Re: [Rmock-developer] ClassCastException: Why is it occurring?

[Joakim O. <joa...@ag...>]

Oh come to think of it I actuially never got coverlipse to work with
rMock. I think it has to do with some classloading issues with CGLIB
and coverlipse (CGLIB uses a classloader to generate classes
dynamically and I suspect coverlipse uses a classloader to instrument
the code to be run). I started using eclemma instead:
http://www.mountainminds.com/products/eclemma
That works like charm. Try to run the tests without coverlipse and see
if that helps.

Let me know how it goes

/Joakim Ohrogge

On 1/30/07, Michael Nyika <ny...@ya...> wrote:
> Ok, i understand, it is a little hard to tell:
>
> Here's the StackTrace:
> ====================
> keepalive false
> RemoteTestRunner: trying to connect:3363
> start send tree...done send tree - time(ms): 32
> java.lang.ClassCastException
>     at
> com.esri.sln.ss.core.ctx.ApplicationContext$$EnhancerByCGLIB$$1e4df572.getEntityManager(<generated>)
>     at
> test.gov.ct.event.servlet.rs.SelectAttributeByPointRSServletTest.testGetAttributeByPointWithThemeIdStringNotValid(SelectAttributeByPointRSServletTest.java:41)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:324)
>     at junit.framework.TestCase.runTest(TestCase.java:154)
>     at
> com.agical.rmock.extension.junit.RMockTestCase.runBare(RMockTestCase.java:102)
>     at
> junit.framework.TestResult$1.protect(TestResult.java:106)
>     at
> junit.framework.TestResult.runProtected(TestResult.java:124)
>     at junit.framework.TestResult.run(TestResult.java:109)
>     at junit.framework.TestCase.run(TestCase.java:118)
>     at
> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
>     at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>     at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
>     at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
>     at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
>     at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>     at
> de.uka.ipd.coverage.plugin.remote.CoverageRemoteTestRunner.run(CoverageRemoteTestRunner.java:71)
>     at
> de.uka.ipd.coverage.plugin.remote.CoverageRemoteTestRunner.<init>(CoverageRemoteTestRunner.java:37)
>     at
> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>     at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>     at
> java.lang.reflect.Constructor.newInstance(Constructor.java:274)
>     at
> de.uka.ipd.coverage.plugin.remote.CoverageRemoteTestRunner.main(CoverageRemoteTestRunner.java:48)
>
> ====================
>
> **Dont worry about the RemoteTestRunner bit, that's output from CoverClipse
> (code coverage plugin for eclipse)
>
> I do not have the source code for the methods in the ApplicationContext
> class. It comes from a proprietary API.
>
> If the stacktrace isn't enough, would you at least suspect there are other
> calls of a non-trivial nature inside the getEntityManager() method? Do you
> think the results would be any different if I didn't mock out the interface,
> but created my own EntityManager mock object with fake methods and tried
> that out?
>
> See, RMock is great, but if I could just get past this, i'd be able to mock
> and test anything. Wish it could be so.
>
> Joakim Ohlrogge <joa...@ag...> wrote:
> I would need to see the complete exception with stacktrace and the
> definition of the getEntityManager method to be able to help out
> further. I can't see anything obviously wrong with what you're doing
> with the information I have right now. I'm not aware of any bugs in
> this area that would cause this...
>
> On 1/30/07, Michael Nyika wrote:
> > Thanks for replying Joakim: It seems I still have a problem, the exact
> same
> > error pops up (ClassCastException):
> >
> > Here's my exact setup in code:
> > =======================
> > applicationContext =
> (ApplicationContext)intercept(ApplicationContext.class,
> > "applicationContext");
> >
> > applicationContext.getEntityManager();
> > EntityManager manager = (EntityManager)mock(EntityManager.class,
> > "mockManager");
> >
> > modify().returnValue(manager);
> > startVerification();
> >
> >
> > And the Error is still:
> > ==================
> > java.lang.ClassCastException
> > at
> >
> com.esri.sln.ss.core.ctx.ApplicationContext$$EnhancerByCGLIB$$1e4df572.getEntityManager()
> >
> > Also note that EntityManager is an Interface, but that's no problem with
> the
> > way i've mocked it out. There's a ton of abstract methods i'd rather not
> > quickly implement from the interface, so i'd prefer to mock it out......
> >
> >
> >
> >
> > Joakim Ohlrogge wrote:
> > It took me a little while to spot the problem:
> >
> >
> > Here you are saying:
> >
> > >
> > > ctx.getEntityManager();
> >
> > * expect that ctx.getEntityManager() is called
> > - once
> > - return null (or if EntityManager is an interface, a mocked entity
> manager)
> >
> > > modify().returnValue(is.instanceOf(EntityManager.class));
> >
> > Here you are changing the recorded expectation to return an instance
> > of InstanceOfConstraint primed with EntityManager.class. This gives a
> > class cast exception since what you should be returning is an instance
> > of an EntityManager.
> >
> > What you want to do here to fix it is:
> >
> > EntityManager entityManager = new EntityManager(); // or a mock if you
> > prefer
> > modify().returnValue(entityManager);
> >
> > I hope this helps some.
> > Regards Joakim Ohlrogge
> >
> >
> >
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