在运行时设置 java.util.logging.config.file
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Setting java.util.logging.config.file at runtime
提问by radlan
I am trying to set the java util logging config file at runtime to avoid having to set it as a VM parameter. But this just doesn't work. Whenever I am trying to reread the configuration, logging is disabled at all.
我试图在运行时设置 java util 日志配置文件，以避免将其设置为 VM 参数。但这根本行不通。每当我尝试重新读取配置时，日志记录都被禁用。
See the following code snippet:
请参阅以下代码片段：
package test;
import java.io.FileInputStream;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;
public class A {
private static final Logger LOGGER= Logger.getLogger(A.class.getName());
public static void main(String[] args) throws Exception {
System.out.println("--- start");
LOGGER.log(Level.SEVERE, "SEVERE 1");
LOGGER.log(Level.FINEST, "FINEST 1");
LogManager.getLogManager().readConfiguration();
LOGGER.log(Level.SEVERE, "SEVERE 2");
LOGGER.log(Level.FINEST, "FINEST 2");
LogManager.getLogManager().readConfiguration(new FileInputStream("/tmp/logging.properties"));
LOGGER.log(Level.SEVERE, "SEVERE 3");
LOGGER.log(Level.FINEST, "FINEST 3");
System.out.println("--- end");
}
}
This is the output if I run the class without any VM argument:
如果我在没有任何 VM 参数的情况下运行该类，则这是输出：
--- start
09.11.2012 09:59:25 test.A main
SCHWERWIEGEND: SEVERE 1
09.11.2012 09:59:25 test.A main
SCHWERWIEGEND: SEVERE 2
--- end
As you can see, only the SEVERE levels are logged, as this is the default of the JREs logging.properties. Calling LogManager#readConfiguration()doesn't change anything. But when trying to read the configuration from my logging.properties, absolutely nothing is logged. There is no difference in calling LogManager#readConfiguration(InputStream)or setting the java.util.logging.config.fileproperty and calling LogManager#readConfiguration().
如您所见，只记录了 SEVERE 级别，因为这是 JRE 的 logging.properties 的默认值。打电话LogManager#readConfiguration()改变不了任何事情。但是当试图从我的 logging.properties 读取配置时，绝对没有记录任何内容。调用LogManager#readConfiguration(InputStream)或设置java.util.logging.config.file属性与调用LogManager#readConfiguration().
Now see the next output, when I run the same code with the VM property -Djava.util.logging.config.file=/tmp/logging.properties:
现在查看下一个输出，当我使用 VM 属性运行相同的代码时-Djava.util.logging.config.file=/tmp/logging.properties：
--- start
2012-11-09 10:03:44.0838 SEVERE [test.A#main()] - SEVERE 1
2012-11-09 10:03:44.0843 FINEST [test.A#main()] - FINEST 1
--- end
As you can see, both the SEVERE and the FINEST levels are logged and they are logged in a different format. Both is specified in my custom logging.properties.
But logging stops here after calling LogManager#readConfiguration()! This is different from the example above and I don't understand it. Also, just as in the example above, calling LogManager#readConfiguration(InputStream)doesn't work.
如您所见，SEVERE 和 FINEST 级别都被记录，并且它们以不同的格式记录。两者都在我的 custom 中指定logging.properties。但是在调用后记录停止在这里LogManager#readConfiguration()！这与上面的示例不同，我不明白。此外，就像上面的例子一样，调用LogManager#readConfiguration(InputStream)不起作用。
So what is the problem? According to the javadocsetting the java.util.logging.config.file property at runtime should work. Also both readConfiguration() methods should work as I expect. So what is the problem?
那么问题出在哪里呢？根据javadoc设置，运行时的 java.util.logging.config.file 属性应该可以工作。此外，两个 readConfiguration() 方法都应该按我的预期工作。那么问题出在哪里呢？
采纳答案by Udo Klimaschewski
Probably a problem with your logging properties. I noticed that I had to use both level specifications in the config (root and console) to get the result.
Maybe your root logger level is below FINEST, e.g. INFO(.level=INFO).
Or not set at all, in which case I suppose it to be INFO.
可能是您的日志记录属性有问题。我注意到我必须在配置（根和控制台）中使用两个级别规范才能获得结果。
也许您的根记录器级别低于FINEST，例如INFO( .level=INFO)。
或者根本没有设置，在这种情况下，我认为它是INFO.
I ran your code with the following logging.properties:
我使用以下 logging.properties 运行您的代码：
handlers=java.util.logging.ConsoleHandler
.level=FINEST
java.util.logging.ConsoleHandler.level=FINEST
Without specifying the -Djava.util.logging.config.file=/tmp/logging.propertiesoutput was:
没有指定-Djava.util.logging.config.file=/tmp/logging.properties输出是：
--- start
09.11.2012 14:25:49 testing.Scribble main
SCHWERWIEGEND: SEVERE 1
09.11.2012 14:25:49 testing.Scribble main
SCHWERWIEGEND: SEVERE 2
09.11.2012 14:25:49 testing.Scribble main
SCHWERWIEGEND: SEVERE 3
09.11.2012 14:25:49 testing.Scribble main
AM FEINSTEN: FINEST 3
--- end
Looks correct! (My test class is called testing.Scribble, thats the only difference)
看起来正确！（我的测试类叫做 testing.Scribble，这是唯一的区别）
Using -Djava.util.logging.config.file=/tmp/logging.propertiesoutput is:
使用-Djava.util.logging.config.file=/tmp/logging.properties输出是：
--- start
09.11.2012 14:31:06 testing.Scribble main
SCHWERWIEGEND: SEVERE 1
09.11.2012 14:31:06 testing.Scribble main
AM FEINSTEN: FINEST 1
09.11.2012 14:31:06 testing.Scribble main
SCHWERWIEGEND: SEVERE 2
09.11.2012 14:31:06 testing.Scribble main
AM FEINSTEN: FINEST 2
09.11.2012 14:31:06 testing.Scribble main
SCHWERWIEGEND: SEVERE 3
09.11.2012 14:31:06 testing.Scribble main
AM FEINSTEN: FINEST 3
--- end
Looks also correct!
看起来也没错！
