构建 Android APK 时出现 DuplicateFileException 错误

Question

我在 Windows 7 上使用 Android Studio 2.0。在构建我的 Android 项目时，我收到以下错误：

:app:transformResourcesWithMergeJavaResForDebug FAILED

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 com/google/appengine/repackaged/org/apache/commons/codec/language/bm/sep_approx_spanish.txt
File1: C:\Users\USER\.gradle\caches\modules-2\files-2.1\com.google.appengine\appengine-api-1.0-sdk\1.9.28\e92c18272b555027d9ec666e7a89162f10638314\appengine-api-1.0-sdk-1.9.28.jar
File2: C:\Users\USER\.gradle\caches\modules-2\files-2.1\com.google.appengine\appengine-endpoints\1.9.28\bf2e8a74bd28e388b3487fc78a0c7adfa592fd5d\appengine-endpoints-1.9.28.jar`

我已经挖掘了几个小时，但看不到任何导致此问题的原因。我已经在我的主目录中删除了 .gradle ，但它只是重建它。有谁知道这是什么原因？

完整的 gradle 输出：

Executing tasks: [:app:clean, :app:generateDebugSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies, :app:generateDebugAndroidTestSources, :app:assembleDebug]

Configuration on demand is an incubating feature.
WARNING: Dependency org.apache.httpcomponents:httpclient:4.0.1 is ignored for debug as it may be conflicting with the internal version provided by Android.
     In case of problem, please repackage it with jarjar to change the class packages
WARNING: Dependency org.apache.httpcomponents:httpclient:4.0.1 is ignored for release as it may be conflicting with the internal version provided by Android.
     In case of problem, please repackage it with jarjar to change the class packages
Incremental java compilation is an incubating feature.
:app:clean
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:backend:appengineDownloadSdk
:backend:compileJava
:backend:processResources UP-TO-DATE
:backend:classes
:backend:appengineEndpointsGetClientLibs UP-TO-DATE
:backend:appengineEndpointsExpandClientLibs UP-TO-DATE
:backend:compileEndpointsSrcJava
:backend:processEndpointsSrcResources UP-TO-DATE
:backend:endpointsSrcClasses
:backend:_appengineEndpointsAndroidArtifact UP-TO-DATE
:backend:jar UP-TO-DATE
:app:prepareComAndroidSupportAnimatedVectorDrawable2330Library
:app:prepareComAndroidSupportAppcompatV72330Library
:app:prepareComAndroidSupportSupportV42330Library
:app:prepareComAndroidSupportSupportVectorDrawable2330Library
:app:prepareComGoogleAndroidGmsPlayServicesAuth840Library
:app:prepareComGoogleAndroidGmsPlayServicesBase840Library
:app:prepareComGoogleAndroidGmsPlayServicesBasement840Library
:app:prepareComGoogleAndroidGmsPlayServicesMeasurement840Library
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:processDebugGoogleServices
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:mockableAndroidJar UP-TO-DATE
:app:preDebugUnitTestBuild UP-TO-DATE
:app:prepareDebugUnitTestDependencies
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:prepareDebugAndroidTestDependencies
:app:compileDebugAndroidTestAidl
:app:processDebugAndroidTestManifest
:app:compileDebugAndroidTestRenderscript
:app:generateDebugAndroidTestBuildConfig
:app:generateDebugAndroidTestAssets UP-TO-DATE
:app:mergeDebugAndroidTestAssets
:app:generateDebugAndroidTestResValues UP-TO-DATE
:app:generateDebugAndroidTestResources
:app:mergeDebugAndroidTestResources
:app:processDebugAndroidTestResources
:app:generateDebugAndroidTestSources
:app:compileDebugJavaWithJavac
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources
:app:buildInfoDebugLoader
:app:transformClassesWithExtractJarsForDebug
:app:transformClassesWithInstantRunVerifierForDebug
:app:transformClassesWithJavaResourcesVerifierForDebug UP-TO-DATE
:app:mergeDebugJniLibFolders
:app:transformNative_libsWithMergeJniLibsForDebug
:app:processDebugJavaRes UP-TO-DATE
:app:transformResourcesWithMergeJavaResForDebug FAILED

