Android X + Truth + Guava测试编译问题

Question

我有一个Android库（称为api）gradle模块作为一个较大项目的一部分。我只是将整个项目迁移到AndroidX。我现在在apilib 上运行检测测试时遇到此错误：

 Task :api:checkDebugAndroidTestDuplicateClasses FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':api:checkDebugAndroidTestDuplicateClasses'.
> 1 exception was raised by workers:
  java.lang.RuntimeException: java.lang.RuntimeException: Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules jetified-guava-25.1-android.jar (com.google.guava:guava:25.1-android) and listenablefuture-1.0.jar (com.google.guava:listenablefuture:1.0)

如果我检查debugAndroidTest变体的运行时类路径：

./gradlew api:dependencies --configuration debugAndroidTestRuntimeClasspath | grep --color -E "guava|$"

我得到这个输出。我可以看到问题：

------------------------------------------------------------
Project :api
------------------------------------------------------------
debugAndroidTestRuntimeClasspath - Resolved configuration for runtime for variant: debugAndroidTest
+--- project :test_utils
|    +--- project :core
...
|    +--- project :api (*)
|    +--- com.google.android.material:material:1.1.0-alpha03
|    |    +--- androidx.annotation:annotation:1.0.1 -> 1.1.0-alpha01
|    |    +--- androidx.appcompat:appcompat:1.1.0-alpha01
|    |    |    +--- androidx.annotation:annotation:1.0.0 -> 1.1.0-alpha01
|    |    |    +--- androidx.core:core:1.1.0-alpha01 -> 1.1.0-alpha03
|    |    |    |    +--- com.google.guava:listenablefuture:1.0 // <------ GUAVA
|    |    |    |    +--- androidx.annotation:annotation:1.0.1 -> 1.1.0-alpha01
...
+--- com.google.truth:truth:0.42
|    +--- com.google.guava:guava:25.1-android / <------ MORE GUAVA
|    |    +--- com.google.code.findbugs:jsr305:3.0.2
|    |    +--- com.google.errorprone:error_prone_annotations:2.1.3 -> 2.3.1
|    |    +--- com.google.j2objc:j2objc-annotations:1.1
|    |    \--- org.codehaus.mojo:animal-sniffer-annotations:1.14
|    +--- org.checkerframework:checker-compat-qual:2.5.3
|    +--- org.checkerframework:checker-qual:2.5.3
|    +--- junit:junit:4.12 (*)
|    +--- com.googlecode.java-diff-utils:diffutils:1.3.0
|    +--- com.google.auto.value:auto-value-annotations:1.6.2
|    \--- com.google.errorprone:error_prone_annotations:2.3.1
...

AndroidX核心取决于新的番石榴的“仅ListableFuture-only”构建，而Truth取决于完整的番石榴25。

我认为我了解了ListenableFuture的潜在问题：https ://groups.google.com/forum/#! topic/ guava-announce/Km82fZG68Sw

什么是正确的解决方案？

我不想将番石榴完全排除在真相之外（否则真相将无法编译）

androidTestImplementation("com.google.truth:truth:0.42") {
    exclude group: 'com.google.guava', module: 'guava'
}

我是否可以通过使其成为第一级依赖项来排除+强制更新到Guava 27：

androidTestImplementation("com.google.truth:truth:$rootProject.ext.truthVersion") {
    exclude group: 'com.google.guava', module: 'guava'
}
// must add guava as top level dependency to force Truth to use latest version
androidTestImplementation 'com.google.guava:guava:27.0.1-android'

如果执行此操作，是否应该使用番石榴的android或JRE版本？

附带问题：

为什么在查看compile类路径时看不到番石榴依赖性？该错误是编译时错误，而不是运行时错误

./gradlew api:dependencies --configuration debugAndroidTestCompileClasspath | grep --color -E "guava|$"

结果部门：

debugAndroidTestCompileClasspath - Resolved configuration for compilation for variant: debugAndroidTest
+--- project :test_utils // <----------- why are test_utils deps not listed here???
...
+--- com.google.truth:truth:0.42
|    +--- com.google.guava:guava:25.1-android <------ GUAVA
|    |    +--- com.google.code.findbugs:jsr305:3.0.2
|    |    +--- org.checkerframework:checker-compat-qual:2.0.0 -> 2.5.3
|    |    +--- com.google.errorprone:error_prone_annotations:2.1.3 -> 2.3.1
|    |    +--- com.google.j2objc:j2objc-annotations:1.1
|    |    \--- org.codehaus.mojo:animal-sniffer-annotations:1.14
|    +--- org.checkerframework:checker-compat-qual:2.5.3
|    +--- org.checkerframework:checker-qual:2.5.3
|    +--- junit:junit:4.12 (*)
|    +--- com.googlecode.java-diff-utils:diffutils:1.3.0
|    +--- com.google.auto.value:auto-value-annotations:1.6.2
|    \--- com.google.errorprone:error_prone_annotations:2.3.1
...
+--- com.google.truth:truth:{strictly 0.42} -> 0.42 (c)
+--- com.google.guava:guava:{strictly 25.1-android} -> 25.1-android (c) // <--------- why is this listed again here at top level?

