简单java maven项目中的log4j
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log4j in simple java maven project
提问by riship89
I have simple java project. I manage my dependancies using maven. I added log4j dependency in my pom.xml
我有一个简单的java项目。我使用 maven 管理我的依赖项。我在 pom.xml 中添加了 log4j 依赖项
Now I want to make use of
现在我想利用
package com.abc.xyz;
import org.apache.log4j.Logger;
/**
* Hello world!
*
*/
public class App
{
static final Logger logger = Logger.getLogger(App.class);
public static void main( String[] args )
{
logger.debug("Hello world!");
}
}
I have my log4j.properties file in resources folder.
我在资源文件夹中有我的 log4j.properties 文件。
When I run App as a Java application I get following error.
当我将 App 作为 Java 应用程序运行时，出现以下错误。
log4j:WARN No appenders could be found for logger (com.abc.xyz.App).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
So, my question is how to make runtime know that my log4j.properties file is in resources folder.
所以，我的问题是如何让运行时知道我的 log4j.properties 文件在资源文件夹中。
EDIT
编辑
Here is my pom.xml
这是我的 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.abc.xyz</groupId>
<artifactId>learning</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>learning</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
and here is my log4j.properties file
这是我的 log4j.properties 文件
# Define the root logger with appender file
log4j.rootLogger = DEBUG
采纳答案by riship89
I modified my App class as follows:
我修改了我的 App 类如下：
public class App
{
static final Logger logger = Logger.getLogger(App.class);
public static void main( String[] args )
{
PropertyConfigurator.configure("/absolute/path/to/log4j.properties");
logger.debug("Hello world!");
}
}
回答by Satya
change your pom.xml dependency for log4j to this:
将 log4j 的 pom.xml 依赖项更改为：
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.0-beta9</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.0-beta9</version>
</dependency>
</dependencies>
and see if it works
看看它是否有效
回答by Hilikus
Set the system property log4j.configurationto the runtime path of the file. This can be done in the application launcher. Something like this, assuming your configuration file is in the root of your working directory (since you said your file is in src/main/resourcesmaven will move it to the root)
将系统属性设置log4j.configuration为文件的运行时路径。这可以在应用程序启动器中完成。像这样，假设您的配置文件在您的工作目录的根目录中（因为您说您的文件在src/main/resources 中，maven 会将其移动到根目录）
-Dlog4j.configuration=log4j.properties
But i have to say, if your file is really called log4j.properties and it really is in src/main/resourcesyou should not need this since log4j will look for it there by default
但我不得不说，如果你的文件真的被称为 log4j.properties 并且它真的在src/main/resources 中，你不应该需要它，因为默认情况下 log4j 会在那里寻找它
回答by Sam
You should place log4j.properties under src/main/resourcesfolder of your projects to avoid the warning or provide the file path using -Dlog4j.configuration=<FILE_PATH>
您应该将 log4j.properties 放在src/main/resources项目文件夹下以避免警告或使用提供文件路径-Dlog4j.configuration=<FILE_PATH>
