Android Gradle Duplicate files copied in APK META-INF/license.txt

I'm going to add RESTful Web Service support with Spring to my Android application as described here https://spring.io/guides/gs/consuming-rest-android/.

This is top-level build.gradle config:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

This is my app/build.gradle config:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example"
        minSdkVersion 8
        targetSdkVersion 17
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }

    dependencies {
        compile 'com.android.support:appcompat-v7:+'
        compile fileTree(dir: 'libs', include: ['*.jar'])
        compile 'org.springframework.android:spring-android-rest-template:1.0.1.RELEASE'
        compile 'com.fasterxml.jackson.core:jackson-databind:2.3.2'
    }

    packagingOptions {
        exclude 'META-INF/NOTICE' // will not include NOTICE file
        exclude 'META-INF/LICENSE' // will not include LICENSE file
    }
    
}

Right now it fails with a following error:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/license.txt
	File1: user\.gradle\caches\modules-2\files-2.1\org.springframework.android\spring-android-rest-template\1.0.1.RELEASE\e132d929bd181941f79b0d63edafb8a86ae6fd33\spring-android-rest-template-1.0.1.RELEASE.jar
	File2: user\.gradle\caches\modules-2\files-2.1\org.springframework.android\spring-android-core\1.0.1.RELEASE\e68f0e8e4b636ee30c4de58953be38d9b72a5e3b\spring-android-core-1.0.1.RELEASE.jar

What am I doing wrong and how to fix it ?

Write below lines in your app level gradle file

android {
	packagingOptions {
		exclude 'META-INF/DEPENDENCIES.txt'
		exclude 'META-INF/LICENSE.txt'
		exclude 'META-INF/NOTICE.txt'
		exclude 'META-INF/NOTICE'
		exclude 'META-INF/LICENSE'
		exclude 'META-INF/DEPENDENCIES'
		exclude 'META-INF/notice.txt'
		exclude 'META-INF/license.txt'
		exclude 'META-INF/dependencies.txt'
		exclude 'META-INF/LGPL2.1'
	}
}

If the solution in the selected answer does not fix your problem, try adding

    exclude 'META-INF/ASL2.0'

as well. Or basically, identify the name of the duplicate file and exclude it. The addition above fixed the issue for me.

Its helps me. Try this code:)

packagingOptions {
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
}

adding these lines helped me.

shadowJar {
    // Filtering shadow jar contents by file pattern.
    exclude 'schemaorg_apache_xmlbeans/attribute/**'
    exclude 'schemaorg_apache_xmlbeans/attributegroup/**'
    exclude 'schemaorg_apache_xmlbeans/element/**'
    exclude 'schemaorg_apache_xmlbeans/identityconstraint/**'
    exclude 'schemaorg_apache_xmlbeans/javaname/**'
    exclude 'schemaorg_apache_xmlbeans/modelgroup/**'
    exclude 'schemaorg_apache_xmlbeans/namespace/**'
    exclude 'schemaorg_apache_xmlbeans/src/**'
    exclude 'schemaorg_apache_xmlbeans/system/sXML*/**'
    exclude 'schemaorg_apache_xmlbeans/system/s8C3F193EE11A2F798ACF65489B9E6078/**'
    exclude 'schemaorg_apache_xmlbeans/type/**'

    exclude 'repackage/**'

    exclude 'LICENSE.txt'
    exclude 'NOTICE.txt'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/maven/**'

    // these are only needed when handling Visio files, remove it if you would like to use Visio support
    dependencies {
        exclude(dependency('com.github.virtuald:curvesapi'))
        exclude(dependency('commons-codec:commons-codec'))
    }

    // Relocate javax dependencies so Android does not choke
    relocate 'javax.xml.namespace', 'org.apache.poi.javax.xml.namespace'
    relocate 'javax.xml.stream', 'org.apache.poi.javax.xml.stream'
    relocate 'javax.xml.XMLConstants', 'org.apache.poi.javax.xml.XMLConstants'
}

This one worked for me:

    packagingOptions {
    exclude 'META-INF/DEPENDENCIES.txt'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/notice.txt'
    exclude 'META-INF/license.txt'
    exclude 'META-INF/dependencies.txt'
    exclude 'META-INF/LGPL2.1'
    exclude 'META-INF/spring.schemas'
    exclude 'META-INF/spring.tooling'
    exclude 'META-INF/INDEX.LIST'
    exclude 'META-INF/spring.handlers'
}
configurations {
    all*.exclude module: 'classworlds'
    all*.exclude module: 'commons-logging'
    all*.exclude module: 'httpclient'
    all*.exclude module: 'maven-artifact'
    all*.exclude module: 'maven-artifact-manager'
    all*.exclude module: 'maven-error-diagnostics'
    all*.exclude module: 'maven-model'
    all*.exclude module: 'maven-project'
    all*.exclude module: 'maven-settings'
    all*.exclude module: 'plexus-container-default'
    all*.exclude module: 'plexus-interpolation'
    all*.exclude module: 'plexus-utils'
    all*.exclude module: 'wagon-file'
    all*.exclude module: 'wagon-http-lightweight'
    all*.exclude module: 'wagon-provider-api'

}

Use

packagingOptions {
   merge'META-INF/license.txt'
}

or if they are the same

packagingOptions {
   pickFirst  'META-INF/license.txt'
}