CODEWITHSUNDEEP
androidandroid-studioandroid-gradle-pluginandroid-multidex
Magnus Johansson
Magnus Johansson

Reputation: 28325

Why do I get duplicate entry: com/google/common/base/FinalizableReference.class?

When I add the Microsoft Azure Mobile Services SDK to my project:

compile 'com.microsoft.azure:azure-mobile-services-android-sdk:2.0.2'

I get this error:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:packageAllDebugClassesForMultiDex'.
> java.util.zip.ZipException: duplicate entry: com/google/common/base/FinalizableReference.class

What could be the reason and how do I solve this?
I'm guessing I could make some exclude rule for Gradle, but how would that look like?

Upvotes: 1

Views: 1863

Answers (2)

Blundell
Blundell

Reputation: 76536

it;s because you have two libraries that include the same java class. the command gradle dependencies should tell you what it is.

And you have a few choices of how to exclude a dependency:

dependencies {

 compile('com.microsoft.azure:azure-mobile-services-android-sdk:2.0.2') {


   exclude module: 'cglib' //by artifact name

   exclude group: 'org.jmock' //by group

   exclude group: 'com.unwanted', module: 'someLib' //by both name and group

 }

}

Upvotes: 1

Rafael Toledo
Rafael Toledo

Reputation: 5659

Running the task dependencies, we can see that the azure-mobile-services-android-sdk contains two dependencies.

\--- com.microsoft.azure:azure-mobile-services-android-sdk:2.0.2
     +--- com.google.code.gson:gson:2.3
     \--- com.google.guava:guava:18.0

The class reported as duplicate is from Guava. If you are not using it directly, probably another dependency is using it (probably with another version). A possibly fix for this is to exclude Guava from the dependency.

compile('com.microsoft.azure:azure-mobile-services-android-sdk:2.0.2') {
    exclude module: 'guava'
}

Edit:

Answering your comment, run the dependencies task in your project and try to find the other library that is using guava as a dependency (probably an older version of guava).

(in your project root folder)
$ cd app
(if you are running on OSX or Linux)
$ ../gradlew dependencies
(if you are running on Windows)
$ ../gradlew.bat dependencies

When you figure what dependency have guava, exclude it in the same way you did with azure before.

Upvotes: 5

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