Log4j : How to create default values in properties file

Question

I have the following file appender

log4j.appender.file.File=${myFileLoc}/log/mylog.log

However, I want to make sure it still functions properly if someone forgets to set the system property. Is there a way to specify a default value in the properties file?

I do not want to change the log4j.xml in any way. I just want to change the log4j properties file or if possible, make some code change to reflect what i need.

For example, if possible, i can check for the system property in the code and if it is not set, then pass the default value to the logger. Is that feasible?

I'm just trying to clearly understand this questions. Are you using both xml file and properties file ? — Rajind Ruparathna, Dec 04 '16 at 02:49
i dont have access to the log4j xml file. i can only work with the log4j.properties file — AbtPst, Dec 04 '16 at 17:48

score 0 · Answer 1 · edited May 23 '17 at 12:08

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I think you can define it like this in properties file. See here.

property.myFileLoc = target/rolling/rollingtest.log

For property substitution in xml file see here. Also please refer to this answer.

edited May 23 '17 at 12:08

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answered Dec 04 '16 at 02:57

Rajind Ruparathna

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thanks, so does this go in log4j.properties? also how do i check and replace? – AbtPst Dec 04 '16 at 17:48
I haven't tried this. Please see the docs that I have linked. – Rajind Ruparathna Dec 04 '16 at 17:51

Log4j : How to create default values in properties file

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