Sbt版:

添加排除(“org。Slf4j "， " Slf4j -log4j12")传递到包含Slf4j -log4j12的依赖项。例如，当使用Log4j 2.6使用Spark时:

libraryDependencies ++= Seq(
  // One SLF4J implementation (log4j-slf4j-impl) is here:
  "org.apache.logging.log4j" % "log4j-api" % "2.6.1",
  "org.apache.logging.log4j" % "log4j-core" % "2.6.1",
  "org.apache.logging.log4j" % "log4j-slf4j-impl" % "2.6.1",
  // The other implementation (slf4j-log4j12) would be transitively
  // included by Spark. Prevent that with exclude().
  "org.apache.spark" %% "spark-core" % "1.5.1" exclude("org.slf4j", "slf4j-log4j12")
)

只使用所需的依赖项，而不是全部:)))。对于我来说，对于正常的日志记录过程，您需要这个依赖项来排除pom.xml中的其他依赖项

<dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.5</version>
    </dependency>

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.1.8</version>
    </dependency>

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.1.8</version>
    </dependency>

这个问题是因为StaticLoggerBinder.class属于两个不同的jar。这个类引用自logback-classic-1.2.3.jar，同样的类也引用自log4j-slf4j- pil -2.10.0.jar。两个jar都在类路径中。因此他们之间产生了冲突。 这是log4j2.xml文件在类路径[src/main/resource]下没有生成日志文件的原因。

我们已经选择了一个jar，我建议使用log4j-slf4j- pple -2.10.0.jar文件，排除logback-classic-1.2.3.jar文件。 解决方法:打开pom文件，查看依赖层次结构[eclipse]或运行 MVN dependency:tree命令用于查找下载依赖的依赖树和依赖源。找到冲突的依赖项并排除它们。对于Springboot应用程序，请尝试这样做。

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-logging</artifactId>
                    </exclusion>
                </exclusions>
        </dependency>
    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

This is working fine for me after struggling a lots.

Sbt版:

添加排除(“org。Slf4j "， " Slf4j -log4j12")传递到包含Slf4j -log4j12的依赖项。例如，当使用Log4j 2.6使用Spark时:

libraryDependencies ++= Seq(
  // One SLF4J implementation (log4j-slf4j-impl) is here:
  "org.apache.logging.log4j" % "log4j-api" % "2.6.1",
  "org.apache.logging.log4j" % "log4j-core" % "2.6.1",
  "org.apache.logging.log4j" % "log4j-slf4j-impl" % "2.6.1",
  // The other implementation (slf4j-log4j12) would be transitively
  // included by Spark. Prevent that with exclude().
  "org.apache.spark" %% "spark-core" % "1.5.1" exclude("org.slf4j", "slf4j-log4j12")
)

我也有同样的问题。在我的pom.xml中，两者都有

 <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.28</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>2.2.1.RELEASE</version>
    </dependency>

当我删除spring-boot-starter-web依赖时，问题就解决了。

<!--<dependency>-->
     <!--<groupId>org.springframework.boot</groupId>-->
     <!--<artifactId>spring-boot-starter-log4j2</artifactId>-->
<!--</dependency>-->

我通过删除这个来解决:spring-boot-starter-log4j2