title: com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/android/gms/internal/zzbn.class
body: <p>After adding the firebase sdk to gradle facing  the below issue.</p>
  
  <p>Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.</p>
  
  <blockquote>
    <p>com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/android/gms/internal/zzbn.class</p>
  </blockquote>
  
  <p>Kindly help!!</p>
  
  <pre><code>This is the APP gradle file 
  
  apply plugin: 'com.android.application'
  apply plugin: 'io.fabric'
  apply plugin: 'me.tatarka.retrolambda'
  apply plugin: 'com.fernandocejas.frodo'
  apply plugin: 'realm-android'
  apply plugin: 'com.neenbedankt.android-apt'
  
  
  android {
      compileSdkVersion 23
      buildToolsVersion '23.0.2'
  
      defaultConfig {
          applicationId "com.bt.bms"
          minSdkVersion 16
          targetSdkVersion 23
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
          versionCode 6
          versionName "0.0.11"
          multiDexEnabled true
  
          // Following line of code added to provide support for blurring image using renderscript
          renderscriptTargetApi 16
          renderscriptSupportModeEnabled true
      }
  
      signingConfigs {
          bms_debug_config {
              keyAlias 'androiddebugkey'
              keyPassword 'android'
              storeFile file('bms_new_app_debug.keystore')
              storePassword 'android'
          }
      }
  
      packagingOptions {
          exclude 'APK LICENSE.txt'
          exclude 'LICENSE.txt'
          exclude 'META-INF/services/javax.annotation.processing.Processor'
      }
  
      buildTypes {
  //        debug {
  //            applicationIdSuffix ".debug"
  //            minifyEnabled false
  //            debuggable true
  //        }
          release {
              minifyEnabled false
              proguardFiles 'proguard.cfg'
          }
  
          debug {
              signingConfig signingConfigs.bms_debug_config
          }
      }
  
      compileOptions {
          sourceCompatibility JavaVersion.VERSION_1_8
          targetCompatibility JavaVersion.VERSION_1_8
      }
      lintOptions {
  
          checkReleaseBuilds true
  
      }
      defaultPublishConfig "debug"
  
      repositories {
  
          jcenter()
  
          maven {url = "https://oss.sonatype.org/content/repositories/snapshots/" }
          flatDir {
              dirs 'libs'
          }
      }
  
      dexOptions {
          incremental true
          javaMaxHeapSize "8g"
      }
  }
  
  String getJavaHome(String version) {
      def stdout = new ByteArrayOutputStream()
      exec {
          commandLine "/usr/libexec/java_home", "-v", version
          standardOutput = stdout;
      }
      return stdout.toString().trim()
  }
  
  retrolambda {
      //jvmArgs '-noverify'
      jdk System.getenv('JAVA8_HOME') ?: getJavaHome("1.8")
      oldJdk System.getenv('JAVA7_HOME') ?: getJavaHome("1.7")
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile project(':common')
      compile project(':domain')
      compile project(':api')
      apt project(':compiler')
  
      // Times Square Library for calendar
      compile project(':timessquare')
  
      // App Modules
      compile(name: 'app-models', ext: 'aar')
      compile(name: 'app-network', ext: 'aar')
      compile(name: 'app-error', ext: 'aar')
  
      // Android support libraries
      compile 'com.android.support:appcompat-v7:23.4.0'
      compile 'com.android.support:design:23.4.0'
      compile 'com.android.support:cardview-v7:23.4.0'
      compile 'com.android.support:percent:23.4.0'
      compile 'com.android.support:recyclerview-v7:23.4.0'
      compile 'com.android.support:palette-v7:23.4.0'
  
      //Play Services Location and Map
      compile 'com.google.android.gms:play-services-location:9.0.2'
  
  
      // For G+ login
      compile 'com.google.android.gms:play-services-auth:9.0.2'
      compile 'com.google.android.gms:play-services-plus:9.0.2'
  
      // Facebook
      compile ('com.facebook.android:facebook-android-sdk:4.7.0'){
          exclude group: 'com.google.android.gms'
      }
  
      // For Clever Tap
      compile 'com.clevertap.android:clevertap-android-sdk:2.0.5'
  
