rmock-developer

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

[Michael N. <ny...@ya...>]

Hello. Here is my problem:

I am trying to mock a call in a service class like this:

...
Profile = getAttributeContext().getEntityManager().getProfileById(int id);
...
...

Getting an AttriibuteContext works alright, like so:

AttributeContext ctx = (AttributeContext)intercept(AttributeContext.class, "attributeContext");

But when i set my expectation off the ctx object like so:


ctx.getEntityManager();
modify().returnValue(is.instanceOf(EntityManager.class));
startVerification();
...
...

There's a problem with the call on the mock object: getEntityManager(), precisely the ClassCastException.

If i remove the call to getEntityManager() and even how it should return my EntityManager, it says that no expectation for the call was set! 

So i'm stuck between giving it what it wants and not setting the expectation;

Could you help me out??

Thanks

Michael



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

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

---------- Forwarded message ----------
From: Joakim Ohlrogge <joa...@ag...>
Date: Jan 30, 2007 9:40 PM
Subject: Re: [Rmock-developer] ClassCastException: Why is it occurring?
To: Michael Nyika <ny...@ya...>


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

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

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

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 <ny...@ya...> 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(<generated>)
>
> 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 <joa...@ag...> 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
>
>
>
> ________________________________
> Need a quick answer? Get one in minutes from people who know. Ask your
> question on Yahoo! Answers.
>
>

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
> >
> >
> >
> > ________________________________
> > Need a quick answer? Get one in minutes from people who know. Ask your
> > question on Yahoo! Answers.
> >
> >
>
>
>
> ________________________________
> Need a quick answer? Get one in minutes from people who know. Ask your
> question on Yahoo! Answers.
>
>

Re: [Rmock-developer] ClassCastException: Solved.

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

If you hadn't mentioned coverlipse and I hadn't tried coverlipse
myself I would never have thought about it. I'm happy it works now!

/J

On 1/30/07, Michael Nyika <ny...@ya...> wrote:
> Hey what do you know? It works! It performed just as you said. I uninstalled
> CoverClipse and installed EclEmma (havent used that just yet). I would never
> have guessed the CoverClipse was the problem. Thank you very much for
> helping out.
>
> I hope someone else can benefit from this too. Many thanks again.
>
> Joakim Ohlrogge <joa...@ag...> wrote:
> 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 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()
> > 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.(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 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
> > >
> > >
> > >
> > > ________________________________
> > > Need a quick answer? Get one in minutes from people who know. Ask your
> > > question on Yahoo! Answers.
> > >
> > >
> >
> >
> >
> > ________________________________
> > Need a quick answer? Get one in minutes from people who know. Ask your
> > question on Yahoo! Answers.
> >
> >
>
>
>
> ________________________________
> We won't tell. Get more on shows you hate to love
> (and love to hate): Yahoo! TV's Guilty Pleasures list.
>
>