calling a @Begin method fails with "java.lang.IllegalArgumentException: Stack must not be null"

org.jboss.seam.InstantiationException: Could not instantiate Seam component: game
	at org.jboss.seam.Component.newInstance(Component.java:2170)
	at org.jboss.seam.Component.getInstance(Component.java:2024)
	at org.jboss.seam.Component.getInstance(Component.java:1986)
	at org.jboss.seam.Component.getInstance(Component.java:1980)
	at org.jboss.seam.Component.getInstance(Component.java:1960)
	at org.jboss.seam.Component.getInstance(Component.java:1955)
	at org.jboss.seam.example.numberguess.test.DroolsNumberGuessTest.testNumberGuessWin(DroolsNumberGuessTest.java:49)
	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:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:270)
	at org.jboss.arquillian.container.test.impl.execution.LocalTestExecuter.execute(LocalTestExecuter.java:60)
	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:597)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
	at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:134)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:114)
	at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67)
	at org.jboss.arquillian.container.test.impl.execution.ContainerTestExecuter.execute(ContainerTestExecuter.java:38)
	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:597)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
	at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81)
	at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89)
	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:597)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75)
	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:597)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60)
	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:597)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:134)
	at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111)
	at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:263)
	at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:226)
	at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314)
	at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46)
	at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:240)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	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.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:185)
	at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314)
	at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46)
	at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:199)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
	at org.jboss.arquillian.junit.container.JUnitTestRunner.execute(JUnitTestRunner.java:65)
	at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.executeTest(ServletTestRunner.java:160)
	at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.execute(ServletTestRunner.java:126)
	at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.doGet(ServletTestRunner.java:90)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
	at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
	at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
	at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
	at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
	at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
	at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalArgumentException: Stack must not be null
	at org.jboss.seam.core.ConversationEntry.<init>(ConversationEntry.java:45)
	at org.jboss.seam.core.ConversationEntries.createConversationEntry(ConversationEntries.java:53)
	at org.jboss.seam.core.Manager.createConversationEntry(Manager.java:667)
	at org.jboss.seam.core.Manager.beginConversation(Manager.java:688)
	at org.jboss.seam.core.ConversationInterceptor.beginConversation(ConversationInterceptor.java:229)
	at org.jboss.seam.core.ConversationInterceptor.beginConversationIfNecessary(ConversationInterceptor.java:166)
	at org.jboss.seam.core.ConversationInterceptor.aroundInvoke(ConversationInterceptor.java:57)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.bpm.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:51)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
	at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185)
	at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
	at org.jboss.seam.example.numberguess.Game_$$_javassist_seam_2.begin(Game_$$_javassist_seam_2.java)
	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:597)
	at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
	at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144)
	at org.jboss.seam.Component.callComponentMethod(Component.java:2275)
	at org.jboss.seam.Component.callCreateMethod(Component.java:2198)
	at org.jboss.seam.Component.newInstance(Component.java:2158)
	... 110 more

   @Test
   public void testNumberGuessWin() throws Exception
   {     
      Game game = (Game) Component.getInstance(Game.class);
   }