NoClassDefFoundError: io/reactivex/Observable

[devganiyahitesh1]

• I am using aws dynamodb with android application

• SDK version : com.amazonaws:aws-android-sdk-ddb-mapper:2.6.15

• Issue facing and devices and emulator.

• Not facing issue greater android API 21

• Facing issue with kitkat and below versions

  private static AmazonDynamoDBClient ddb; private static DynamoDBMapper mapper;

  DynamoDBManager() { if (mapper == null) { ddb = MyApplication.clientManager.ddb(); mapper = DynamoDBMapper.builder().dynamoDBClient(ddb) .build(); } } void saveObject(Object object) { mapper.save(object); // Crash on this line } buildscript { repositories { maven { url 'https://maven.fabric.io/public' } }

  dependencies { classpath 'io.fabric.tools:gradle:1.+' } } apply plugin: 'com.android.application' apply plugin: 'io.fabric'

repositories { maven { url 'https://maven.fabric.io/public' } }

apply plugin: 'realm-android' android {

compileSdkVersion 27
defaultConfig {
    applicationId "com.xxx"
    minSdkVersion 16
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    vectorDrawables.useSupportLibrary = true
    multiDexEnabled true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        debuggable true
    }
}
packagingOptions {
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/DEPENDENCIES'
}
productFlavors {
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

}

dependencies { implementation 'com.google.firebase:firebase-messaging:11.8.0' implementation 'com.google.firebase:firebase-crash:11.8.0' implementation 'com.google.android.gms:play-services-maps:11.8.0' implementation fileTree(include: ['*.jar'], dir: 'libs') implementation 'com.google.android.gms:play-services-places:11.8.0' implementation 'io.reactivex:rxjava:1.3.6' implementation 'jp.wasabeef:glide-transformations:3.1.0' implementation 'com.facebook.android:facebook-login:4.31.0' implementation 'com.android.support:multidex:1.0.3' implementation "com.android.support:cardview-v7:$support_version" implementation "com.android.support:appcompat-v7:$support_version" implementation "com.android.support:design:$support_version" implementation "com.android.support:recyclerview-v7:$support_version" implementation 'com.android.support.constraint:constraint-layout:1.0.2' implementation 'com.google.android.gms:play-services-auth:11.8.0' implementation 'com.dlazaro66.qrcodereaderview:qrcodereaderview:2.0.3' implementation 'com.amazonaws:aws-android-sdk-ddb-mapper:2.6.15' implementation 'com.amazonaws:aws-android-sdk-s3:2.6.15' implementation 'com.amazonaws:aws-android-sdk-lambda:2.6.15' implementation 'com.google.zxing:core:3.3.0' implementation 'org.elasticsearch.client:elasticsearch-rest-client-sniffer:6.2.1' implementation 'com.devbrackets.android:exomedia:4.1.0' implementation 'com.github.chrisbanes:PhotoView:2.1.3' compile('com.crashlytics.sdk.android:crashlytics:2.9.0@aar') { transitive = true; } }

[mutablealligator]

Thank you @devganiyahitesh1 for reporting to us.

The following dependencies might have a conflicting file RxJava. compile 'com.android.support.constraint:constraint-layout:1.0.2' compile 'io.reactivex:rxjava:1.3.6'

[devganiyahitesh1]

Yes, got solution for the same. I have remove some unused dependency and also removed rx java dependency io.reactivex.rxjava . In replacement of Rx java i have added some dummy classes in my package which is already described here https://realm.io/docs/java/latest.

// File 1
package io.reactivex;
public class Flowable {
}
// File 2
package io.reactivex;
public class Observable {
}
// File 3
package io.reactivex;
public enum BackpressureStrategy {
   LATEST;
}