Injection of resource-ref elements without a mapped name fail

The following piece of xml:

<resource-ref>
<res-ref-name>orb</res-ref-name>
<res-type>org.omg.CORBA.ORB</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
<injection-target>
<injection-target-class>MyClass</injection-target-class>
<injection-target-name>orb</injection-target-name>
</injection-target>
</resource-ref>

results in:

javax.ejb.EJBException: java.lang.RuntimeException: Unable to inject jndi dependency: java:comp/ORB into property MyClass.orb: comp not bound