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Help needed for setting JMock

Pradeep Kumar
Ranch Hand

Joined: Sep 08, 2006
Posts: 108

I am new to test with Jmock. When i run the test case i get this exception stack trace. I am using the following library dependencies.

1. hamcrest-core-1.1.jar
2. hamcrest-library-1.1.jar
3. jmock-2.5.1.jar
4. jmock-junit4-2.5.1.jar
5. junit-4.4.jar

The Test class is wrote is below.

The class to be tested is a simple java class.

And finally when i run in eclipse the stack trace is as follows

java.lang.IllegalArgumentException: com.local.domain.DependentClass1 is not an interface
at java.lang.reflect.Proxy.getProxyClass(Unknown Source)
at java.lang.reflect.Proxy.newProxyInstance(Unknown Source)
at org.jmock.lib.JavaReflectionImposteriser.imposterise(
at org.jmock.Mockery.mock(
at org.jmock.Mockery.mock(
at com.test.domain.TestJMock.testJMockSetUp(
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.junit.internal.runners.TestMethod.invoke(
at org.jmock.integration.junit4.JMock$1.invoke(
at org.junit.internal.runners.MethodRoadie.runTestMethod(
at org.junit.internal.runners.MethodRoadie$
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(
at org.junit.internal.runners.MethodRoadie.runTest(
at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(
at org.junit.internal.runners.JUnit4ClassRunner.runMethods(
at org.junit.internal.runners.JUnit4ClassRunner$
at org.junit.internal.runners.ClassRoadie.runUnprotected(
at org.junit.internal.runners.ClassRoadie.runProtected(
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(

Kindly let me know where i went wrong.

Thanks and Regards,

Thanks and Regards, Pradeep Kumar
SCJP 1.6, SCWCD 5.0
Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 32819

The error message is a big clue. It's telling you that you are trying to mock a regular class and not an interface. Try creating an interface for the class.

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Eric Botorlian

Joined: Sep 05, 2009
Posts: 2
I'm facing the same issue. I would consider it a bug or configuration issue as it's my impression that JMock can mock both concrete classes and interfaces.

Post here if you find a solution, Pradeep!

Eric Botorlian

Joined: Sep 05, 2009
Posts: 2
This should help. It's an instruction on mocking concrete and abstract classes.
I agree. Here's the link:
subject: Help needed for setting JMock
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