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

Question

$ java -Dlog4j.configuration=file:///path/to/your/log4j2.xml -jar /path/to/your/jar_file.jar

Written to the console, you get

ERROR          


        

Answer 1

Problem 1

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

Solution 1

To work with version 2 of log4j aka "log4j2"

-Dlog4j.configuration=

should read

-Dlog4j.configurationFile=

• 1.2 manual: http://logging.apache.org/log4j/1.2/manual.html
• 2.x manual: http://logging.apache.org/log4j/2.x/manual/configuration.html

Problem 2

log4j:WARN ....

Solution 2

In your project, uninclude the log4j-1.2 jar and instead, include the log4j-1.2-api-2.1.jar. I wasn't sure how exactly to exclude the log4j 1.2. I knew that what dependency of my project was requiring it. So, with some reading, I excluded a bunch of stuff.

    org.apache.kafka
    kafka_2.10
    0.8.2.0
    
        
            org.apache.logging.log4j
            log4j-core                
        
        
            org.apache.log4j
            log4j-core
        
        
            log4j
            log4j
                  
    

I am not sure which of the exclusions did the trick. Separately, I included a dependency to the 1.2 api which bridges to 2.x.

    org.apache.logging.log4j
    log4j-1.2-api
    2.2

Now, the 1.2 logs which were only going to the console actually flow to our 2.x appenders.