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Conditional dependencies in manifest? [message #119814]

Mon, 20 October 2008 17:46

Chris W

Messages: 33
Registered: July 2009

Member

We need to handle our log4j dependency for 3.2.2 and 3.3+. The Eclipse
SDKs are different for lo4gj - 3.2 comes with (or via WST) bundle
"org.apache.jakarta_log4j" whereas 3.3+ with "org.apache.log4j". To avoid
additional install steps for our product, our thinking was employing some
sort of conditional dependency in our bundle manifest: if not
"org.apache.log4j", then "org.apache.jakarta_log4j".

I don't see conditional dependencies for OSGi, although ideas have been
propose. I don't see how "optional" would work given that we have a hard
dependency on Log4j.

Is this possible? Another option?

Thanks.

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Re: Conditional dependencies in manifest? [message #119827 is a reply to message #119814]

Mon, 20 October 2008 17:57

Simon Kaegi

Messages: 381
Registered: July 2009

Senior Member

I'd manage the dependency using Import-Package instead of Require-Bundle,
that way you don't care which bundle is installed and giving you the various
log4j packages. If that's what you're doing already can you give a bit more
detail.

-Simon
"Chris W" <chris@firestruck.com> wrote in message
news:f18abc5b6a411dc1c013d31af03f200e$1@www.eclipse.org...
> We need to handle our log4j dependency for 3.2.2 and 3.3+. The Eclipse
> SDKs are different for lo4gj - 3.2 comes with (or via WST) bundle
> "org.apache.jakarta_log4j" whereas 3.3+ with "org.apache.log4j". To avoid
> additional install steps for our product, our thinking was employing some
> sort of conditional dependency in our bundle manifest: if not
> "org.apache.log4j", then "org.apache.jakarta_log4j".
>
> I don't see conditional dependencies for OSGi, although ideas have been
> propose. I don't see how "optional" would work given that we have a hard
> dependency on Log4j.
>
> Is this possible? Another option?
>
> Thanks.
>

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Re: Conditional dependencies in manifest? [message #119853 is a reply to message #119827]

Tue, 21 October 2008 00:28

Chris W

Messages: 33
Registered: July 2009

Member

Thanks Simon.

I believe that would work, but, what I left out, is that we have our own
appender and also log to Eclipse's log, see we require a buddy connection.
Could I import "org.apache.log4j" and have two separate buddy entries -
one for "org.apache.log4j" and the other for "org.apache.jakarta_log4j"?

Eclipse-RegisterBuddy: org.apache.log4j

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Re: Conditional dependencies in manifest? [message #119879 is a reply to message #119853]

Tue, 21 October 2008 16:48

Eclipse User

Originally posted by: ekkehard.gentz-software.de

Chris W schrieb:
> Thanks Simon.
>
> I believe that would work, but, what I left out, is that we have our own
> appender and also log to Eclipse's log, see we require a buddy
> connection. Could I import "org.apache.log4j" and have two separate
> buddy entries - one for "org.apache.log4j" and the other for
> "org.apache.jakarta_log4j"?
>
> Eclipse-RegisterBuddy: org.apache.log4j
>
as Simon says,
you should use package-import
and your appender should work without buddy,
try a Fragment Bundle - I'm using a Fragment Bundle per ex. to make
extensions of LogBack classes which should be similar to Log4J

you should use Buddys only if there's no other standard
osgi way to solve the requirement

BTW: I'll report exactly about these Fragment bundles in my next blog
about "Logging in OSGI Enterprise apps" (http://ekkes-corner.org)

ekke

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