Java 通过 JVM 参数进行 log4j 配置？
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log4j configuration via JVM argument(s)?
提问by jconlin
What variables do I have to set/pass as arguments to the JVM to get log4j to run properly? And by properly I mean not complain and print to the console. Can I see a typical example?
我必须设置/传递哪些变量作为 JVM 的参数才能使 log4j 正常运行？正确的意思是不要抱怨并打印到控制台。我可以看一个典型的例子吗？
Note: I need to avoid creating a log4j.properties file in the application.
注意：我需要避免在应用程序中创建 log4j.properties 文件。
采纳答案by Brian Agnew
Do you have a log4j configuration file ? Just reference it using
你有 log4j 配置文件吗？只需使用引用它
-Dlog4j.configuration={path to file}
where {path to file} should be prefixed with file:
其中 {path to file} 应该以 file:
Edit:If you are working with log4j2, you need to use
编辑：如果您使用的是 log4j2，则需要使用
-Dlog4j.configurationFile={path to file}
Taken from answer https://stackoverflow.com/a/34001970/552525
回答by Natalia
Generally, as long as your log4j.properties file is on the classpath, Log4j should just automatically pick it up at JVM startup.
通常，只要您的 log4j.properties 文件在类路径上，Log4j 就会在 JVM 启动时自动获取它。
回答by Tim Büthe
I know this is already answered, but because you said, this isn't exactly what you are looking for, I would like to point out the following alternative:
我知道这已经得到了回答，但因为你说，这不是你正在寻找的，我想指出以下替代方案：
You can also use a configuration class instead of the properties or xml file.
您还可以使用配置类而不是属性或 xml 文件。
-Dlog4j.configuratorClass=com.foo.BarConfigurator
See http://logging.apache.org/log4j/1.2/manual.htmlfor details.
回答by 30thh
The solution is using of the following JVM argument:
解决方案是使用以下 JVM 参数：
-Dlog4j.configuration={path to file}
If the file is NOT in the classpath (in WEB-INF/classesin case of Tomcat) but somewhere on you disk, use file:, like
如果文件不在类路径中（在WEB-INF/classesTomcat 的情况下）而是在磁盘上的某个位置，请使用file:，例如
-Dlog4j.configuration=file:C:\Users\me\log4j.xml
More information and examples here: http://logging.apache.org/log4j/1.2/manual.html
回答by D. L.
This seems to have changed (probably with log4j2) to:
这似乎已更改（可能与 log4j2）为：
-Dlog4j.configurationFile=file:C:\Users\me\log4j.xml
See: https://logging.apache.org/log4j/2.x/manual/configuration.html
请参阅：https: //logging.apache.org/log4j/2.x/manual/configuration.html
回答by Vineet Menon
Late to the party as since 2015, Log4J 1.x has reached EOL.
自 2015 年以来晚会，Log4J 1.x 已达到EOL。
Log4J 2.x onwards the JVM optionshould be -Dlog4j.configurationFile=<filename>
Log4J 2.x 之后的JVM 选项应该是-Dlog4j.configurationFile=<filename>
P.S. <filename>could be a file relative to the class path withoutthe file:as suggested in the other answers.
PS<filename>可能是相对于类路径的文件，而不该file:在其他答案建议。
回答by ridox
Relative Path is also ok:
相对路径也可以：
java -Dlog4j.configuration=file:".\log4j.properties" -jar com.your-1.0-SNAPSHOT.jar
or
或者
java -Dlog4j.configuration=file:".\log4j.xml" -jar com.your-1.0-SNAPSHOT.jar
回答by emanuel07
If you are using gradle. You can apply 'aplication' plugin and use the following command
如果您使用的是 gradle。您可以应用“应用程序”插件并使用以下命令
applicationDefaultJvmArgs = [
"-Dlog4j.configurationFile=your.xml",
]
