Duplicate entry: com/android/volley/Request$Priority.class

[ThathaPavanNagaraju]

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:transformClassesWithJarMergingForDebug'.

  com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/android/volley/Request$Priority.class

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

[habeebrahmanpt]

i getting same issue
Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.

com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/android/volley/Request$Priority.class

[heartandsoul]

can you please check my gardle file? i have the same problem
What went wrong:
Execution failed for task ':app:transformClassesWithJarMergingForRelease'.

com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/android/volley/Request$Priority.class

My gardle file:

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion '25.0.0'

defaultConfig {
    applicationId "com.heartandsoulcafe.heartandsoul"
    minSdkVersion 19
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
    multiDexEnabled true
}
configurations {
    all*.exclude group: 'com.android.volley', module: 'volley:volley'
    all*.exclude group: 'com.mcxiaoke.volley', module: 'volley:library-aar'
}


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
sourceSets { main { assets.srcDirs = ['src/main/assets', 'src/main/assets/2'] } }

}

dependencies {
compile project(':picasso-2.5.2')
compile project(':GenAsync')
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.volley:volley:1.0.0'
compile 'com.mcxiaoke.volley:library-aar:1.0.1'
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:support-v4:23.4.0'
compile 'com.google.android.gms:play-services-appindexing:9.6.1'
compile 'com.google.android.gms:play-services:9.6.1'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
compile 'com.android.support:multidex:1.0.1'

testCompile 'junit:junit:4.12'

}

[ThathaPavanNagaraju]

This issue occurs basically if there are duplicate libraries in two or more dependencies,

compile project(':picasso-2.5.2'){
transitive = true;
}
compile project(':GenAsync'){
transitive = true;
}
if this doesn't work see which of these above two dependencies uses volley and try to exclude that volley library during building gradle.