Warp: fails when ProxyURLProvider is called more than once per test

java.lang.RuntimeException: Could not lookup value for field private java.net.URL org.richfaces.integration.javascript.ITJavaScriptServiceAjax.contextPath
	at org.jboss.arquillian.test.impl.enricher.resource.ArquillianResourceTestEnricher.enrich(ArquillianResourceTestEnricher.java:61)
	at org.jboss.arquillian.test.impl.TestInstanceEnricher.enrich(TestInstanceEnricher.java:52)
	at org.jboss.arquillian.container.test.impl.ClientTestInstanceEnricher.enrich(ClientTestInstanceEnricher.java:51)
	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 org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	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.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:142)
	at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createBeforeContext(ContainerEventController.java:124)
	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 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 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 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 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 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 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 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.junit.Arquillian$4.evaluate(Arquillian.java:222)
	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.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	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:309)
	at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147)
	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.IllegalStateException: The OperatiocalContext was already set for URL: http://127.0.0.1:18080
	at org.jboss.arquillian.warp.impl.client.proxy.ProxyURLToContextMapping.register(ProxyURLToContextMapping.java:38)
	at org.jboss.arquillian.warp.impl.client.proxy.ClassProxyUsageTracker.registerOperationalContextToUrl(ClassProxyUsageTracker.java:54)
	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 org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94)
	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:135)
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115)
	at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67)
	at org.jboss.arquillian.warp.impl.client.proxy.ProxyURLProvider.getProxyUrl(ProxyURLProvider.java:82)
	at org.jboss.arquillian.warp.impl.client.proxy.ProxyURLProvider.lookup(ProxyURLProvider.java:71)
	at org.jboss.arquillian.test.impl.enricher.resource.ArquillianResourceTestEnricher.lookup(ArquillianResourceTestEnricher.java:112)
	at org.jboss.arquillian.test.impl.enricher.resource.ArquillianResourceTestEnricher.enrich(ArquillianResourceTestEnricher.java:57)
	... 65 more