Bas created ARIES-1277:
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Summary: the lifecycle of a bundle is not respected according to
the osgi spec. when trying to load a class from a bundle
Key: ARIES-1277
URL: https://issues.apache.org/jira/browse/ARIES-1277
Project: Aries
Issue Type: Bug
Components: Subsystem
Affects Versions: subsystem-core-1.0.0
Environment: Karaf version 3.0.1
org.eclipse.osgi - 3.8.2.v20130124-134944
Java Virtual Machine Java HotSpot(TM) 64-Bit Server VM version
24.55-b03
Version 1.7.0_55
Reporter: Bas
When using a parent-child subsystem setup, the lifecycle of a bundle is not
respected according to the osgi spec. when trying to load a class from a bundle
the BundleActivator is not being called before returning the class in the
following scenario.
When I create the following environment where I create a subsystem parent
'parent1' which is a feature that has a subsystem constituent 'child1'
(application subsystem) and a bundle 'parent-bundle1'. The child subsystem is
an application subsystem and has a bundle 'child-bundle1'.
So subsystem 'parent1' contains 'child1' and 'parent-bundle1'.
Subsystem 'child1' contains 'child-bundle1'.
The 'child-bundle1' tries to use a class from 'parent-bundle1' that should
fetch state that is set in the BundleActivator of 'parent-bundle1'. Sometimes
the logs indicated a nullpointerexception occurred while starting
'parent-bundle1'.
While further analysing the problem it became clear to me it was possible to
load a class while the bundle activator has not been executed. I added some
logging to the code to confirm in the log what I suspected and the log
confirmed my suspicions. I was also able to force the issue by using
'start-order' in the manifest to make sure 'child1' would load before
'parent-bundle1'. Before that I had to try 20x times before it randomly
occurred.
If I read the Osgi spec correctly it says the BundleActivator.start should
finish before a class from that bundle is returned. I didn't find anything in
the subsystem spec that describes a different flow when using subsystems.
I would expect 'parent-bundle1' to be started and become active at the point
where 'child-bundle1' tries to load a class from 'parent-bundle1'.
What happens is 'parent-bundle1' is not being activated but the class is
returned causing a nullpointerexception when the state is queried. At the point
where 'parent1' is trying to start bundle 'parent-bundle1' it succeeds as you
would expect.
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