log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug
Thanks.

First of all, the file name must be in lowercase. The Log4j.properties file is wrong, it's log4j.properties. This must be put in the root folder of your project (in most cases the src folder).
Secondly, you need to download the log4j jar file if you want to use SLF4J bridge with log4j. Download the latest library that you require from Apache Logging Services. Don't forget that there are 2 versions of Apache Log4J, so I suggest you try version 1.x first.
Good luck!

One thing to note is that the file should be called log4j.properties and should be placed in the root of your src or resource folder (by default at least) ... you seem to be calling it Log4j.properties
I also think that you are missing the following dependency:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.1</version>
</dependency>

The resources folder is only an option if you identify it as a source folder on the project properties!java build path!source tab.
Slf4j does not use log4j to write to the logs unless you include the slf4j-log4j[version].jar (for example, slf4j-log4j12-1.7.7.jar) jar in your project. If you include this jar, then you must not include the slfj-simple-1.6.0.jar jar in your project.
Here is a link to the slf4j online manual

Warning in Initializing log4j

I am getting the following error while running a struts application.
13/04/19 12:42:21 log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
13/04/19 12:42:21 log4j:WARN Please initialize the log4j system properly.
13/04/19 12:42:21 log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
My log4j.properties file is:
log4j.threshold=ALL
log4j.rootLogger=ALL,DebugAppender,InfoAppender,RECEIPTAppender
#log4j.rootLogger=DEBUG,DebugAppender
log4j.category.DebugAppender.access=DEBUG
log4j.appender.DebugAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DebugAppender.Threshold=DEBUG
log4j.appender.DebugAppender.File=C:/APWD/ServerLogs/debug/assampwd.log
log4j.appender.DebugAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.DebugAppender.layout.ConversionPattern=%d |[%t]| %-5p |%c |- |%m|%n
#log4j.rootLogger=INFO,InfoAppender
log4j.category.InfoAppender.access=INFO
log4j.appender.InfoAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.InfoAppender.Threshold=INFO
log4j.appender.InfoAppender.File=C:/APWD/ServerLogs/debug/assampwd.log
log4j.appender.InfoAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.InfoAppender.layout.ConversionPattern=%d |[%t]| %-5p |%c |- |%m|%n
#log4j.logger.com.ctmis.hibernate=ERROR, RECEIPTAppender
log4j.category.RECEIPTAppender.access=ERROR
log4j.appender.RECEIPTAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.RECEIPTAppender.Threshold=ERROR
log4j.appender.RECEIPTAppender.File=C:/APWD/ServerLogs/debug/assampwd.log
log4j.appender.RECEIPTAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.RECEIPTAppender.layout.ConversionPattern=%d |[%t]| %-5p |%c |- |%m|%n
My log4j.properties file is in WEB-INF folder. I have found similar topics in stackoverflow, but didnot work out for me, so I post it. Would really appreciate if someone can help me out, Its a warning message, but causing some module not working in the application.
Thanks

Your log4j.properties file needs to be in the root of your classpath. Copy the file into the WEB-INF/classes folder inside your war file.
If you are using Maven, this should involve moving your file into the src/main/resources folder of your project before running the packaging command.

The log4j configuration file needs to be in the root of the classpath. In netbeans, when you create a web application project, the path is src\java. You can see the source packages folders with a right click on the project -> Properties -> soruces. You can place the file in src\java folder or make a new folder and add it from the project properties menu.

Log is not working inside the java file. But works inside the servlet

I have issue in executing the logs. I have two projects: one is a servlet and the other one is a simple java file. private static Logger logger=Logger.getLogger(myServiceServlet.class); This was working fine. Its writing log wen i start running the Tomcat server. But the same thing is not achieve in my simple java file, it converted into WS and try to deploy in axis/Tomcat server
Servlet is directly running in Tomcat server.
But java file is converted into Webservice.aar inside the Axis2--->Tomcat server.
Log Properites
# Log levels
log4j.rootLogger=INFO,CONSOLE,R
# Appender Configuration
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
# Pattern to output the caller's file name and line number
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
# Rolling File Appender
log4j.appender.R=org.apache.log4j.RollingFileAppender
# Path and file name to store the log file
log4j.appender.R.File=C:/res backup/apache-tomcat-6.0.35/webapps/mylog/logs/servicelog.log
log4j.appender.R.MaxFileSize=2048KB
# Number of backup files
log4j.appender.R.MaxBackupIndex=50
# Layout for Rolling File Appender
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d - %c - %p - %m%n`

The .aar files are not running in the same context as the JARs in WEB-INF/lib.
They share some kind of context as you can load references to the WEB-INF/lib classes, however its not 100% consistent at this point.
I would recommend you build some kind of wrapper in your .aar files that do nothing else then forwarding the calls into methods of JAR files that are situated in WEB-INF/lib.
You just need to make sure you load the reference from the .aar to the methods in WEB-INF/lib context correctly.
To throw errors in the .aar classes I would recommend you catch them and then throw an "AxisFault".
throw new AxisFault(err.getMessage());
http://axis.apache.org/axis2/java/core/api/org/apache/axis2/AxisFault.html
That way we have have been able to solve almost all our issue with the context of .aar files.
Sebastian

log4j log file not getting updated

I am using a apache's log4j for logging errors in my application. When I start the tomcat server, the log info information is written into the log file as expected (Also the log info is written into the log file when I stop the tomcat server). But when I start using the application, I log information I am expecting to be written through the app is not written into the log file. For e.g. I am giving inputs that will give exception, but the log.error(e,e) isn't getting written in the log file.
this is how i am using the Logger
static Logger log = Logger.getLogger(MyClass.class);
log.info("my message" );
log.error(e,e);
Please help
EDIT: Adding log4j.properties file contents
log4j.rootLogger =INFO, FILE, stdout
log4j.appender.FILE=org.apache.log4j.RollingFileAppender
log4j.appender.FILE.File=${catalina.home}/logs/myapp.log
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=%d{ABSOLUTE} %5p\t\t%c{1} :%L - %m%n

It seems that you have not configured your logger. Please find log4j.xml or logging.properties typically located under TOMCAT_HOME/conf. Edit them to include your application's package.
This will help you to write your application level log messages to log file of your server (tomcat).
Better way is to manage your own logging configuration and files. Create log4j.xml file and put it under WEB-INF/classes into your application. You can find a lot of examples and tutorials that will help you to write your log4j.xml. For example this one: http://logging.apache.org/log4j/1.2/manual.html