Problem Oscar -> Felix

[Vincent Coupe <cu...@hotmail.com>]

Hi!
First, i am french, so i speak a bad english , sorry !

Then i got a big problem with Felix!
I have an application which works on Oscar! but if i want to use it in 
Felix, i got lot of errors :(
I think its a problem of manifest but please help me !!

MANIFEST is :
Manifest-Version: 1.0
Bundle-Name: Bundle Video Client
Bundle-Activator: activator.Activator
Import-Service: demandeVideo.InterfaceTransfertVideo
Bundle-Version: 1.0
DynamicImport-Package: demandeVideo, org.osgi.framework; 
specification-version=1.1


To use on felix, i added
Bundle-ManifestVersion: 2
Bundle-SymbolicName: bundlevideoclient

But i got error :
-> Exception in thread "Thread-3" java.lang.ClassCastException: 
InterfaceFournisseurVideoImpl.InterfaceTransfertVideoImp
l
        at 
activator.Activator$ThreadSelectionAffichage.run(Activator.java:611)

Thanks for your help ! :)
Vincent.

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Re: Problem Oscar -> Felix

["Richard S. Hall" <he...@ungoverned.org>]

Hello Vincent,

> First, i am french, so i speak a bad english , sorry !

Don't worry, I have a lot of experience in this area... ;-)

> Then i got a big problem with Felix!
> I have an application which works on Oscar! but if i want to use it in 
> Felix, i got lot of errors :(
> I think its a problem of manifest but please help me !!
>
> MANIFEST is :
> Manifest-Version: 1.0
> Bundle-Name: Bundle Video Client
> Bundle-Activator: activator.Activator
> Import-Service: demandeVideo.InterfaceTransfertVideo
> Bundle-Version: 1.0
> DynamicImport-Package: demandeVideo, org.osgi.framework; 
> specification-version=1.1

Definitely, as Niclas said, you want to do "Import-Package: 
org.osgi.framework..."...

> To use on felix, i added
> Bundle-ManifestVersion: 2
> Bundle-SymbolicName: bundlevideoclient
>
> But i got error :
> -> Exception in thread "Thread-3" java.lang.ClassCastException: 
> InterfaceFournisseurVideoImpl.InterfaceTransfertVideoImp
> l
>        at 
> activator.Activator$ThreadSelectionAffichage.run(Activator.java:611)
>
> Thanks for your help ! :)

And also as Niclas said, this is not enough information for me to figure 
it out.

Typically speaking, the main differences that impact bundles when switch 
from Oscar to Felix are:

   1. Your bundles must import every external package they use except
      java.* in Felix.
   2. Classes on the class path are no longer automatically accessible
      to the bundles.

Admittedly, these two issues are related.

My guess is that you are falling victim of (2). You probably didn't get 
your class cast exception under Oscar because your classes were also 
available on the class path so your bundles were always getting the same 
definition via the parent class loader. If that were true, then this 
would no longer be the case under Felix.

Of course, this is just a guess.

Investigate a little more. Make sure that all bundles have contain the 
packages they should and make sure that all imports and exports are 
explicit. If you still cannot figure it out, you can email me 
(privately) a minimal set of bundles to reproduce the issue.

-> richard

Re: Problem Oscar -> Felix

[Niclas Hedhman <ni...@hedhman.org>]

On Monday 04 June 2007 17:30, Vincent Coupe wrote:
> Import-Service: demandeVideo.InterfaceTransfertVideo

Very unlikely that you will need this. If you are not sure that you need it, 
take it away.

> DynamicImport-Package: demandeVideo, org.osgi.framework;
> specification-version=1.1

DynamicImport is only recommended for special case, and I suspect that you 
would do just fine with Import-Package instead. No matter, org.osgi.framework 
should always be imported via Import-Package and not dynamic package.

> Bundle-ManifestVersion: 2

When you do this, you trigger all the requirements of R4 Manifests.

> Bundle-SymbolicName: bundlevideoclient

correct.

> But i got error :
> -> Exception in thread "Thread-3" java.lang.ClassCastException:
> InterfaceFournisseurVideoImpl.InterfaceTransfertVideoImp

You have not provided enough information to know this for sure, but 
GutFeeling(tm) says that you have been relying on "Exported Packages are 
automatically Imported" which was the case in R3 (Oscar), and now requires 
explicit Import-Package. And if you then have the above class (or perhaps 
some of its superclass) loaded internally also is provided in some manner 
which has had its class loaded from another bundle exporting the same 
package. In R3, only one of the packages would be used, but this is not the 
case in R4, if you don't Import what you Export.


Hope that helps.


Cheers
-- 
Niclas Hedhman, Software Developer

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