Supposing, you have in ejb-jar.xml,
<resource-ref>
<res-ref-name>jdbc/UnityDS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
in the sun-ejb-jar.xml, you would have specified :
<resource-ref>
<res-ref-name>jdbc/UnityDS</res-ref-name>
<jndi-name>jdbc/RealmDS</jndi-name>
<default-resource-principal>
<name>someuser</name>
<password>somepassword</password>
</default-resource-principal>
</resource-ref>
The above would do the mapping of your "jdbc/RealmDS" to "jdbc/UnityDS".
Hope this helps,
Shalini.
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