method name not printing correctly in log4j logger in Java

Question

My log happens in getParam() method. but it is logged as main method. And I have three objects, but I do not see any information as to which object is logging. I want that information too.

Here is the output:

INFO  [main]: info
INFO  [main]: debug
INFO  [main]: trace

here is the code:

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

class Log4jTest {

    private static Logger log=Logger.getLogger(Log4jTest.class);
    private String param;

    public Log4jTest(String param){
        this.param=param;
    }

    public String getParam(){
        log.info(param);
        return param;
    }

}

public class Log4j_testing {
    public static void main(String[] args) throws FileNotFoundException{
        Log4jTest l1= new Log4jTest("info");
        l1.getParam();
        Log4jTest l2= new Log4jTest("debug");
        l2.getParam();
        Log4jTest l3= new Log4jTest("trace");
        l3.getParam();
    }
}

my log4j.properties:

log4j.rootLogger=INFO, 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
log4j.appender.stdout.layout.ConversionPattern=%-5p [%t]: %m%n

On a different note: if I have the above commented line uncommented and the last line commented out, I get

11:19:41,586  INFO Log4jTest:19 - info
11:19:41,589  INFO Log4jTest:19 - debug
11:19:41,589  INFO Log4jTest:19 - trace

It gives the correct line number(19) that is being logged, but not the correct method.

Answer 1

Add %M to your pattern. However, as it is stated in the JavaDoc: "Generating caller location information is extremely slow and should be avoided unless execution speed is not an issue. "