title: java util zip ZipException: duplicate entry
body: <p>While running the project I'm getting this error</p>
  
  <blockquote>
    <p>Error:Execution failed for task ':..........'.
    com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: javax/annotation/CheckForNull.class</p>
  </blockquote>
  
  <p>This is how my app:gradle looks like :</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 24
  buildToolsVersion "24.0.3"
  useLibrary  'org.apache.http.legacy'
  
  defaultConfig {
      applicationId "com.sample.Example"
      minSdkVersion 15
      targetSdkVersion 24
      multiDexEnabled true
  }
  
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
      }
  }
  }
  
  dependencies {
  compile (project(':library')){
      exclude module: 'support-v4'
  }
  compile (project(':facebookLib')){
      exclude module: 'support-v4'
  }
  compile 'com.google.http-client:google-http-client-gson:1.20.0'
  compile 'com.google.code.gson:gson:2.4'
  compile files('libs/CWAC-SackOfViewsAdapter.jar')
  compile files('libs/FlurryAgent.jar')
  compile files('libs/google-api-client-1.15.0-rc.jar')
  compile files('libs/google-api-client-android-1.15.0-rc.jar')
  compile files('libs/google-api-services-androidpublisher-v1-rev15-1.15.0-rc.jar')
  compile files('libs/google-http-client-1.15.0-rc.jar')
  compile files('libs/google-http-client-android-1.15.0-rc.jar')
  compile files('libs/google-http-client-jackson-1.15.0-rc.jar')
  compile files('libs/google-http-client-jackson2-1.15.0-rc.jar')
  compile files('libs/google-oauth-client-1.15.0-rc.jar')
  compile files('libs/google-oauth-client-java6-1.15.0-rc.jar')
  compile files('libs/httpmime-4.2.jar')
  compile files('libs/in-app-purchasing-1.0.3.jar')
  compile files('libs/jackson-core-2.1.3.jar')
  compile files('libs/jackson-core-asl-1.9.11.jar')
  compile files('libs/json_simple-1.1.jar')
  compile files('libs/jsr305-1.3.9.jar')
  compile files('libs/picasso-2.1.1.jar')
  compile files('libs/signpost-commonshttp4-1.2.1.1.jar')
  compile files('libs/signpost-core-1.2.1.1.jar')
  compile files('libs/signpost-jetty6-1.2.1.1.jar')
  compile files('libs/twitter4j-core-4.0.1.jar')
  compile files('libs/amazon-device-messaging-1.0.1.jar')
  compile 'com.google.android.gms:play-services:9.6.1'
  compile 'com.android.support:appcompat-v7:24.2.1'
  compile 'com.android.support:support-v4:24.2.1'
  compile 'com.android.support:design:24.2.1'
  compile 'com.android.support:recyclerview-v7:24.2.1'
  compile 'com.android.support:cardview-v7:24.2.1'
  compile 'com.android.support:multidex:1.0.1'
  }
  </code></pre>
  
  <p>volley:gradle</p>
  
  <pre><code>android {
  compileSdkVersion 17
  buildToolsVersion "24.0.3"
  
  defaultConfig {
      minSdkVersion 8
      targetSdkVersion 8
  }
  
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
      }
  }
  }
  </code></pre>
  
  <p>library:gradle </p>
  
  <pre><code>android {
  compileSdkVersion 16
  buildToolsVersion "23.0.3"
  
  defaultConfig {
      minSdkVersion 4
      targetSdkVersion 4
  }
  
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
      }
  }
  }
  
  dependencies {
  compile 'com.android.support:support-v4:18.0.0'
  }
  </code></pre>
  
  <p>facebookLib:gradle</p>
  
  <pre><code>android {
  compileSdkVersion 17
  buildToolsVersion "24.0.3"
  
  defaultConfig {
      minSdkVersion 8
      targetSdkVersion 8
  }
  
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
      }
  }
  }
  
  dependencies {
  compile 'com.android.support:support-v4:18.0.0'
  }
  </code></pre>
  
  <p>Can someone suggest a way out of this error ? 
  Thanks in advance.</p>