title: Gradle Build Failed - Duplicate files copied in APK META-INF
body: <p>I get this error as soon as I enter the <strong>elasticsearch</strong> dependency, </p>
  
  <p><code>compile 'org.elasticsearch.client:transport:5.0.0'</code></p>
  
  <p>Detailed error logcat: </p>
  
  <pre><code>Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDevDebug'.
  &gt; com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/io.netty.versions.properties
      File1: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-buffer\4.1.5.Final\b5fb6bccda4d63d4a74c9faccdf32f77ab66abc1\netty-buffer-4.1.5.Final.jar
      File2: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-handler\4.1.5.Final\6262900ee9487e62560030a136160df953b1cd6b\netty-handler-4.1.5.Final.jar
      File3: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-transport\4.1.5.Final\37126b370722ff9631ee13c91139aacec0a71d1d\netty-transport-4.1.5.Final.jar
      File4: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-codec-http\4.1.5.Final\87bda1b9ec7e3f75ca721fc87735cbedad2aa1a\netty-codec-http-4.1.5.Final.jar
      File5: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-resolver\4.1.5.Final\5f367bedcdc185a727fda3296b9a18014cdc22c4\netty-resolver-4.1.5.Final.jar
      File6: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-codec\4.1.5.Final\66bbf9324fa36467d041083f89328e2a24ec4f67\netty-codec-4.1.5.Final.jar
      File7: C:\Users\Dell\.gradle\caches\modules-2\files-2.1\io.netty\netty-common\4.1.5.Final\607f8433d8782445e72abe34e43a7e57e86a5e6c\netty-common-4.1.5.Final.jar
  </code></pre>
  
  <p>Gradle file:</p>
  
  <pre><code>    apply plugin: 'com.android.application'
      apply plugin: 'com.neenbedankt.android-apt'
  
      android {
          compileSdkVersion 25
          buildToolsVersion '25.0.3'
  
          defaultConfig {
              applicationId "..."
              minSdkVersion 18
              targetSdkVersion 25
              versionCode 6
              versionName "20170616.06"
              multiDexEnabled true
              ndk {
                  abiFilter "armeabi-v7a"
              }
  
          }
  
          buildTypes {
              release {
                  minifyEnabled false
                  proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
                  //    signingConfig signingConfigs.release
              }
          }
          productFlavors {
              dev {
                  applicationId "..."
                  minSdkVersion 21
              }
              prod {
                  applicationId "..."
              }
          }
          packagingOptions {
              exclude 'META-INF/LICENSE'
              exclude 'META-INF/DEPENDENCIES'
              exclude 'META-INF/LICENSE-FIREBASE.txt'
              exclude 'META-INF/NOTICE'
              exclude 'META-INF/DEPENDENCIES.txt'
              exclude 'META-INF/LICENSE.txt'
              exclude 'META-INF/NOTICE.txt'
              exclude 'META-INF/NOTICE'
              exclude 'META-INF/LICENSE'
              exclude 'META-INF/DEPENDENCIES'
              exclude 'META-INF/notice.txt'
              exclude 'META-INF/license.txt'
              exclude 'META-INF/dependencies.txt'
              exclude 'META-INF/LGPL2.1'
  
          }
          lintOptions {
              abortOnError false
          }
      }
      repositories {
          jcenter()
          maven { url "https://dl.bintray.com/drummer-aidan/maven" }
          mavenCentral()
      }
      configurations {
          compile.exclude group: "org.apache.httpcomponents", module: "httpclient"
      }
      dependencies {
          compile fileTree(dir: 'libs', include: ['*.jar'])
          // https://mvnrepository.com/artifact/commons-io/commons-io
          compile group: 'commons-io', name: 'commons-io', version: '2.4'
  
