just a hint on how optional imports are resolved :-)
AFAIK the framework resolves optional dependencies by the time the
bundle is resolved.
If a optional dependency is deployed later on it's not beeing resolved
in the first bundle
importing it as optional :-)
regards, Achim
Am 24.08.2011 18:37, schrieb Harald Wellmann:
Somewhat weird, yes...
The OSGi spec is a little vague about the semantics of optional
package resolution. It just states that a framework is free to ignore
this dependency.
In my projects, I've also seen cases where a package imported with
resolution:=optional did not resolve, but everything worked fine after
removing the "optional" directive.
As a user, you would expect "optional" to mean "drop this if and only
if there is no other way to satisfy all dependencies", whereas the
spec seems to imply "the framework may drop this depencdency to make
its life easier (and the user's life harder)".
I'm not familiar with the internals of Pax Exam 1.x. From what I've
seen in Pax Exam 2.2.0, the problem should not occur, since the probes
are built with "DynamicImport-Package: *" by default. I've never seen
any optional resolutions.
Hope that helps,
Harald
Am 24.08.2011 16:18, schrieb Samuel Cox:
Hi,
I'm using Pax Exam1 in an attempt at testing OSGi services exposed in
Fuse 4.3.
When I don't use TinyBundles, I get a NoClassDefFoundError with a
cause of ClassNotFoundException for a class representing my service
interface. When I examine the probe's Import-Package header, I see
that it has the package providing this service listed as optional.
I've also printed out all the bundles and the services they provide.
The bundle providing the service starts successfully and the service
is listed.
If I use TinyBundle to alter the probe's Import-Package header such
that the resolution:=optional is removed from the package providing
the service, I don't get the NoClassDefFoundError.
Does this seem weird?
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*Achim Nierbeck*
Apache Karaf<http://karaf.apache.org/> Committer& PMC
OPS4J Pax Web<http://wiki.ops4j.org/display/paxweb/Pax+Web/> Committer&
Project Lead
blog<http://notizblog.nierbeck.de/>
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