---

更新：

更新为Truth 0.43之后，我现在看到此错误：

> Could not resolve all artifacts for configuration ':mymodule:debugAndroidTestRuntimeClasspath'.
   > Could not resolve com.google.guava:listenablefuture:{strictly 1.0}.
     Required by:
         project :mymodule
      > Cannot find a version of 'com.google.guava:listenablefuture' that satisfies the version constraints:
           Dependency path 'example:mymodule:unspecified' --> 'com.google.truth:truth:0.43' --> 'com.google.guava:guava:27.0.1-android' --> 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           Dependency path 'example:mymodule:unspecified' --> 'example:myothermodule:unspecified' --> 'andrexampleoidx.core:core:1.1.0-alpha04' --> 'com.google.guava:listenablefuture:1.0'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
            ...
           Dependency path 'example:mymodule:unspecified' --> 'example:myothermodule:unspecified' --> 'androidx.core:core:1.1.0-alpha04' --> 'androidx.concurrent:concurrent-futures:1.0.0-alpha02' --> 'com.google.guava:listenablefuture:1.0'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           ...

   > Could not resolve com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava.
     Required by:
         project :mymodule > com.google.truth:truth:0.43 > com.google.guava:guava:27.0.1-android
      > Cannot find a version of 'com.google.guava:listenablefuture' that satisfies the version constraints:
           Dependency path 'example:mymodule:unspecified' --> 'com.google.truth:truth:0.43' --> 'com.google.guava:guava:27.0.1-android' --> 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           Dependency path 'example:mymodule:unspecified' --> 'example:myothermodule:unspecified' --> 'androidx.core:core:1.1.0-alpha04' --> 'com.google.guava:listenablefuture:1.0'
           ...
           Dependency path 'example:mymodule:unspecified' --> 'example:myothermodule:unspecified' --> 'androidx.core:core:1.1.0-alpha04' --> 'androidx.concurrent:concurrent-futures:1.0.0-alpha02' --> 'com.google.guava:listenablefuture:1.0'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           ...

   > Could not resolve com.google.guava:listenablefuture:1.0.
     Required by:
         project :mymodule > androidx.core:core:1.1.0-alpha04
         project :mymodule > androidx.concurrent:concurrent-futures:1.0.0-alpha02
      > Cannot find a version of 'com.google.guava:listenablefuture' that satisfies the version constraints:
           Dependency path 'example:mymodule:unspecified' --> 'com.google.truth:truth:0.43' --> 'com.google.guava:guava:27.0.1-android' --> 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           ...
           Dependency path 'example:mymodule:unspecified' --> 'example:myothermodule:unspecified' --> 'androidx.core:core:1.1.0-alpha04' --> 'androidx.concurrent:concurrent-futures:1.0.0-alpha02' --> 'com.google.guava:listenablefuture:1.0'
           Constraint path 'example:mymodule:unspecified' --> 'com.google.guava:listenablefuture:{strictly 1.0}' because of the following reason: debugRuntimeClasspath uses version 1.0
           ...

如果我正确理解：

• 真相0.43取决于番石榴27
• Guava 27依赖于9999.0-empty它，因为它内部包含的副本，ListenableFuture而版本9999.0-empty很好是“ empty”。
• 其他类似AndroidX核心的库依赖于 listenablefuture:1.0
• 解决冲突时（我应该使用版本1.0还是9999.0？），Gradle将选择最新版本，在这种情况下为9999.0。
• 因此，AndroidX核心实际上是ListenableFuture通过Guava从类路径中获取的，但这不是最明智的选择。
• 但是，strictly关键字强制使用1.0
• 发生这种情况是因为Android Gradle插件会强制运行时和编译时类路径依赖于相同的版本=（请在此处阅读更多内容

所以此刻，我对现在该做什么感到困惑。

Answer 1

要解决冲突，只需添加对 Guava 27 的依赖就足够了。这样做应该会自动（尽管您链接的帖子中描述的“版本 99 不存在”黑客攻击）可以防止ListenableFuture拉入第二个副本。（如果没有，请告诉我们！）

由于您正在开发 Android 库，因此听起来您想要guava-27.0.1-android而不是-jre.

我对你的附带问题一无所知，抱歉。很抱歉这么长时间没有回应。