1. 从 GitHub 网站，git clone kafka 源码

2. 下载安装好 gradle，scala

2.1 从 dependencies.gradle 文件中找到 gradle 的版本，然后下载指定版本，并配置好 GRADLE_HOME 环境变量

3. 进入 kafka 项目目录，依次执行 gradle wrapper，gradle idea，gradle build --exclude-task test

4. 将工程导入到 idea

　　4.1 启动主类 kafka.Kafka

　　4.2 program arguments：config/server.properties

　　4.3 把 config 目录下的 log4j.properties 拷贝到 core/src/main/resources 目录

　　4.4 File -> Project Structure -> Modules

5. 启动程序

然而，大部分情况下，日志不会打印出来，配置一下 core 模块的 log4j 依赖

找到 build.gradle 文件中的 project(":core")，修改对应的 log4j 依赖，然后重新执行 gradle idea，重新导入 idea 中

project(":core") {
  println "Building project "core" with Scala version ${versions.scala}"

  apply plugin: "scala"
  
  // scaladoc generation is configured at the sub-module level with an artifacts
  // block (cf. see streams-scala). If scaladoc generation is invoked explicitly
  // for the `core` module, this ensures the generated jar doesn"t include scaladoc
  // files since the `core` module doesn"t include public APIs.
  scaladoc {
    enabled = false
  }
  if (userEnableTestCoverage)
    apply plugin: "org.scoverage"
  archivesBaseName = "kafka_${versions.baseScala}"

  dependencies {
    compile project(":clients")
    compile project(":metadata")
    compile project(":raft")
    compile libs.argparse4j
    compile libs.jacksonDatabind
    compile libs.jacksonModuleScala
    compile libs.jacksonDataformatCsv
    compile libs.jacksonJDK8Datatypes
    compile libs.joptSimple
    compile libs.metrics
    compile libs.scalaCollectionCompat
    compile libs.scalaJava8Compat
    compile libs.scalaLibrary
    // only needed transitively, but set it explicitly to ensure it has the same version as scala-library
    compile libs.scalaReflect
    compile libs.scalaLogging
    compile libs.slf4jApi
    compile libs.slf4jlog4j
    compile libs.log4j

    compile(libs.zookeeper) {
//      exclude module: "slf4j-log4j12"
//      exclude module: "log4j"
    }
    // ZooKeeperMain depends on commons-cli but declares the dependency as `provided`
    compile libs.commonsCli

    compileOnly libs.log4j

    testCompile project(":clients").sourceSets.test.output
    testCompile libs.bcpkix
    testCompile libs.mockitoCore
    testCompile libs.easymock
    testCompile(libs.apacheda) {
      exclude group: "xml-apis", module: "xml-apis"
      // `mina-core` is a transitive dependency for `apacheds` and `apacheda`.
      // It is safer to use from `apacheds` since that is the implementation.
      exclude module: "mina-core"
    }
    testCompile libs.apachedsCoreApi
    testCompile libs.apachedsInterceptorKerberos
    testCompile libs.apachedsProtocolShared
    testCompile libs.apachedsProtocolKerberos
    testCompile libs.apachedsProtocolLdap
    testCompile libs.apachedsLdifPartition
    testCompile libs.apachedsMavibotPartition
    testCompile libs.apachedsJdbmPartition
    testCompile libs.junitJupiter
    testCompile libs.slf4jlog4j
    testCompile(libs.jfreechart) {
      exclude group: "junit", module: "junit"
    }
  }

目标就是把下图的 log4j 依赖配置好。

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原文链接：https://www.cnblogs.com/allenwas3/p/9549915.html

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