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Asked: 2026-05-25T23:14:15+00:00

i am writing the junit using easy mock for my program. Below is the

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i am writing the junit using easy mock for my program. Below is the test method 

public static void doBeforeEachTestCase() {

private static FibanocciProg mock;

mock = EasyMock.createMock(FibanocciProg.class);

     FibanocciProg testObject= new FibanocciProg();

    EasyMock.expect(mock.recursionFib1(6)).andReturn(50);
    EasyMock.replay(mock);
    int actual = testObject.recursionFib1(6);

 }

I am getting below error in eclipse while EasyMock.createMock. The libs i have downloaded for easy mock are:- easymock-3.0,cglib-2.2.2,asm-4.0_RC2

Exception in thread "main" java.lang.VerifyError: class net.sf.cglib.core.DebuggingClassWriter overrides final method visit.(IILjava/lang/String;Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;)V
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(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 net.sf.cglib.core.AbstractClassGenerator.<init>(AbstractClassGenerator.java:38)
at net.sf.cglib.core.KeyFactory$Generator.<init>(KeyFactory.java:127)
at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:112)
at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:69)
at org.easymock.internal.ClassProxyFactory.createEnhancer(ClassProxyFactory.java:259)
at org.easymock.internal.ClassProxyFactory.createProxy(ClassProxyFactory.java:174)
at org.easymock.internal.MocksControl.createMock(MocksControl.java:60)
at org.easymock.EasyMock.createMock(EasyMock.java:104)
at TestMock.doBeforeEachTestCase(TestMock.java:19)
at TestMock.main(TestMock.java:13)

Any Pointers?

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1 Answer

  1. Editorial Team

    You have the wrong version of the dependencies for Easymock. Looking at the maven pom for EasyMock 3.0, the dependencies are:

      <dependency>
    <groupId>cglib</groupId>
    <artifactId>cglib-nodep</artifactId>
    <version>2.2</version>
  </dependency>
  <dependency>
    <groupId>org.objenesis</groupId>
    <artifactId>objenesis</artifactId>
    <version>1.2</version>
  </dependency>

    or the EasyMock documentation:

    Requirements

    • EasyMock only works with Java 1.5.0 and above.
    • cglib (2.2) and Objenesis (1.2) must be in the classpath to perform
      class mocking

    So you’re using version 2.2.2 rather than 2.2. java.lang.VerifyError generally happens when you’ve compiled against one library but then are executing against another version of the library.

    See the answers to Reasons of getting a java.lang.VerifyError and the javadoc for java.lang.VerifyError

    Note: to find the above dependency details, you simply need to search on Maven Search.

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