启动Spring boot项目报错：java.lang.IllegalArgumentException: LoggerFactory is not a Logback

报错如下：

java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.apache.logging.slf4j.Log4jLoggerFactory loaded from file:/D:/develop/apache-maven-3.5.3/repo/org/apache/logging/log4j/log4j-slf4j-impl/2.7/log4j-slf4j-impl-2.7.jar). If you are using WebLogic you will need to add 'org.slf4j' to prefer-application-packages in WEB-INF/weblogic.xml:

org.apache.logging.slf4j.Log4jLoggerFactory

原因：

由于springboot默认日志组件为logback，如果项目使用的为log4j，在打包到tomcat启动时报如上错误。

原因：log4j日志组件和自带logback日志组件冲突。

解决方法:

不要同时使用log4j和logback，排查log4j日志组件

        <dependency>
            <groupId>com.didi.map.traffic.eco</groupId>
            <artifactId>importer-dto</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>commons-logging</artifactId>
                    <groupId>commons-logging</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>commons-logging</artifactId>
                    <groupId>commons-logging</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>

来源：https://my.oschina.net/u/2000675/blog/3134733

标签

logback

Spring

log4j

Spring Boot