Signing failed after updating Android Studio

Question

I updated my android studio from 1.5 version to current latest v2.1.1 and also updated build tools version to 2.1.0 and gradle distributionUrl to https://services.gradle.org/distributions/gradle-2.10-all.zip

After updating this changes, I am able to run the application on device but when I try to code sign the application getting this error -

Error:Execution failed for task ':projectName:transformClassesWithJarMergingForRelease'. com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/android/internal/http/multipart/PartSource.class

Here's look at my build.gradle file -

apply plugin: 'com.android.application'

android {
   signingConfigs {
    config {
        keyAlias 'aliasname'
        keyPassword ''
        storeFile file('/opt/keystorename.keystore')
        storePassword ''
    }
   }
   compileSdkVersion 23
   buildToolsVersion "23.0.3"
   defaultConfig {
    applicationId "com.companyname.project"
    minSdkVersion 9
    targetSdkVersion 23
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
    multiDexEnabled true
}
dexOptions{
    incremental true
}

  buildTypes {
    release {
         minifyEnabled false
         proguardFiles getDefaultProguardFile('proguard-android.txt')
         signingConfig signingConfigs.config
         zipAlignEnabled true
     }
 }
}

dependencies {
  compile project(':libraryInfiniteScrollListView')
  compile project(':libraryPagerSlidingTabStrip')
  compile project(':libraryParallaxScroll')
  compile project(':library_CardView_Supportv7')
  compile(project(':librarySwipeListView'))

  compile 'com.google.android.gms:play-services-base:8.4.0'
  compile 'com.google.android.gms:play-services-plus:8.4.0'
  compile 'com.google.android.gms:play-services-location:8.4.0'
  compile 'com.google.android.gms:play-services-gcm:8.4.0'
  compile 'com.android.support:appcompat-v7:23.4.0'
  compile files('libs/AndroidEasingFunctions-1.0.0.jar')
  compile files('libs/AndroidViewAnimations-1.0.6.jar')
  compile files('libs/calligraphy-1.1.0.jar')
  compile files('libs/flexjson-2.1.jar')
  compile files('libs/libBeaconService.jar')
  compile files('libs/libraryhttploopj.jar')
  compile files('libs/localytics.jar')
  compile 'com.nineoldandroids:library:2.4.0'
  compile files('libs/universal-image-loader-1.9.3.jar')
  compile files('libs/YouTubeAndroidPlayerApi.jar')
  compile 'com.android.support:multidex:1.0.1'
  // org.apache.http package is deprecated and removed in 23 sdk version and above
  compile files('libs/org.apache.http.legacy.jar')
}

And My application class is extending MultiDexApplication class instance.

I have even updated my buildToolsVersion to "23.0.3" from "23.0.1" but still getting the same above error.

It will be really helpful if someone can point out what is broken?

Answer 1

So it finally turns out that PartSource.class was present in org.apache.http.legacy.jar. And org.apache.http.legacy.jar was added as a dependency in one of the library project and also in project's dependency. It was resolved by commenting out the org.apache.http.legacy.jar dependency in project's gradle.

Still I have no clue as to why it was working on older android studio version and why it is working if i run/debug the app. But still, problem is resolved now