SLF4J和Log4j 2绑定Maven依赖项

Question

希望是一个简单的问题，但我的google foo让我失望了--我有一个maven项目，我们在其中使用了SLF4J和Log4J1.2绑定。

我们现在想要转移到Log4J2，特别是为了提高性能--但是，我一辈子都找不到Log4J2.0绑定的maven依赖项。我在http://logging.apache.org/log4j/2.x/log4j-SLF4j-impl/上找到了一些注释，但没有提到任何依赖关系信息。

在下面的第一个答案后面编辑添加一些代码，我得到了异常：

线程“main”java.lang.nosuchmethoderror出现异常：org/apache/logging/log4j/spi/abstractloggerwrapper。(lorg/apache/logging/log4j/spi/abstractlogger；ljava/lang/string；）V在org.slf4j.impl.slf4jlogger。(slf4jlogger.java:48)

POM：

<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>logging.test</groupId>
<artifactId>logtest2</artifactId>
<version>0.0.1</version>
<name>logtest2</name>
<description>logtest2</description>
<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
    </plugins>
</build>
<dependencies>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.5</version>
    </dependency>

    <dependency>
        <groupId>org.apache.logging.log4j.adapters</groupId>
        <artifactId>log4j-slf4j-impl</artifactId>
        <version>2.0-beta3</version>
    </dependency>

    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.0-beta9</version>
    </dependency>

    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.0-beta9</version>
    </dependency>
</dependencies>

我的log4j.xml:

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="A1" class="org.apache.log4j.FileAppender">
        <param name="File" value="c:/logtest2.0/log.txt" />
        <param name="Append" value="false" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p %X{sessionId} %c MSG: %m%n" />
        </layout>
    </appender>
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %p %X{sessionId} %c MSG: %m%n" />
        </layout>
    </appender>
    <category name="org.apache.log4j.xml">
        <priority value="debug" />
        <appender-ref ref="A1" />
    </category>
    <root>
        <priority value="debug" />
        <appender-ref ref="STDOUT" />
    </Root> </log4j:configuration>

和我的测试java类：

package loggertest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LoggerTest {

    public static final Logger LOGGER = LoggerFactory.getLogger(LoggerTest.class);

    public static void main(final String[] p_args) throws InterruptedException {
        LOGGER.debug("Logger test");
    }
}

Answer 1

"org.apache.logging.log4j:log4j-slf4j-impl:2.0-beta9" - 
            LOG4J implementation of SLF4J API
"org.apache.logging.log4j:log4j-core:2.0-beta9" - Core LOG4J implementation

这一点，加上类路径上的一个有效log4j2.xml，您就应该开始了。