mockito + easymock - NoClassDefFoundError:net/sf/cglib/proxy/Enhancer

I am writing a test using easymock + powermock, the reason I am using powermock is to mock a static method.

my test class looks like:

import static org.powermock.api.easymock.PowerMock.mockStatic; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.Mockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest(StaticTest.class) public class DummyTest { @Test public void testDummy() { mockStatic(StaticTest.class); Mockito.when(StaticTest.testMethod()).thenReturn("hello world"); ........ } 

here is my test dependencies and versions:

 <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-module-junit4</artifactId> <version>1.4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-api-easymock</artifactId> <version>1.4.12</version> <scope>test</scope> </dependency> 

Running the test, I got initializationError as below:

java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Enhancer at org.powermock.api.extension.proxyframework.ProxyFrameworkImpl.isProxy(ProxyFrameworkImpl.java:29) at org.powermock.reflect.internal.WhiteboxImpl.getUnmockedType(WhiteboxImpl.java:1783) at org.powermock.reflect.internal.WhiteboxImpl.getType(WhiteboxImpl.java:2237) at org.powermock.reflect.internal.WhiteboxImpl.setInternalState(WhiteboxImpl.java:327) at org.powermock.reflect.proxyframework.RegisterProxyFramework.registerProxyFramework(RegisterProxyFramework.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:2014) at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:885) at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:859) at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:466) at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.registerProxyframework(AbstractTestSuiteChunkerImpl.java:154) at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.getPowerMockTestListenersLoadedByASpecificClassLoader(AbstractTestSuiteChunkerImpl.java:107) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:144) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:39) at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:217) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:59) at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32) at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:31) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31) at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57) at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57) at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.ClassNotFoundException: net.sf.cglib.proxy.Enhancer at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:143) at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67) at java.lang.ClassLoader.loadClass(Unknown Source) ... 39 more 

has anybody run into this issue before?

5 Answers

You need cglib in your classpath.

Adding cglib dependency in maven solved me initializationError problem for powermock 1.5.5 as mentioned by @Premraj. For 1.4.12 Powermock probably version 2.2.2 of cglib should do it.

<dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>3.1</version> <scope>test</scope> </dependency> 

For me, adding cglib dependency didn't work. I solved the problem using:

<!-- We depend on the EasyMock API but exclude the EasyMock dependency. The reason is that PowerMock Whitebox needs a "org.powermock.reflect.spi.ProxyFramework" implementation in order to work correctly. This implementation is provided by the extension API:s. Since JMock uses CGLib it can reuse the "org.powermock.api.extension.proxyframework.ProxyFrameworkImpl" in the PowerMock EasyMock API. An alternative to depend on this class would be to simply copy the class it into your code (remember that the class must be named org.powermock.api.extension.proxyframework.ProxyFrameworkImpl). --> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-api-easymock</artifactId> <version>${project.version}</version> <scope>test</scope> <exclusions> <exclusion> <groupId>org.easymock</groupId> <artifactId>easymock</artifactId> </exclusion> </exclusions> </dependency> 

as presented here. Note I'm not using easymock (I use mockito instead)

I tried multiple option, finally below dependency worked for me. Should use the higher version of PowerMock and Mockito to work in spring boot application.

Below is the maven dependency:

spring-boot: 2.0.1.RELEASE( contains junit: 4.12 version by default)

` 1.8 2.0.0-beta.5

</properties> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-api-mockito2</artifactId> <version>${powermock-version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-module-junit4</artifactId> <version>${powermock-version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-core</artifactId> <version>${powermock-version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.powermock</groupId> <artifactId>powermock-module-junit4-rule</artifactId> <version>${powermock-version}</version> <scope>test</scope> </dependency>' 

I resolved the same issue after adding below dependencies.

testCompile('org.powermock:powermock-api-mockito2:2.0.0-beta.5') testCompile('org.powermock:powermock-module-junit4:2.0.0-beta.5')