Connect using HOSTNAME adapter with DNSalias

Hi everyone
I am trying to test hostname naming method with Instant Client and DNS aliases. According to docs I should be able to:
- on database TEST: add 'testdb.domain.com' to SERVICE_NAMES parameter
- in DNS: create an Alias named "testdb.domain.com" which points to the server where database TEST is running
- on client mypc.domain.com: connect e.g. with: "sqlplus user/[email protected]" or even "sqlplus user/pass@testdb" since it is in the same domain.
So far so good. With Instant Client 10.2.0.4.0 this works just fine. But if I try with Instant Client 11.1.0.6.0, I instead get the following error message:
ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA
With a trace, I found out that Instant Client 10.2.0.4.0 converts the string "testdb.domain.com" into the connect string "(DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=testdb.domain.com))(ADDRESS=(PROTOCOL=TCP)(HOST=1.2.3.4)(PORT=1521)))" after switching to the hostname adapter.
Instant Client 11.1.0.6.0 converts the same string "testdb.domain.com" into the following connect string: "(DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=1.2.3.4)(PORT=1521)))" after switching to the hostname adapter.
==> So it is no wonder the listener complains about a missing service_name if the parameter is present in connect_data but with an empty value!
btw.: setting DEFAULT_SERVICE_listener on the server side didn't help and wouldn't be an option anyway.
Does anyone know why this happens? Any ideas on how to fix it?
I would be grateful for any help...
Regards
Urs

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To access any database fromm XI, using the JDBC adapter, the corresponding drivers have to be installed on the XI server.
Just check this note 831162.
Also, check this PDF to install Drivers in XI,
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3867a582-0401-0010-6cbf-9644e49f1a10

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