Java commons-logging 和 log4j 属性文件
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commons-logging and log4j properties file
提问by yasha
I am trying to use log4j via commons-logging and having problems if the log4j properties file is not called log4.properties. I get following error: log4j:WARN No appenders could be found for logger (LogMePlease). log4j:WARN Please initialize the log4j system properly.
我正在尝试通过 commons-logging 使用 log4j，如果 log4j 属性文件未被称为 log4.properties，则会出现问题。我收到以下错误：log4j:WARN 找不到记录器的附加程序 (LogMePlease)。log4j:WARN 请正确初始化 log4j 系统。
My code is very simple:
我的代码很简单：
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class LogMePlease
{
static Log l = LogFactory.getLog(LogMePlease.class);
public static void main(String [] args)
{
l.warn("Hello World!");
}
}
In my class path, i have: commons-logging.propertiesfile which contains following entries
在我的类路径中，我有： commons-logging.properties文件，其中包含以下条目
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
log4j.configuration=log4j-test.properties
and log4j-test.propertiesfile
和 log4j-test.properties文件
when i run this code i get
当我运行此代码时，我得到
log4j:WARN No appenders could be found for logger (LogMePlease).
log4j:WARN Please initialize the log4j system properly.
If I rename log4j-test.properties file to be log4j.properties - then everything works. So, the question is how can I setup commons logging to use arbitrary name for log4j.properties file.
如果我将 log4j-test.properties 文件重命名为 log4j.properties - 那么一切正常。因此，问题是如何设置公共日志记录以对 log4j.properties 文件使用任意名称。
回答by Aaron Digulla
The file commons-logging.propertiesis only read from commons logging while log4j will look for log4j.configurationin the system properties.
该文件commons-logging.properties仅从公共日志中读取，而 log4j 将log4j.configuration在系统属性中查找。
So you must either specify them with -Dlog4j.configuration=log4j-test.propertieson the command line as a JVM option or you must call System.setProperty()before the first call to any logging method (which is usually pretty hard to achieve).
因此，您必须-Dlog4j.configuration=log4j-test.properties在命令行上将它们指定为 JVM 选项，或者必须System.setProperty()在第一次调用任何日志记录方法之前调用（这通常很难实现）。
Note: If you can, use the XML config log4j.xml; it's much more simple and powerful for configuring log4j.
注意：如果可以，请使用 XML 配置log4j.xml；配置 log4j 更加简单和强大。
回答by aerobiotic
You need to add the protocol to the front of System property value like so: -Dlog4j.configuration=file://log4j-test.properties
您需要将协议添加到系统属性值的前面，如下所示：-Dlog4j.configuration=file://log4j-test.properties
Without the protocol it will look in the classpath.
如果没有协议，它将在类路径中查找。
回答by zg_spring
jul - commons-logging, it likes your situation.
jul - commons-logging，它喜欢你的情况。
org.apache.commons.logging.LogFactory=org.apache.commons.logging.impl.LogFactoryImpl
#org.apache.commons.logging.Log=org.apache.commons.logging.impl.Jdk14Logger
#org.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
set log4j.properties, before instance of Log.
在 Log 实例之前设置 log4j.properties。
System.setProperty("log4j.configuration", "log4j.properties");
