blocks|key|672543|text|好的，我通过改变这个来让它工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672544|log4j.rootLogger=DebugAppender|code-block|syntax|javascript|672545|到这个|672546|log4j.rootLogger=DEBUG,+DebugAppender|672547|显然，您必须首先指定rootLogger的日志记录级别？如果我浪费了大家的时间我深表歉意。|offset|length|style|CODE|672548|另外，我决定回答我自己的问题，因为这不是类路径问题。|672549|entityMap^0|0|0|0|0|A|A|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Alright, so I got it working by changing this

<pre><code>log4j.rootLogger=DebugAppender
</code></pre>

to this

<pre><code>log4j.rootLogger=DEBUG, DebugAppender
</code></pre>

Apparently you have to specify the logging level to the <code>rootLogger</code> first? I apologize if I wasted anyone's time.

Also, I decided to answer my own question because this wasn't a classpath issue.

blocks|key|672593|text|尝试在main中执行类似以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672594|public+static+void+main(String[]+args)+{
+++++PropertyConfigurator.configure(args[0]);
++++//...+your+code|code-block|syntax|javascript|672595|您需要告诉log4j它的配置应该是什么。|672596|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try doing something like the following in main:

<pre><code>public static void main(String[] args) {
 PropertyConfigurator.configure(args[0]);
 //... your code
</code></pre>

you need to tell log4j what its configuration should be.

blocks|key|672629|text|我的工作是创建一个log4j属性文件(您可以在网上找到许多示例)，并将其放置在项目目录中的属性文件夹中(如果不是词典，则创建此文件夹)。右键单击文件夹和Build+Path->Use+as+Source+Folder。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|672630|希望它能帮上忙！|672631|entityMap^0|24|W|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

What worked for me is to create a log4j properties file (you can find many examples over the net) and place it in properties folder in your project directory (create this folder if not exicts). The right click on the folder and <code>Build Path-&gt;Use as Source Folder</code>. 

Hope it helps!

blocks|key|672666|text|如果在运行使用log4j的程序时遇到错误/警告，解决方案是添加一个类加载器可以看到的log4j.properties。通常它位于Java项目的"src“文件夹中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672667|log4j.rootLogger=INFO,+stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%25d{ABSOLUTE}+%255p+%25c{1}:%25L+-+%25m%25n|code-block|syntax|javascript|672668|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are encountering the error/warning when you're running a program that uses log4j, the solution is to add a log4j.properties that can be seen by the class loader. Normally it's in the "src" folder of your Java project:
Add the following contents to the file

<pre><code>log4j.rootLogger=INFO, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
</code></pre>

blocks|key|672687|text|我的修复方法是将"log4j.properties“放到"src”文件夹中。它在我的包文件夹中不起作用，它必须位于源代码的最底层。将其添加到构建路径，然后将其移动到“参考库”也不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672688|重复一遍:将log4j.properties放在src文件夹的根目录下。|672689|我的log4j.properties文件包含以下内容，这些内容适用于基于Eclipse的最新版本的Spring+Tool+Suite。|672690|#+Configure+logging+for+testing:+optionally+with+log+file
#log4j.rootLogger=INFO,+stdout
log4j.rootLogger=WARN,+stdout,+logfile

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%25d+%25p+[%25c]+-+%25m%25n

log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%25d+%25p+[%25c]+-+%25m%25|code-block|syntax|javascript|672691|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The fix for me was to put "log4j.properties" into the "src" folder. It did not work in my package folder it has to be one up at the very root of source. Adding it to the build path which then moves it to the "Reference Libraries" also did not work. 

To repeat: put log4j.properties at the root of your src folder.

my log4j.properties files has the following content which works on the latest version of Spring Tool Suite which is based on Eclipse.

<pre><code># Configure logging for testing: optionally with log file
#log4j.rootLogger=INFO, stdout
log4j.rootLogger=WARN, stdout, logfile

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%
</code></pre>

blocks|key|672726|text|要添加到@Gevorg，如果您在本地运行Spark也有类似的情况，请将log4j.properties文件放在主文件夹下名为resources的文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672727|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

To add to @Gevorg, if you have a similar situation running Spark locally, place the log4j.properties file in the folder named resources under the main folder.

blocks|key|672735|text|只需在main方法的开头配置您的log4j属性文件路径:例如:+PropertyConfigurator.configure("D:\files\log4j.properties")；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672736|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

just configure your log4j property file path in beginning of main method: e.g.: PropertyConfigurator.configure("D:\files\log4j.properties");

blocks|key|672756|text|这对我来说很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|672757|public+static+void+main(String[]+args)+{

++++++++Properties+props+=+new+Properties();
++++++++props.load(new+FileInputStream("src/log4j.properties"));
++++++++PropertyConfigurator.configure(props);|code-block|syntax|javascript|672758|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This work for me:

<pre><code>public static void main(String[] args) {

 Properties props = new Properties();
 props.load(new FileInputStream("src/log4j.properties"));
 PropertyConfigurator.configure(props);
</code></pre>

Here is the error message -

<pre><code>log4j:WARN No appenders could be found for logger (SerialPortUtil).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
</code></pre>

Here is the invocation in the <code>SerialPortUtil</code> class -

<pre><code>private static final Logger log = Logger.getLogger(SerialPortUtil.class.getSimpleName());
.
.
.
log.info("Serial port " + port.getName() + " is available");
</code></pre>

Here is the content of my log4j.properties file -

<pre><code>log4j.rootLogger=DebugAppender

#Debug logging
log4j.appender.DebugAppender=org.apache.log4j.RollingFileAppender
log4j.appender.DebugAppender.Threshold=DEBUG
log4j.appender.DebugAppender.File=activityLog.log
log4j.appender.DebugAppender.MaxFileSize=200KB
log4j.appender.DebugAppender.MaxBackupIndex=5
log4j.appender.DebugAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.DebugAppender.layout.ConversionPattern=%d{DATE} %t - %m%n
</code></pre>

And the property file is on the classpath.

Everything looks right to me, so what's going on? Shouldn't the <code>DEBUG</code> threshold also capture <code>INFO</code> logging?

Please initialize the log4j system properly warning

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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以下是错误消息-log4j:WARN No appenders could be found for logger (SerialPortUtil).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging....

问请正确初始化log4j系统警告
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