log4j:WARN No appenders could be found for logger in web.xml

Question

I already put the log4jConfigLocation in web.xml, but I still get the following warning:

log4j:WARN No appenders could be found for logger ⤦
    ⤥ (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.

What did I miss?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
    "java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/applicationContext.xml
        </param-value>
    </context-param>
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/classes/log4j.properties</param-value>
    </context-param>

    <listener>
        <listener-class>
            org.springframework.web.util.Log4jConfigListener
        </listener-class>
    </listener>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

    <servlet>
        <servlet-name>suara2</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>suara2</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

See also the question [No appenders could be found for logger(log4j)?](http://stackoverflow.com/questions/12532339/no-appenders-could-be-found-for-loggerlog4j#) — PJTraill, Jun 15 '16 at 17:24

score 44 · Accepted Answer · answered Aug 12 '09 at 13:39

44

If that's the entire log4j.properties file it looks like you're never actually creating a logger. You need a line like:

log4j.rootLogger=debug,A1

answered Aug 12 '09 at 13:39

CodeGoat

1,186
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@Kaffiene: it seems it's you who are not reading the entire question (in this case one of the author's comments to the question provide the information to which the answer refers). @CodeGoat: +1 for reading all comments. – Francisco Alvarado May 19 '11 at 17:16
@FranciscoAlvarado I have `log4j.properties` file in class path, still warn displays in console. – UdayKiran Pulipati Mar 18 '14 at 08:14

Alain O'Dea · Answer 2 · 2015-11-17T17:25:16.577

I had log4j.properties in the correct place in the classpath and still got this warning with anything that used it directly. Code using log4j through commons-logging seemed to be fine for some reason.

If you have:

log4j.rootLogger=WARN

Change it to:

log4j.rootLogger=WARN, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.conversionPattern=%5p [%t] (%F:%L) - %m%n

According to http://logging.apache.org/log4j/1.2/manual.html:

The root logger is anonymous but can be accessed with the Logger.getRootLogger() method. There is no default appender attached to root.

What this means is that you need to specify some appender, any appender, to the root logger to get logging to happen.

Adding that console appender to the rootLogger gets this complaint to disappear.

@udaykiranpulipati you can paste this into log4j.properties. If you don't have log4j.properties create it in src/main/resources/ if using SBT/Gradle/Maven/etc. Otherwise put it somewhere that it will end up at the root of the classpath (maybe in src/). — Alain O'Dea, Mar 20 '14 at 18:16

score 19 · Answer 3 · edited Dec 02 '15 at 03:06

19

You may get this error when your log4j.properties are not present in the classpath.

This means you have to move the log4j.properties into the src folder and set the output to the bin folder so that at run time log4j.properties will read from the bin folder and your error will be resolved easily.

edited Dec 02 '15 at 03:06

slm

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answered Feb 03 '10 at 09:41

prabhat

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1

I have the same problem in a desktop application (Applet). The file log4j.properties is already in the src folder. How do I "set the output to the bin folder"? – Dilshad Rana Nov 16 '15 at 16:27

score 7 · Answer 4 · answered Aug 12 '09 at 13:32

7

You'll see this warning if log4j can't find a file "log4j.properties" or "log4j.xml" anywhere.

answered Aug 12 '09 at 13:32

Aaron Digulla

321,842
108
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820

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i confirm the location is correct . coz when i rename log4j.properties to other name, it give error – cometta Aug 12 '09 at 13:37

score 7 · Answer 5 · edited Apr 23 '11 at 08:00

Or, you could be doing what I did and define the logger before the log configuration file has been loaded. This would be as they say: "Putting the cart before the horse."

In the code:

public static Logger logger = Logger.getLogger("RbReport");

... later on

PropertyConfigurator.configure(l4j);
logger = Logger.getLogger("RbReport");

Fix was to initialize the logger after the configuration was loaded.

For the geeks it was "Putting Descarte b4 d horse".

score 5 · Answer 6 · edited Apr 22 '14 at 07:28

If you want to configure for the standalone log4j applications, you can use the BasicConfigurator. This solution won't be good for the web applications like Spring environment.

You need to write-

BasicConfigurator.configure();

or

ServletContext sc = config.getServletContext();
String log4jLocation = config.getInitParameter("log4j-properties-location");
String webAppPath = sc.getRealPath("/");
String log4jProp = webAppPath + log4jLocation;
PropertyConfigurator.configure(log4jProp);

score 4 · Answer 7 · answered Dec 13 '10 at 20:49

If still help, verify the name of archive, it must be exact "log4j.properties" or "log4j.xml" (case sensitive), and follow the hint by "Alain O'Dea". I was geting the same error, but after make these changes everthing works fine. just like a charm :-). hope this helps.

score 3 · Answer 8 · edited Nov 02 '20 at 23:15

3

Put these lines in the beginning of web.xml:

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:/main/resources/log4j.xml</param-value>
</context-param>

edited Nov 02 '20 at 23:15

cela

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answered Apr 20 '14 at 11:58

MariemJab

689
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14

You don't need to specify the log4jConfigLocation. It would take from the classpath. – Krishna Apr 22 '14 at 07:24
have you added xml file inside classes folder? – Krishna Apr 23 '14 at 06:29
my log4j is under src/main/resources/log4j.xml (I am using spring integration and my config fileis under src/min/resources/META-INF/spring/integration/spring-integration-context.xml) – MariemJab Apr 23 '14 at 08:55
resources folder under classpath? – Krishna Apr 25 '14 at 04:52

score 3 · Answer 9 · edited May 26 '17 at 23:12

In my case the solution was easy. You don't need to declare anything in your web.xml.

Because your project is a web application, the config file should be on WEB-INF/classes after deployment. I advise you to create a Java resource folder (src/main/resources) to do that (best pratice). Another approach is to put the config file in your src/main/java.

Beware with the configuration file name. If you are using XML, the file name is log4j.xml, otherwise log4j.properties.

score 1 · Answer 10 · answered Mar 10 '15 at 16:37

OK, I see a lot of answer and some very correct. However, none fixed my problem. The problem in my case was the UNIX filesystem permissions had the log4j.properties file I was editing on the server as owned by root. and readable by only root. However, the web application I was deploying was to tomcat couldn't read the file as tomcat runs as user tomcat on Linux systems by default. Hope this helps. so the solution was typing 'chown tomcat:tomcat log4j.properties' in the directory where the log4j.properties file resides.

score 1 · Answer 11 · answered Dec 22 '17 at 11:19

Add log4jExposeWebAppRoot -> false in your web.xml. It works with me :)

<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>path/log4j.properties</param-value>
</context-param>
<context-param>
    <param-name>log4jExposeWebAppRoot</param-name>
    <param-value>false</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

score 0 · Answer 12 · answered Sep 03 '14 at 14:11

I had the same problem . Same configuration settings and same warning message . What worked for me was : Changing the order of the entries .

I put the entries for the log configuration [ the context param and the listener ] on the top of the file [ before the entry for the applicationContext.xml ] and it worked .

The Order matters , i guess .

log4j:WARN No appenders could be found for logger in web.xml

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