【idea】log4j和slf4j配合使用问题（2024-9-23最新版本）！

1、slf4j

        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>${slf4j.version}</version>
<!--            <scope>test</scope>-->
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>

 

2、log4j

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j2-impl</artifactId>
            <version>${log4j.version}</version>
<!--            <scope>test</scope>-->
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>${log4j.version}</version>
        </dependency>

3、以前只需要配置上述依赖就行

Logger logger = LoggerFactory.getLogger(CommonServiceImpl.class);

4、使用最新版本后报错

        <slf4j.version>2.0.16</slf4j.version>
        <log4j.version>2.24.0</log4j.version>

ERROR Unable to create Lookup for ctx java.lang.NoSuchMethodError: 'java.util.stream.Stream org.apache.logging.log4j.util.ServiceLoaderUtil.safeStream(java.lang.Class, java.util.ServiceLoader, org.apache.logging.log4j.Logger)'

看报错基本都是启动服务时，内部调用报的错，去maven上看了下依赖，明确表明都是依赖log4j-api，把依赖加上就行

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>${log4j.version}</version>
        </dependency>

 

log4j-slf4j2-impl的：

 

 log4j-core的：

 

注：

log4j-slf4j2-impl和log4j-slf4j-impl无明显区别，只是支持log4j的日志框架不用，2是2.x版本，无后缀是1.x版本。（查询自百度AI）