Attempt to mockito mock any class generates ExceptionInInitializerError

Question

When I run the following code:

public class ActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {     ....     public void testCanCreateMockito() {         List mockedList = Mockito.mock(List.class);     } } 

I get the following exceptions:

java.lang.ExceptionInInitializerError at org.mockito.internal.creation.cglib.ClassImposterizer.createProxyClass(ClassImposterizer.java:95) at org.mockito.internal.creation.cglib.ClassImposterizer.imposterise(ClassImposterizer.java:57) at org.mockito.internal.creation.cglib.ClassImposterizer.imposterise(ClassImposterizer.java:49) at org.mockito.internal.creation.cglib.CglibMockMaker.createMock(CglibMockMaker.java:24) at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:33) at org.mockito.internal.MockitoCore.mock(MockitoCore.java:59) at org.mockito.Mockito.mock(Mockito.java:1285) at org.mockito.Mockito.mock(Mockito.java:1163) at com.acesounderglass.hungertracker.ActivityTest.testCanCreateMockito(ActivityTest.java:60) at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214) at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199) at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176) at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555) at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1837) Caused by: org.mockito.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null at org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:238) at org.mockito.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:117) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:109) at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:105) at org.mockito.cglib.proxy.Enhancer.<clinit>(Enhancer.java:70) ... 23 more Caused by: java.lang.reflect.InvocationTargetException at org.mockito.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:385) at org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:220) ... 28 more Caused by: java.lang.UnsupportedOperationException: can't load this type of class file at java.lang.ClassLoader.defineClass(ClassLoader.java:300) ... 32 more 

This occurs with any class, List was just an easy example. My gradle dependencies are:

dependencies {     compile fileTree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:appcompat-v7:21.0.0'     androidTestCompile "org.mockito:mockito-core:1.+"     androidTestCompile files('libs/dexmaker-mockito-1.0.jar')     androidTestCompile files('libs/dexmaker-1.0.jar') } 

I've upgraded gradle to 1.1, tried using the experimental unit test feature and not, nothing seems to make a difference. What's going on?

Answer 1

I received this error when I was missing the two dexmaker dependencies.

Adding these lines to the app/gradle.build file is working for me.

androidTestCompile 'org.mockito:mockito-core:1.10.19' androidTestCompile 'com.google.dexmaker:dexmaker:1.2' androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2' 

I am also using Android Studio and have found it to be a good idea to restart AS after altering the dependencies.