"Log4j2 - 配置"

Question

I am trying to adopt Log4j2 in my new project, but I get my logs in catalina.out<\/code> , and the first one is always: ERROR StatusLogger Unable to locate a logging implementation, using SimpleLogger<\/code> . It seems that I have done everything according to Log4j2 docs, but still.

Answer 1

I had the same problem. After adding also log4j-core-2.0-beta3.jar to the classpath it worked.

Answer 2

In Maven you normally have this logging configuration:

<properties>    
    <slf4j-version>1.7.7</slf4j-version>
    <slf4j-log4j2-version>2.0.1</slf4j-log4j2-version>
</properties>

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${slf4j-version}</version>
</dependency>

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j-impl</artifactId>
    <version>${slf4j-log4j2-version}</version>
</dependency>

To add the log core lib you have to:

1. Add the 2.0.1 to the properties section

2. Add the log core dependency:

    <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>${log4j2-version}</version> </dependency> 

Answer 3

Updated to the version 2.7

Add the next jars to your project:

• log4j-api-2.7.jar
• log4j-core-2.7.jar

If you are using Maven, add the dependency:

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.7</version>
</dependency>

Answer 4

我使用log4j2.8.2并通过将log4j2.xml放入web classes文件夹（WEB-INF / classes / log4j2.xml）让它成功自动配置

Answer 5

If it's maven project, you have to add the below dependency,

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.17.1</version>
</dependency>
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.17.1</version>
</dependency>

And the log4j2.xml or log4j2.properties file should be under src/main/resources folder. In that case you don't need to explicitly add folder or jars in classpath. It should do the trick.