的Android瓦特/科特林純Java-的Junit NoClassDefFoundError的解決方法不工作

Question

Repository that reliably reproduces the error: explodes/bug-kotlin-junit

我的Android應用由一個應用模塊和4個的庫模塊。

我的測試是用純Java編寫的。測試不碰科特林代碼運行得很好，但是當我運行使用（MyKotlinObj::methodRef）測試或inits類（new MyKotlinObj()），我的測試將失敗，出現以下：

java.lang.NoClassDefFoundError: com/explod/api/UserCreated 

    at com.explod.api.Bug.initUserCreated_shouldNotTriggerNoClassDefFoundError(Bug.java:19) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) 
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51) 
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) 
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131) 
Caused by: java.lang.ClassNotFoundException: com.explod.api.UserCreated 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
    ... 28 more 

使用：

• 的Android 3.0工作室金絲雀2

• 構建工具26.0.0-RC2

• 科特林版本1.1.2 -4

• Android的搖籃插件3.0.0-α-2

• 的gradle搖籃-4.0-里程碑-1

• 目標SDK 25

• 敏SDK 19

解決方法建議here不適用於我：

android { 
    task copyTestClasses(type: Copy) { 
     from "build/tmp/kotlin-classes/debugUnitTest" 
     into "build/intermediates/classes/debug" 
    } 

它看起來像Android Studio team possibly has a solution但我希望有一個可行的解決方法。我的問題不同嗎？我的測試中沒有Kotlin代碼。

Answer 1

原來，該解決方法的目標複製目錄不正確。

我一直在使用：

task copyTestClasses(type: Copy) { 
    from "build/tmp/kotlin-classes/devDebugUnitTest" 
    into "build/intermediates/classes/devDebug" 
} 

task copySdkClasses(type: Copy) { 
    from "build/tmp/kotlin-classes/devDebug" 
    into "build/intermediates/classes/dev/debug" 
} 

但對我來說了以下工作：

task copyTestClasses(type: Copy) { 
    from "build/tmp/kotlin-classes/devDebugUnitTest" 
    into "build/intermediates/classes/dev/debug" 
} 

task copySdkClasses(type: Copy) { 
    from "build/tmp/kotlin-classes/devDebug" 
    into "build/intermediates/classes/dev/debug" 
} 

乾淨的構建，該SDK類不可用。我還需要將:api:assembleDevDebug添加到運行配置中，以使其從乾淨版本開始工作。