"Test Connection" gives 2 warnings and failure on JBoss EAP5.

Issue

Clicking on the "Test Connection" button in the console states that no connection was made to the data source. I can make a successful connection from the same server to the same data source in EAP 6.1.

WARN  [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] (ResourceContainer.invoker.nonDaemon-1) Throwable while attempting to get a new connection: null
org.jboss.resource.JBossResourceException: No matching credentials in Subject!
        at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:506)
        at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:171)
        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:639)
        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:273)
        at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:689)
        at org.jboss.resource.connectionmanager.JBossManagedConnectionPool.internalTestConnection(JBossManagedConnectionPool.java:347)
        at org.jboss.resource.connectionmanager.JBossManagedConnectionPool.testConnection(JBossManagedConnectionPool.java:401)
        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.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
        at org.jboss.system.server.jmx.LazyMBeanServer.invoke(LazyMBeanServer.java:283)
        at org.jboss.system.microcontainer.ServiceControllerContext.invoke(ServiceControllerContext.java:190)
        at org.jboss.kernel.plugins.registry.basic.LifecycleAwareKernelBus$1.dispatch(LifecycleAwareKernelBus.j