Resource Adapter fails to deploy with IJ020060: Unable to inject: ... property: hostname value ... in JBoss EAP 6.4

Issue

• IBM MQ Resource Adapter fails to deploy in JBoss EAP 6.4 with this exception:

Caused by: org.jboss.jca.deployers.common.DeployException: IJ020060: Unable to inject: com.ibm.mq.connector.outbound.ManagedConnectionFactoryImpl property: hostname value: 127.0.0.1
  at org.jboss.jca.deployers.common.AbstractResourceAdapterDeployer.createObjectsAndInjectValue(AbstractResourceAdapterDeployer.java:1971) [ironjacamar-deployers-common-1.0.31.Final-redhat-1.jar:1.0.31.Final-redhat-1]
  at org.jboss.as.connector.services.resourceadapters.deployment.ResourceAdapterXmlDeploymentService$AS7RaXmlDeployer.doDeploy(ResourceAdapterXmlDeploymentService.java:185) [jboss-as-connector-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
  at org.jboss.as.connector.services.resourceadapters.deployment.ResourceAdapterXmlDeploymentService.start(ResourceAdapterXmlDeploymentService.java:106) [jboss-as-connector-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
...

Our resource adapter has this definition:

                <resource-adapter id="wmq.jmsra.rar">
                    ...
                    <connection-definitions>
                        <connection-definition class-name="com.ibm.mq.connector.outbound.ManagedConnectionFactoryImpl" jndi-name="java:jboss/MQCF" pool-name="MQCF">
                            <config-property name="hostname">
                                127.0.0.1
                            </config-property>
                            ...