android - 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.