Log4j: Log only message string without logging className and other details

Question

I have a java application and I am using log4j2. I want to only log the log message without logging things like className, log level, timestamp etc. I do see some suggestions regarding custom appender etc. But isn't there a simpler way to achieve this by just modifying the default configuration ?

Example:

log.info(" Hi This is a log message");

Desired Log statement

Hi This is a log message

show your log message and let me know the pattern you want – TheSprinter Dec 12 '18 at 07:49 — TheSprinter, Dec 12 '18 at 07:49
Thanks for replying. Edited with an example – Andy897 Dec 12 '18 at 07:54 — Andy897, Dec 12 '18 at 07:54

score 2 · Answer 1 · answered Dec 12 '18 at 08:02

2

You have to change config file log4j.xml

The element need to be change in that file is pattern :
if you are using log4j.properties then change corresponding element.
example of pattern element:

<PatternLayout pattern="%d [%p] %c %m%n"/>

here d id for date
p is for priority
c is for Class Name
m is fro message
n is fro separator
if you dont want any thing then remove from pattern entry.

Modified as per your requirement

<PatternLayout pattern=" %m%n"/>

answered Dec 12 '18 at 08:02

TheSprinter

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Thanks. Currently there is no log4j.xml file in the project. Shall i create one with just this one line in it - ? – Andy897 Dec 12 '18 at 08:06
yes add it in src folder & keep only `****`, before that check if the file **log4j.properties** exists – TheSprinter Dec 12 '18 at 08:09
Thanks. And how can I do this only for a given class ? instead of whole project – Andy897 Dec 12 '18 at 08:11
yes, but youe need to add 1 more appender in config and specify the package like `log4j.logger.foo.bar.pacakge.Class=DEBUG, myappender` `log4j.additivity.foo.pacakge.Class=false` – TheSprinter Dec 12 '18 at 08:21
Sorry didn't get the last comment – Andy897 Dec 12 '18 at 20:20
https://stackoverflow.com/questions/53751399/log4j-writing-downsteams-logs-to-a-file – Andy897 Dec 12 '18 at 21:10

Log4j: Log only message string without logging className and other details

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