log4.properties 应该在类路径上吗？
我在将 log4j.properties 文件放在类路径上时遇到一些问题。我在开发 (Eclipse Indigo) 时可以使用它，但是当我将应用程序导出为 JAR 时，我不能使用它。
我为导出的 JAR 手工制作了 MANIFEST.MF 文件：
Manifest-Version: 1.0
Main-Class: main.Program
Class-Path: lib/log4j.properties lib/log4j-1.2.15.jar
然后将 JAR 放在此文件组织中：
folder
|-------- app.jar
|-------- lib
|--------- log4j.properties
|--------- log4j-1.2.15.jar
当我尝试运行 app.jar 时，它们找到 log4j.jar 但找不到 log4j.properties：
log4j:WARN No appenders could be found for logger (main.Program).
log4j:WARN Please initialize the log4j system properly.
我的 log4j.properties 文件是这样的：
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=${PATTERN}
I'm having some problems putting my log4j.properties file on classpath. I can use it when I'm developing (Eclipse Indigo) but, when I export my app as a JAR, I can't.
I've made by hand a MANIFEST.MF file for the exported JAR:
Manifest-Version: 1.0
Main-Class: main.Program
Class-Path: lib/log4j.properties lib/log4j-1.2.15.jar
And then with put the JAR on this file organization:
folder
|-------- app.jar
|-------- lib
|--------- log4j.properties
|--------- log4j-1.2.15.jar
When I try to run app.jar, they find log4j.jar but not log4j.properties:
log4j:WARN No appenders could be found for logger (main.Program).
log4j:WARN Please initialize the log4j system properly.
My log4j.properties file it's like this:
log4j.rootLogger=INFO, stdout, file
PATTERN=[%d] [%p] [%c{1}]: %m%n
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=${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}
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另一种方法可以做到这一点：
-Dlog4j.configuration=文件：“./log4j.properties”one more way to do this:
-Dlog4j.configuration=file:"./log4j.properties"我知道的有三种方法
log4j.properties添加到app.jarlog4j.properties放入“文件夹”（JAR 所在的位置）并更改类 -.lib/log4j-1.2.15.jar的路径。log4j.properties放入名为“conf”的文件夹，并将类路径更改为./conf/。我试过了，有效。
There are three ways l know.
log4j.propertiestoapp.jarlog4j.propertiesto the "folder" (where the JAR exists) and change the class-path to.lib/log4j-1.2.15.jar.log4j.propertiesto the folder named "conf" for example, and change the class-path to./conf/.I have tried, it works.
不要将 log4j.properties 本身放在类路径中，而应将其放在包含该文件的目录中。
Do not put the
log4j.propertiesitself in the classpath, but the directory that contains that file.将
log4j.properties添加到app.jar。Add
log4j.propertiestoapp.jar.我尝试了Jesper的答案，一开始不起作用。然后我尝试了一下
，之后就成功了。
I tried the answer of Jesper, and at first it didn't work. Then I tried with
And it worked after that.
尝试执行：
javar -jar -Dlog4j.configuration=file:"./log4j.properties" app.jar
try to execute:
javar -jar -Dlog4j.configuration=file:"./log4j.properties" app.jar