  
      // Espresso Related Dependencies
      compile 'com.android.support.test.espresso:espresso-idling-resource:2.2'
      testCompile 'com.android.support.test:testing-support-lib:0.1'
      androidTestCompile('com.android.support.test.espresso:espresso-core:2.2') {
          // Necessary if your app targets Marshmallow (since Espresso hasn't moved to Marshmallow yet)
          exclude group: 'com.android.support', module: 'support-annotations'
      }
      androidTestCompile('com.android.support.test:runner:0.3') {
          // Necessary if your app targets Marshmallow (since the test runner hasn't moved to Marshmallow yet)
          exclude group: 'com.android.support', module: 'support-annotations'
      }
      androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2') {
          // Necessary to avoid version conflicts
          exclude group: 'com.android.support', module: 'appcompat'
          exclude group: 'com.android.support', module: 'support-v4'
          exclude group: 'com.android.support', module: 'support-annotations'
          exclude module: 'recyclerview-v7'
      }
      androidTestCompile('com.android.support.test.espresso:espresso-intents:2.2') {
          exclude group: 'com.android.support', module: 'support-annotations'
      }
  
      // Retrofit
      compile 'com.squareup.retrofit:retrofit:2.0.0-beta4'
      compile 'com.squareup.okhttp:okhttp:2.4.0'
      compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
      compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'
      compile 'com.squareup.okhttp:okhttp-urlconnection:2.2.0'
  
      // Reactive x
      compile 'io.reactivex:rxandroid:1.0.1'
      compile 'javax.inject:javax.inject:1'
  
      // Picasso
      compile 'com.squareup.picasso:picasso:2.4.0'
  
      // Butterknife
      compile 'com.jakewharton:butterknife:7.0.1'
  
      // Dagger 2 dependencies
      apt 'com.google.dagger:dagger-compiler:2.0'
      compile 'com.google.dagger:dagger:2.0'
  
      // Crashlytics
      compile('com.crashlytics.sdk.android:crashlytics:2.5.5@aar') {
          transitive = true;
      }
  
      // Anotation
      compile 'javax.annotation:javax.annotation-api:1.2'
  
      // Other
      compile 'com.alexvasilkov:foldable-layout:1.0.1'
      compile 'com.ms-square:expandableTextView:0.1.4'
      compile 'com.mikhaellopez:circularimageview:2.0.1'
      compile 'com.makeramen:roundedimageview:2.2.1'
  
      // For Multidex
      compile 'com.android.support:multidex:1.0.1'
  
      //For Bottom Sheet
      compile 'com.flipboard:bottomsheet-core:1.5.0'
      compile 'com.flipboard:bottomsheet-commons:1.5.0'
  
      // For Juspay
      compile('in.juspay:godel:0.6.7') {
          exclude group: 'com.android.support', module: 'appcompat'
          exclude group: 'com.android.support', module: 'support-v4'
      }
  
      // For mockito
      compile 'org.mockito:mockito-all:2.0.2-beta'
  
      // Parceler
      compile 'org.parceler:parceler-api:1.0.4'
      apt 'org.parceler:parceler:1.0.4'
  
      // Expandable Recycler View
      compile 'com.github.grennis:ExpandableRecyclerView:0.9.3'
  
      // For JW Player
      compile project(':jwplayer-android-sdk-2.1.1+142')
      compile 'com.google.android.libraries.cast.companionlibrary:ccl:2.8.3'
  
      //Sectioned RecyclerView
      compile 'eu.davidea:flexible-adapter:5.0.0-b6'
  
  
      compile 'jp.wasabeef:recyclerview-animators:2.2.3'
  
      debugCompile 'com.github.promeg:xlog-compiler:2.1.1' // ~6kB
      debugCompile 'com.github.promeg:xlog-android:2.1.1' // ~150kB
  
      releaseCompile 'com.github.promeg:xlog-android-idle:2.1.1' // ~5kB
  
      debugCompile 'com.squareup.leakcanary:leakcanary-android:1.4-beta2'
      releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.4-beta2'
      testCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.4-beta2'
  
      // For Firebase
      compile 'com.google.firebase:firebase-core:9.0.2'
      compile 'com.google.firebase:firebase-config:9.0.2'
  }
  
  
  // ADD THIS AT THE BOTTOM
  apply plugin: 'com.google.gms.google-services'
  </code></pre>