          compile 'com.android.support:appcompat-v7:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:cardview-v7:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:recyclerview-v7:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-v4:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:design:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:percent:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:animated-vector-drawable:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-annotations:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-compat:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-core-ui:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-v13:' + rootProject.ext.supportLibraryVersion
          compile 'com.android.support:support-v4:' + rootProject.ext.supportLibraryVersion'        
  
          compile 'com.google.firebase:firebase-storage:' + rootProject.ext.firebaseVersion
          compile 'com.google.firebase:firebase-common:' + rootProject.ext.firebaseVersion
          compile 'com.google.firebase:firebase-auth:' + rootProject.ext.firebaseVersion
          compile 'com.google.firebase:firebase-database:' + rootProject.ext.firebaseVersion
          compile 'com.google.firebase:firebase-crash:' + rootProject.ext.firebaseVersion
          compile 'com.google.firebase:firebase-core:' + rootProject.ext.firebaseVersion
          // this line must be included to integrate with Firebase
          compile 'com.google.firebase:firebase-messaging:' + rootProject.ext.firebaseVersion
          // this line must be included to use FCM
          compile 'com.google.firebase:firebase-ads:' + rootProject.ext.firebaseVersion
  
          compile 'com.google.android.gms:play-services-auth:' + rootProject.ext.firebaseVersion
          compile 'com.google.android.gms:play-services-plus:' + rootProject.ext.firebaseVersion
          compile 'com.google.android.gms:play-services-location:' + rootProject.ext.firebaseVersion
          compile 'com.google.android.gms:play-services-places:' + rootProject.ext.firebaseVersion
  
  
      compile "im.ene.toro2:toro-ext-exoplayer2:${toroVersion}"
      compile group: 'com.google.code.gson', name: 'gson', version: '2.8.0'
  
  
      compile 'com.jakewharton:butterknife:' + rootProject.ext.butterknifeVersion
      apt 'com.jakewharton:butterknife-compiler:' + rootProject.ext.butterknifeVersion
  
      //RxAndroid
      compile 'io.reactivex:rxandroid:' + rootProject.ext.rxandroidVersion
      compile 'io.reactivex:rxjava:' + rootProject.ext.rxjavaVersion
      compile 'com.squareup.retrofit2:adapter-rxjava:' + rootProject.ext.retroRxAdapterVersion
      compile 'com.squareup.picasso:picasso:2.5.2'
      compile 'com.google.firebase:firebase-auth:10.0.1'
      compile 'com.firebaseui:firebase-ui-database:0.4.0'
      compile 'com.google.firebase:firebase-invites:10.2.1'
      compile 'com.firebase:firebase-client-android:2.5.2+'
      compile 'com.facebook.android:facebook-android-sdk:[4,5)'
      compile 'com.android.support:multidex:1.0.1'
      compile 'pub.devrel:easypermissions:0.1.5'
      compile 'com.github.bumptech.glide:glide:3.6.0'
      compile 'de.hdodenhof:circleimageview:2.0.0'
      compile 'com.fasterxml.jackson.core:jackson-databind:2.7.3'
      compile 'com.danikula:videocache:2.6.4'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      compile 'com.dinuscxj:circleprogressbar:1.1.1'
      compile 'com.afollestad.material-dialogs:core:0.9.4.5'
      compile 'com.afollestad:easyvideoplayer:0.3.0'
      compile 'com.googlecode.mp4parser:isoparser:1.1.22'
      compile 'javax.inject:javax.inject:1'
      compile 'com.google.firebase:firebase-storage:10.0.1'
      testCompile 'junit:junit:4.12'
      compile 'com.google.api-client:google-api-client:1.21.0'
      compile 'com.google.apis:google-api-services-people:v1-rev2-1.21.0'
      compile 'org.elasticsearch.client:transport:5.0.0'
  
      compile project(':ffmpeg4android_lib')
  
  }
  
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p><strong>PS: There are a lot of similar posts already on SO, but none of them helped me</strong> </p>
  
  <p>Can someone help me with this? Also, please tell me a generic way to solve these issues.</p>