RE: [equinox-dev] getservice throws class cast exception

[Santosh Akhilesh <santoshakhilesh@xxxxxxxxxx>]

Hi,

Thanks I got the problem solved as per your suggestion.

However I could make it work with two bundles as per Toni's hint

I included the jar in to the bundle one which was registering the service,
this bundle exported the interface A.

In the second bundle I just imported the interface A and retrieved the
object and cast to A successfully.

Thanks for your help and time.

Cheers,
Santosh Akhilesh
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-----Original Message-----
From: equinox-dev-bounces@xxxxxxxxxxx
[mailto:equinox-dev-bounces@xxxxxxxxxxx] On Behalf Of njbartlett@xxxxxxxxx
Sent: Thursday, May 29, 2008 9:02 PM
To: Equinox development mailing list
Subject: Re: [equinox-dev] getservice throws class cast exception

Santosh,

You should not include the JAR that contains the interface in the
classpath of the two bundles. You should make it into a third bundle
and use Import-Package to depend on the interface.

When a class is defined independently by two or more classloaders, the
resulting classes are considered by the JVM to be different, even if
they have exactly the same name and are defined from the same bytes on
disk. Therefore you cannot cast an instance of one type into a field
of the other.

Regards
Neil

On 5/29/08, Santosh Akhilesh <santoshakhilesh@xxxxxxxxxx> wrote:
> Dear All,
>
>
>
> I am new to OSGI and Equinox.
>
>
>
> I have defined an interface say A, this is defined in a project and
exported
> as jar
>
>
>
> Now I create Two OSGI bundles I include this jar in both the bundles.
>
>
>
> >From one bundle I implement the interface A and register the service to
the
> bundle context from second bundle I try to retrieve this service from
bundle
> context in the activator start function.
>
>
>
> I can see that service is retrieved but when I cast it to interface A, I
get
> class cast exception
>
>
>
> Any pointer why this happens and how to correct it.
>
>
>
> Regards,
>
> Santosh Akhilesh
>
> Ph: 9845482201
>
>
>
>
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