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 com/google/appengine/repackaged/org/apache/commons/codec/language/bm/sep_approx_spanish.txt
File1: C:\Users\USER\.gradle\caches\modules-2\files-2.1\com.google.appengine\appengine-api-1.0-sdk\1.9.28\e92c18272b555027d9ec666e7a89162f10638314\appengine-api-1.0-sdk-1.9.28.jar
File2: C:\Users\USER\.gradle\caches\modules-2\files-2.1\com.google.appengine\appengine-endpoints\1.9.28\bf2e8a74bd28e388b3487fc78a0c7adfa592fd5d\appengine-endpoints-1.9.28.jar


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 15.364 secs

据我所知，这是两个依赖项之间的冲突：

dependencies {
  appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.28'
  compile 'com.google.appengine:appengine-endpoints:1.9.28'
  compile 'com.google.appengine:appengine-endpoints-deps:1.9.28'
  compile 'javax.servlet:servlet-api:2.5'
  compile 'com.google.http-client:google-http-client-jackson2:1.20.0'
  compile 'com.google.http-client:google-http-client-gson:1.19.0'
}

我认为是这两个依赖：

appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.28'
compile 'com.google.appengine:appengine-endpoints:1.9.28'
compile 'com.google.appengine:appengine-endpoints-deps:1.9.28'

我无法删除任何这些，因为它会导致后端模块出现编译错误。然而，看起来这两个依赖项几乎相同。他们应该都在里面吗？任何建议表示赞赏！

Answer 1

完成@dsh 的回答：

在您的依赖关系树中有 2 个 jar 文件包含名为 sep_approx_spanish.txt 的相同文件，这是不允许的。

要解决您的问题，您必须跟踪您的 gradle 依赖项中的哪个具有名为 appengine-api-1.0-sdk-1.9.28.jar 和 appengine-endpoints-1.9.28.jar 的两个 jar；为此，您可以打开 android studio 的终端控制台并输入：

//if ou are on windows
gradlew dependencies

//if you are on unix based os
./gradlew dependencies

你会看到 gradle 做了很多事情，但在某个时候它会打印整个依赖树。一旦找到导致问题的 2 个依赖项，请在其中一个依赖项声明的末尾添加这段代码

{
    exclude "sep_approx_spanish.txt"
}

例如，如果两个依赖项是这些

compile 'com.google.appengine:appengine-endpoints:1.9.28'
compile 'com.google.appengine:appengine-endpoints-deps:1.9.28

如果必须成为

compile 'com.google.appengine:appengine-endpoints:1.9.28'{
        exclude "sep_approx_spanish.txt"
    }
 compile 'com.google.appengine:appengine-endpoints-deps:1.9.28

或

compile 'com.google.appengine:appengine-endpoints:1.9.28'
compile 'com.google.appengine:appengine-endpoints-deps:1.9.28'{
        exclude "sep_approx_spanish.txt"
    }

通过这种方式，您告诉 gradle 不要为两个库之一考虑该文件，从而避免文件在 apk 中的重复。

Answer 2

该错误告诉您构建 APK 会生成两个名为 com/google/appengine/repackaged/org/apache/commons/codec/language/bm/sep_approx_spanish.txt 的文件。这是失败的，因为 APK 在任何给定路径中只能包含一个文件。这可能是由包含该文件的类路径中的两个不同 jar 文件引起的。在我的项目中，这只发生在运行时未实际使用的文件中，因此我将它们完全排除在 APK 之外。

Answer 3

正在完成@Apperside 的回答。

我通过在我的应用模块的 build.gradle 文件中添加以下行来修复错误：

android{

    packagingOptions {
            exclude 'com/google/appengine/repackaged/org/apache/commons/codec/language/bm/*'
            exclude 'com/google/appengine/repackaged/org/codehaus/jackson/impl/VERSION.txt'
            exclude 'com/google/appengine/repackaged/org/apache/commons/codec/language/*'
        }

    (...)  
}