Arquillian Spock test fails with NPE when a subclass of spock.lang.Specification is used

 
abstract class MySpecification extends spock.lang.Specification{
}

 
@ArquillianSpecification
class SpockSpecSubclassIt extends MySpecification {
   @Deployment
   static WebArchive deployment() {
      ShrinkWrap.create( WebArchive.class )
   }

   void 'test'() {
      expect:
         'foo' != 'bar'
   }
}

java.lang.NullPointerException
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.lookup(ContainerEventController.java:164)
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:146)
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createBeforeContext(ContainerEventController.java:124)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115)
	at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.before(EventTestRunnerAdaptor.java:95)
	at org.jboss.arquillian.spock.ArquillianInterceptor.interceptSetupMethod(ArquillianInterceptor.java:77)
	at org.spockframework.runtime.extension.AbstractMethodInterceptor.intercept(AbstractMethodInterceptor.java:28)
	at org.spockframework.runtime.extension.MethodInvocation.proceed(MethodInvocation.java:84)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	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)

java.lang.NullPointerException
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.lookup(ContainerEventController.java:164)
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:146)
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createAfterContext(ContainerEventController.java:134)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60)
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115)
	at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.after(EventTestRunnerAdaptor.java:103)
	at org.jboss.arquillian.spock.ArquillianInterceptor.interceptCleanupMethod(ArquillianInterceptor.java:89)
	at org.spockframework.runtime.extension.AbstractMethodInterceptor.intercept(AbstractMethodInterceptor.java:31)
	at org.spockframework.runtime.extension.MethodInvocation.proceed(MethodInvocation.java:84)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	at org.spockframework.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:138)
	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)