Caused by: java.lang.ClassCastException: com.google.gwt.dom.client.Element$$EnhancerByMockitoWithCGLIB$$57c66b4f cannot be cast to com.google.gwt.user.client.Element

[riyaz47]

Hi i am facing the below exception while using Mockito 1.1.4 for creating junit test case for my GWT class, can some help me fixing it

Exception :

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.google.gwtmockito.GwtMockitoTestRunner.withBefores(GwtMockitoTestRunner.java:326)
at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:261)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at com.google.gwtmockito.GwtMockitoTestRunner.run(GwtMockitoTestRunner.java:307)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
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.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.google.gwtmockito.GwtMockitoTestRunner.withBefores(GwtMockitoTestRunner.java:324)
... 16 more
Caused by: java.lang.ExceptionInInitializerError
at sun.reflect.GeneratedSerializationConstructorAccessor1.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:40)
at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)
at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:56)
at org.mockito.internal.creation.CglibMockMaker.createMock(CglibMockMaker.java:23)
at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:26)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:51)
at org.mockito.Mockito.mock(Mockito.java:1243)
at org.mockito.Mockito.mock(Mockito.java:1120)
at com.google.gwtmockito.GwtMockito.registerGwtMocks(GwtMockito.java:203)
at com.google.gwtmockito.GwtMockito.initMocks(GwtMockito.java:133)
... 21 more
Caused by: java.lang.ClassCastException: com.google.gwt.dom.client.Element$$EnhancerByMockitoWithCGLIB$$57c66b4f cannot be cast to com.google.gwt.user.client.Element
at com.extjs.gxt.ui.client.core.El.isBorderBox(El.java:156)
at com.extjs.gxt.ui.client.GXT.init(GXT.java:317)
at com.extjs.gxt.ui.client.widget.Component.(Component.java:203)
... 35 more

[ckuetbach]

I also had a classcast-issue.

May be this Annotation will help?

@RunWith(GwtMockitoTestRunner.class)
@WithClassesToStub({Element.class})
public class MyGWTTest { ...

[teoDev]

I have the same issue like @riyaz47 , and
@WithClassesToStub({Element.class})
Did not solve this problem.