After I considered your great hints (thank you very much) on setting:
<property name="hibernate.jndi.class">com.sun.appserv.naming.S1ASCtxFactory</property>
<property name="hibernate.jndi.url">iiop://127.0.0.1:3700</property>
Glassfish seems to accept my JNDI setup in hibernate.cfg.xml (see below).
But there is still some trouble left and no connection is established:
There are 2 warnings in my server.log when deploying to Glassfish, which give me the impression that something is still missing:
Hibernate Validator not found: ignoring
InitialContext did not implement EventContext
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<hibernate-configuration>
<session-factory name="hibernateSessionFactory">
<property name="hibernate.jndi.class">com.sun.appserv.naming.S1ASCtxFactory</property>
<property name="hibernate.jndi.url">iiop://127.0.0.1:3700</property>
<property name="hibernate.connection.datasource">jdbc/myDatasource</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
<mapping resource="HTKSpojos/Tab1.hbm.xml"/>
<mapping resource="HTKSpojos/Tabl2.hbm.xml"/>
</session-factory>
</hibernate-configuration>
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