【Android编译错误解决】jetified-objenesis D8 MethodHandle.invokeExact only supported starting with Android O_methodhandle.invoke and methodhandle.invokeexact a

编译错误解决

报错信息

jetified-objenesis-3.0.1.jar: D8: com.android.tools.r8.internal.n1: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)

Failed to transform objenesis-3.0.1.jar (org.objenesis:objenesis:3.0.1) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-is-debuggable=true, dexing-min-sdk=23, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
      > Execution failed for DexingWithClasspathTransform: 6edd45f2900e2313d0b955213ddd0e2c\transformed\jetified-objenesis-3.0.1.jar.
         > Error while dexing.
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原因及解决方案

原因

在项目中引入了 mockito，powermock 等测试库，如下：

    // Optional -- Mockito framework
    implementation 'org.mockito:mockito-core:3.3.3'
    // https://mvnrepository.com/artifact/org.powermock/powermock-api-mockito2
    implementation group: 'org.powermock', name: 'powermock-api-mockito2', version: '2.0.9'
    implementation group: 'org.powermock', name: 'powermock-module-junit4', version: '2.0.9'
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而 mockito-core 依赖了 org.objenesis:objenesis (通过 https://search.maven.org/artifact/org.mockito/mockito-core/4.5.1/jar 进行确认） ，Objenesis 是一个用于绕过构造器创建对象的库，其中使用到了 MethodHandle.invokeExact 方法，而android是在26才引入了 MethodHandle 类的（可参考 android官方文档-java/lang/invoke/MethodHandle ,其上有注明： Added in API level 26MethodHandle。

关于Objenesis 的介绍可参考： https://blog.csdn.net/top_code/article/details/52964854

解决

因为我们这个模块之所以引入mockito-core 是为了提供给测试模块一些基本封装的功能，而实际上被测试模块会通过 androidTestimplementation 来引入mockito及powermock的依赖，且编译及运行测试模块不会有问题。所以我们只需要把这个基础库模块依赖方式 implementation 替换为 compileOnly 即可：

    // Optional -- Mockito framework
    compileOnly 'org.mockito:mockito-core:3.3.3'
    // https://mvnrepository.com/artifact/org.powermock/powermock-api-mockito2
    compileOnly group: 'org.powermock', name: 'powermock-api-mockito2', version: '2.0.9'
    compileOnly group: 'org.powermock', name: 'powermock-module-junit4', version: '2.0.9'
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