Not able to generate signed apk? [DuplicatePlatformClasses error occured]

Question

I am getting this error,

Error: xpp3 defines classes that conflict with classes now provided by Android. Solutions include finding newer versions or alternative libraries that don't have the same problem (for example, for httpclient use HttpUrlConnection or okhttp instead), or repackaging the library using something like jarjar. [DuplicatePlatformClasses]

while generating signed apk. How can i solve this problem. Please help me!!

App Gradle,

 apply plugin: 'com.android.application'

android {
compileSdkVersion 26
buildToolsVersion '25.0.2'

defaultConfig {
    applicationId "com.casperon.app.rydepass"
    minSdkVersion 17
    targetSdkVersion 26
    versionCode 17
    versionName "4.2"
    multiDexEnabled true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
aaptOptions {
    cruncherEnabled = false
}

dexOptions {
    javaMaxHeapSize "4g"
}
packagingOptions {
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/license.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/notice.txt'
    exclude 'META-INF/ASL2.0'
}

useLibrary 'org.apache.http.legacy'
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile project(':slideDateTimePicker')
compile project(':CountryCodePicker')
compile 'com.android.support:appcompat-v7:24.0.0'
compile 'com.prolificinteractive:material-calendarview:1.4.3'
compile 'com.android.support:multidex:1.0.3'
compile 'com.mcxiaoke.volley:library:1.0.19'
compile 'com.github.ybq:Android-SpinKit:1.1.0'
compile 'com.squareup:android-times-square:1.6.5@aar'
compile 'com.google.android.gms:play-services:11.0.0'
compile 'com.android.support:cardview-v7:24.0.0'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.github.d-max:spots-dialog:0.7@aar'
compile 'com.android.support:support-annotations:24.0.0'
compile 'com.balysv:material-ripple:1.0.2'
compile 'com.github.paolorotolo:expandableheightlistview:1.0.0'
compile 'com.github.ganfra:material-spinner:1.1.0'
compile 'com.baoyz.swipemenulistview:library:1.3.0'
compile 'com.googlecode.libphonenumber:libphonenumber:8.7.0'
compile 'com.github.jakob-grabner:Circle-Progress-View:v1.2.2'
compile 'me.drakeet.materialdialog:library:1.2.2'
compile 'com.wang.avi:library:1.0.1'
compile 'com.android.support:design:24.0.0'
compile 'com.nineoldandroids:library:2.4.0'
compile 'com.prolificinteractive:material-calendarview:1.4.2'
compile 'org.igniterealtime.smack:smack-android:4.1.0-rc1'
compile 'org.igniterealtime.smack:smack-tcp:4.1.0-rc1'
compile 'org.igniterealtime.smack:smack-im:4.1.0-rc1'
compile 'org.igniterealtime.smack:smack-extensions:4.1.0-rc1'
compile 'net.hockeyapp.android:HockeySDK:3.5.0'
compile 'pl.droidsonroids.gif:android-gif-drawable:1.1.+'
compile 'org.jsoup:jsoup:1.8.3'
compile 'com.android.support:multidex:1.0.1'
compile 'com.github.crazy1235:RichEditText:v2.0'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'com.squareup:android-times-square:1.6.5@aar'
  //noinspection DuplicatePlatformClasses
 /* compile 'org.apache.httpcomponents:httpclient:4.5'*/
'org.apache.httpcomponents:httpclient:jar:4.5.6'

configurations {
    all {
        exclude module: 'httpclient'
        exclude module: 'commons-logging'
    }
}

Answer 1

I had similar problem. Apache library had been used in whole project and I couldn't exclude this library. Today I tried using jar file instead and it worked. You can download apache http library jar files from here: https://jar-download.com/artifacts/org.apache.httpcomponents

Answer 2

Try this,

   configurations {
    all*.exclude group: 'xpp3', module: 'xpp3'
    compile.exclude group: "org.apache.httpcomponents", module: "httpclient"
}