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Fri, 21 May 2010 10:55

Eclipse User

Hi
When will the new version of SLF4j be available on orbit? If it helps I could contribute it (although I'm no contributer to orbit).

Thanks and greetings
Stephan Leicht

Re: SLF4j Version 1.6.0 [message #565671 is a reply to message #565609]

Sat, 22 May 2010 16:35

Eclipse User

Stephan Leicht wrote:
> Hi
> When will the new version of SLF4j be available on orbit? If it helps I
> could contribute it (although I'm no contributer to orbit).
>
> Thanks and greetings
> Stephan Leicht
>

Probably not until (at least) July, as we are stabizing now for June
release. You could as on orbit-dev list, and probably get a more direct
answer from those who contributed version 1.5.11 and others.

Re: SLF4j Version 1.6.0 [message #565977 is a reply to message #565609]

Wed, 21 July 2010 01:49

Eclipse User

Hi Stephan,

Am 21.05.2010 16:55, schrieb Stephan Leicht:
> When will the new version of SLF4j be available on orbit?

As soon as there is a CQ we can add it. Did you open one already?

-Gunnar

--
Gunnar Wagenknecht
gunnar@wagenknecht.org
http://wagenknecht.org/

Re: SLF4j Version 1.6.0 [message #645503 is a reply to message #565609]

Fri, 17 December 2010 09:18

Eclipse User

I have a dependency problem with org.slf4j.api_1.6.1 !

[Orbit CQ:4408]
( http://download.eclipse.org/tools/orbit/downloads/drops/S201 01204061544/)

My Plugin depends on org.slf4j.api_1.6.1 an provides the Class "org.slf4j.impl.StaticLoggerBinder". Eclipse detects an a validation problem :
"Missing Constraint: Eclipse-GenericRequire:org.slf4j.impl.StaticLoggerBinder: (&(version>=1.6.0)(!(version>=1.7.0)))".

My Plugin export the package of my StaticLoggerBinder-class like this:
Export-Package: org.slf4j.impl;version="1.6.1";uses:="org.slf4j.spi,org.slf4j.helpers,org.slf4j "

I think here is a dependency cycle. The bundle org.slf4j.api require my "org.slf4j.impl.StaticLoggerBinder" implementation and i depend on the slf4j-bundle.

When i remove the follwing from the MANIFEST.MF everything is fine:
"Eclipse-GenericRequire: org.slf4j.impl.StaticLoggerBinder;selection-filter=(&(ve rsion >=1.6.0)(!(version>=1.7.0))))"

Btw. slf4j_1.5.11 does not have this statement.

How can i fix this Problem ?

Re: SLF4j Version 1.6.0 [message #646214 is a reply to message #645503]

Wed, 22 December 2010 12:16

Eclipse User

I think there's a valid reason why Orbit's SLF4J is like that.

SLF4J API is "useless" when only itself is installed by p2 (in an Eclipse installation), therefore it requires another bundle (the implementation) to be installed.

In your case, I would suggest using the original SLF4J API bundle from SLF4J, not from Orbit.

You could also try marking your Import-Package of slf4j API as optional.

I guess this is probably a bug, though I'm not sure what is the best way due to SLF4J architecture. Perhaps someone from SLF4J has a better idea how it should be done.

Re: SLF4j Version 1.6.0 [message #646481 is a reply to message #645503]

Fri, 24 December 2010 14:16

Eclipse User

Hi,

Am 17.12.2010 15:18, schrieb Chris:
> My Plugin depends on org.slf4j.api_1.6.1 an provides the Class "org.slf4j.impl.StaticLoggerBinder". Eclipse detects an a validation problem :
> "Missing Constraint: Eclipse-GenericRequire:org.slf4j.impl.StaticLoggerBinder: (&(version>=1.6.0)(!(version>=1.7.0)))".

> How can i fix this Problem ?

Sorry for the late reply but I haven't seen the message until just now.
For a detailed explanation of the bundles please have a look at the
README in CVS.

http://dev.eclipse.org/viewcvs/viewvc.cgi/org.eclipse.orbit/ org.slf4j.api/readme-bundles.txt?view=co&root=Tools_Proj ect&pathrev=v1_6_1

Basically, if you want to provide your own SLF4J implementation you need
to create a fragement to slf4j.api bundle. In this fragment you also
need to specify an additional manifest header. This ensures that logging
is actually possible at runtime.

The limitation with the Eclipse-GenericRequire/GenericCapability header
was put in place in order to fix an issue with SLF4J 1.5.x in Helios.
Basically SLF4J was failing horribly when no implementation was around.
They changed it in 1.6. Thus, we might be able to remove that again.
Feel free to open a bug in order to request that removal.

-Gunnar

--
Gunnar Wagenknecht
gunnar@wagenknecht.org
http://wagenknecht.org/

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