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Buddy class loading and blackbox components [message #515588]

Fri, 19 February 2010 13:26

Markus Kuppe

Messages: 177
Registered: July 2009

Senior Member

Hi,

how do I express buddy class loading if bundle A, which is supposed to
load classes of B, is a blackbox component and cannot be changed? I own
B though.

Thanks
Markus

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Re: Buddy class loading and blackbox components [message #515606 is a reply to message #515588]

Fri, 19 February 2010 14:18

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

In this case A must specify a buddy policy (either registered or dependent) to allow it to load any classes from a buddy. There is no way to force buddies onto a bundle that has no buddy policy.

The closest thing OSGi has to that behavior would be to make B a fragment of A. Then A will be able to load anything from B because all of the content from A and B will be loaded from the same class loader.

Tom.

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Re: Buddy class loading and blackbox components [message #515610 is a reply to message #515588]

Fri, 19 February 2010 09:24

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Markus Alexander Kuppe wrote:
> Hi,
>
> how do I express buddy class loading if bundle A, which is supposed to
> load classes of B, is a blackbox component and cannot be changed? I own
> B though.
>

it had to be turned from a jar into a bundle at some point, right? When
that happens, it needs the "Eclipse-BuddyPolicy: registered" (or similar
buddy policy statement) in its MANIFEST.MF.

The B can include "Eclipse-RegisterBuddy: A"

http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/reference/misc/buddy_loading.html

PW

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Paul Webster
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Paul Webster
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Re: Buddy class loading and blackbox components [message #515615 is a reply to message #515610]

Fri, 19 February 2010 14:29

Markus Kuppe

Messages: 177
Registered: July 2009

Senior Member

On 02/19/2010 03:16 PM, Paul Webster wrote:

> it had to be turned from a jar into a bundle at some point, right? When
> that happens, it needs the "Eclipse-BuddyPolicy: registered" (or similar
> buddy policy statement) in its MANIFEST.MF.

True, but this is out of my control as it is packaged by SpringSource. I
guess my only option is to file an enhancement request then.

Thx
Markus

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