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java – Multiple dex files define <my package>/BuildConfig, can't find the cause:

Posted by: admin April 23, 2020 Leave a comment


I’m using the new gradle build system and I’m facing the following problem:

com.android.dex.DexException: Multiple dex files define Lcom/kibo/mobi/BuildConfig;
    at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:594)
    at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:552)
    at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:533)
    at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:170)
    at com.android.dx.merge.DexMerger.merge(DexMerger.java:188)
    at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:439)
    at com.android.dx.command.dexer.Main.runMonoDex(Main.java:287)
    at com.android.dx.command.dexer.Main.run(Main.java:230)
    at com.android.dx.command.dexer.Main.main(Main.java:199)
    at com.android.dx.command.Main.main(Main.java:103)

Priniting the dependencies I can’t see anything, here they are:

 firstDebugCompile - ## Internal use, do not manually configure ##
 \--- KiboGradle:KiboSDK:unspecified
 +--- KiboGradle:TextInputAPI:unspecified
 +--- KiboGradle:VoiceImeUtils:unspecified
 +--- com.google.android.gms:play-services:5.0.77
 |    \--- com.android.support:support-v4:19.1.0
 +--- com.squareup.picasso:picasso:2.3.2
 +--- com.google.code.gson:gson:2.2.4
 \--- com.crittercism:crittercism-android-agent:4.5.1

I tried to verify that the problem is not a duplicate support library so I tried to add:

compile ('com.google.android.gms:play-services:5.0.77'){
    exclude module: 'support-v4'

Which resulted in errors that some of the support-v4 library classes can’t be found, so this library not getting compiled from any other location.

One thing I had in mind that could cause this problem is the fact that I using the Flavors feautre in oreder to create several versions of my application with different resourse files.

And when I look at the file that is in the error I see this:

* Automatically generated file. DO NOT MODIFY
package com.kibo.mobi;

public final class BuildConfig {
  public static final boolean DEBUG = Boolean.parseBoolean("true");
  public static final String PACKAGE_NAME = "com.kibo.mobi.test.official";
  public static final String BUILD_TYPE = "debug";
  public static final String FLAVOR = "liverpool";
  public static final int VERSION_CODE = 1;
  public static final String VERSION_NAME = "1.0";

So the package in of the file and the package specified in String value are not the same.

Can anyone see any issues in my configuration that could cause this problem?

How to&Answers:

In my case the similar error happened because there were 2 modules with the same package name in AndroidManifest.xml files. Using different package names in the modules solved the problem.

Also the same thing happens when a library jar is being included twice (or more times) in several modules, as a dependency. In this case error message says about duplicate configs named after that library’s package name. I solved it with including the library as a dependency in one module, and the second module had in dependencies the first module.


Add this to your build.gradle:

android {
    dexOptions {
        preDexLibraries = false

I suppose this way there is no conflicting BuildConfig.java.


Why the above works:
Android studio will first dex the libraries before dex-ing the app module. If you have a library module with a same package name as your app module, this ‘pre-dexing’ will result in creation of a BuildConfig.java in the same package as for the app.

Not ‘pre-dexing’ will slow down your build process a bit so I suggest that you change your library’s package name instead.


For me, simply doing a clean on the project cleared this error.


I was getting this problem signing my instant apk.
The problem:

bad module/app/manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

Just adding the .app at the end of the package name


If using NewRelic, then update it to at least 5.21.1.