Is there way to specify current line number in log4j pattern

Question

I have a pattern to output to console and log file in following format:

[INFO]  17:31:12 - Checking Bla Bla Bla 
[INFO]  17:31:12 - ************* Starting *********************
[INFO]  17:31:12 - Testing Begins

is there any way to append line count so that it looks like:

[001][INFO] 17:31:12 - Checking Bla Bla Bla 
[002][INFO] 17:31:12 - ************* Starting *********************
[003][INFO] 17:31:12 - Testing Begins

I doubt that the standard appenders would do this, but you can always write your own appender. — Stephen C
– Stephen C, Commented Dec 16, 2018 at 23:56
You want to append the count of lines in the log file? Like literally how many lines the log file is up to that point? I'm sure there's a standard unix command that could do it, and at least one Java class that will track lines as they are read. — markspace
– markspace, Commented Dec 17, 2018 at 0:00

ProgrammersBlock · Accepted Answer · 2018-12-17 04:47:38Z

9

In Log4j 1, the symbols can be seen here http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html

Line Number is %L.

In Log4j 2, the symbol is also %L

https://logging.apache.org/log4j/2.0/manual/layouts.html#Pattern_Layout

answered Dec 17, 2018 at 4:47

ProgrammersBlock

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Suraj Rao · Accepted Answer · 2021-01-25 17:25:57Z

6

Try below conversion pattern

ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

edited Jan 25, 2021 at 17:25

Suraj Rao

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answered Jan 25, 2021 at 16:51

MukeshKoshyM

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Sucheth Shivakumar · Accepted Answer · 2018-12-17 05:36:36Z

2

Is it line number or count of log lines ordered in sequence ?

if it is line number you can use %L (Used to output the line number 
from where the logging request was issued.)

https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html

answered Dec 17, 2018 at 5:36

Sucheth Shivakumar

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