@Resource does not inject simple environment entries

Given:

<!-- Override the one-way hash MessageDigest algorithm -->
<env-entry>
<env-entry-name>messageDigestAlgorithm</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>SHA</env-entry-value>
</env-entry>

All that should be required for injection is @Resource upon a field of same name within the bean class:

@Resource
private String messageDigestAlgorithm;

Spec 16.4.1.1:

The Bean Provider uses the Resource annotation to annotate a field or method of the bean class as a
target for the injection of a simple environment entry. The name of the environment entry is as described
in Section 16.2.2; the type is as described in Section 16.4.

WARN message in logs is:

17:37:00,963 WARN [ResourceHandler] Not injecting messageDigestAlgorithm, no matching enc injector env/org.jboss.ejb3.examples.ch05.encryption.EncryptionBean/messageDigestAlgorithm found

ENC is:

+- EJBContext (class: javax.ejb.EJBContext)
+- TransactionSynchronizationRegistry[link -> java:TransactionSynchronizationRegistry] (class: javax.naming.LinkRef)
+- UserTransaction (class: org.jboss.ejb3.tx.UserTransactionImpl)
+- env (class: org.jnp.interfaces.NamingContext)