Firebase chat adding to a project causes error in gradle built.

[sachinvarma.mo...@gmail.com]

hai friends,

iam new to firebase and i was not able to implement my firebase chat project to my another project.
the error showing is:

"Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.
> com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/fasterxml/jackson/core/base/GeneratorBase.class"

my build.gradle is:

apply plugin: 'com.android.application'
repositories {
    mavenLocal()
    flatDir {
        dirs 'libs'
    }
}
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.sac.comp.sac"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
        

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dexOptions {
        javaMaxHeapSize "4g"
    }
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE-FIREBASE.txt'
        exclude 'META-INF/NOTICE'
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'
    androidTestCompile 'com.android.support:support-annotations:23.4.0'
    testCompile 'junit:junit:4.12'
    compile 'com.wdullaer:materialdatetimepicker:2.1.1'
    compile 'com.github.clans:fab:1.6.2'
    compile files('libs/universal-image-loader-1.9.0.jar')
    compile 'com.squareup.okhttp:okhttp:2.4.0'
    compile 'com.squareup.okhttp:okhttp-urlconnection:2.2.0'
    compile files('libs/jackson-core-2.5.4.jar')
    compile 'com.github.bumptech.glide:glide:3.6.1'
    compile 'de.hdodenhof:circleimageview:2.0.0'
    compile 'com.etsy.android.grid:library:1.0.5'
    compile 'com.prolificinteractive:material-calendarview:1.3.0'
    compile 'com.google.android.gms:play-services:9.2.0'
    compile 'com.google.android.gms:play-services-auth:9.2.0'
    compile 'com.android.support:cardview-v7:23.4.0'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:appcompat-v7:23.4.0'

    compile 'com.google.firebase:firebase-database:9.2.0'
    compile 'com.google.firebase:firebase-auth:9.2.0'
    compile 'com.google.firebase:firebase-config:9.2.0'
    compile 'com.google.android.gms:play-services-appinvite:9.2.0'
    compile 'com.google.firebase:firebase-messaging:9.2.0'
    compile 'com.google.android.gms:play-services-ads:9.2.0'
    compile 'com.google.firebase:firebase-crash:9.2.0'
    compile 'com.google.firebase:firebase-analytics:9.2.0'
    compile 'com.firebaseui:firebase-ui-database:0.4.0'
    compile 'com.firebase:firebase-client-android:2.5.2'
}
apply plugin: 'com.google.gms.google-services'

pls help...
thanks in advance.

[Samuel Stern]

HI there,

There are a few problematic lines I can see right away:

    compile 'com.google.firebase:firebase-database:9.2.0'

    // ...

    compile 'com.firebaseui:firebase-ui-database:0.4.0'

    compile 'com.firebase:firebase-client-android:2.5.2'

First of all you are including both `firebase-database` and `firebase-client-android`.  You should only be including `firebase-database` if you intend to use the new Firebase products and access your database with the DatabaseReference class rather than the Firebase class.

Second, you should update your version of firebase-ui-database to 0.4.2, because that will avoid any dependency conflicts with firebase-database:9.2.0.

- Sam

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