beans.xml hides JNDI name "java:jboss/UserTransaction"

I'm using JBoss AS 7.1.0 Jenkins build 1466 which provides the JNDI name "java:jboss/UserTransaction" for the UserTransaction object as a resource. However, as soon as I add an empty beans.xml for CDI/Weld, I get a stacktrace as shown below. I'll attach a testcase.

Stacktrace:
Aug 03, 2011 11:21:35 AM org.jboss.arquillian.protocol.jmx.JMXMethodExecutor invoke
ERROR: Failed: testcase.CustomerTest.findCustomerById
java.lang.RuntimeException: Could not inject members
at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.injectClass(CDIInjectionEnricher.java:135)
at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.enrich(CDIInjectionEnricher.java:78)
at org.jboss.arquillian.test.impl.TestInstanceEnricher.enrich(TestInstanceEnricher.java:52)
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:601)
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:82)
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:601)
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:68)
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:601)
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: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:601)
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.core.impl.ManagerImpl.fire(ManagerImpl.java:114)
at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.before(EventTestRunnerAdaptor.java:95)
at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:198)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:290)
at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:45)
at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:216)
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:161)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:290)
at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:45)
at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:175)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:123)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at org.jboss.arquillian.junit.container.JUnitTestRunner.execute(JUnitTestRunner.java:65)
at org.jboss.arquillian.protocol.jmx.JMXTestRunner.runTestMethodInternal(JMXTestRunner.java:152)
at org.jboss.arquillian.protocol.jmx.JMXTestRunner.runTestMethodRemote(JMXTestRunner.java:112)
at org.jboss.as.arquillian.service.ArquillianService$ExtendedJMXTestRunner.runTestMethodRemote(ArquillianService.java:205)
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:601)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:111)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:45)
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:235)
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:250)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:791)
at org.jboss.as.jmx.tcl.TcclMBeanServer.invoke(TcclMBeanServer.java:214)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1447)
at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:89)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1292)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1380)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:812)
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:601)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at sun.rmi.transport.Transport$1.run(Transport.java:174)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.RuntimeException: Error looking up java:comp/UserTransaction in JNDI
at org.jboss.weld.injection.spi.helpers.AbstractResourceServices.resolveResource(AbstractResourceServices.java:51)
at org.jboss.weld.util.Beans.injectEEFields(Beans.java:798)
at org.jboss.weld.manager.SimpleInjectionTarget$1.proceed(SimpleInjectionTarget.java:119)
at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:54)
at org.jboss.weld.manager.SimpleInjectionTarget.inject(SimpleInjectionTarget.java:114)
at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.injectNonContextualInstance(CDIInjectionEnricher.java:145)
at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.injectClass(CDIInjectionEnricher.java:125)
... 89 more
Caused by: javax.naming.NameNotFoundException: Name 'UserTransaction' not found in context ''
at org.jboss.as.naming.util.NamingUtils.nameNotFoundException(NamingUtils.java:109)
at org.jboss.as.naming.InMemoryNamingStore$NodeTraversingVisitor.visit(InMemoryNamingStore.java:368)
at org.jboss.as.naming.InMemoryNamingStore$ContextNode.accept(InMemoryNamingStore.java:307)
at org.jboss.as.naming.InMemoryNamingStore.lookup(InMemoryNamingStore.java:162)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:173)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:176)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:207)
at javax.naming.InitialContext.lookup(InitialContext.java:411)
at org.jboss.weld.injection.spi.helpers.AbstractResourceServices.resolveResource(AbstractResourceServices.java:47)
... 95 more