Should log4.properties be on the classpath?

Question

I'm having some problems putting my log4j.properties file on classpath. I can use it when I'm developing (Eclipse Indigo) but, when I export my app as a JAR, I can't.

I've made by hand a MANIFEST.MF file for the exported JAR:

Manifest-Version: 1.0
Main-Class: main.Program
Class-Path: lib/log4j.properties lib/log4j-1.2.15.jar

And then with put the JAR on this file organization:

folder
  |-------- app.jar
  |-------- lib
             |--------- log4j.properties
             |--------- log4j-1.2.15.jar

When I try to run app.jar, they find log4j.jar but not log4j.properties:

log4j:WARN No appenders could be found for logger (main.Program).
log4j:WARN Please initialize the log4j system properly.

My log4j.properties file it's like this:

log4j.rootLogger=INFO, stdout, file

PATTERN=[%d] [%p] [%c{1}]: %m%n

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=${PATTERN}

log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern='.'yyyy-MM-dd
log4j.appender.file.File=${logger_file_path}
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=${PATTERN}

score 18 · Answer 1 · answered Nov 22 '13 at 09:20

18

one more way to do this: -Dlog4j.configuration=file:"./log4j.properties"

answered Nov 22 '13 at 09:20

petertc

3,607
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2

For log4j version 2 use: -Dlog4j.configurationFile=file:"YourPathHERE/log4j2.xml" – NullPumpkinException Apr 28 '17 at 01:53

score 12 · Answer 2 · edited Apr 01 '13 at 22:55

12

There are three ways l know.

Add log4j.properties to app.jar
Put the log4j.properties to the "folder" (where the JAR exists) and change the class-path to .lib/log4j-1.2.15.jar.
Put the log4j.properties to the folder named "conf" for example, and change the class-path to ./conf/.

I have tried, it works.

edited Apr 01 '13 at 22:55

Tom Kerr

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answered Oct 25 '12 at 06:41

钮玉晓

133
1
6

3

Thank you very much. My English is very poor! – 钮玉晓 Oct 29 '12 at 01:16

score 11 · Accepted Answer · answered Jan 17 '12 at 15:53

11

Do not put the log4j.properties itself in the classpath, but the directory that contains that file.

Class-Path: lib lib/log4j-1.2.15.jar

answered Jan 17 '12 at 15:53

Jesper

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350

I've already corrected changing the log4j.properties into the "folder" (where the JAR exists) and change the class-path to ". lib/log4j-1.2.15.jar". Before that I've tried several folder path to "lib" (e.g. /lib/, lib/, ./lib/) and none of them worked. – rnunes Jan 17 '12 at 16:11
An old thread, but just want to add that this approach really works. Another good thing about this approach is that a user can actually change the log level if they want to because the config file is outside any jar. – arunskrish Sep 23 '14 at 11:16

score 1 · Answer 4 · answered Jan 17 '12 at 16:09

1

Add log4j.properties to app.jar.

answered Jan 17 '12 at 16:09

rodrigoap

7,405
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46

For now I prefer to have it externally – rnunes Jan 17 '12 at 16:14

score 0 · Answer 5 · answered Feb 24 '16 at 07:43

0

I tried the answer of Jesper, and at first it didn't work. Then I tried with

Class-Path: lib/ lib/log4j-1.2.15.jar

And it worked after that.

answered Feb 24 '16 at 07:43

emi-le

756
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score -1 · Answer 6 · answered Feb 23 '15 at 18:38

-1

try to execute:

javar -jar -Dlog4j.configuration=file:"./log4j.properties" app.jar

answered Feb 23 '15 at 18:38

gonella

186
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6

Should log4.properties be on the classpath?

6 Answers6

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