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https://issues.apache.org/jira/browse/ARIES-1445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15134352#comment-15134352
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John Ross commented on ARIES-1445:
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S1 must be the subsystem that is uninstalled. This does not fail if S2 is the
one uninstalled.
------------
When S1 is installed, bundle C is detected as an installable dependency, and
the subsystem properly receives a reference to the bundle. When S2 is
installed, there are no installable dependencies because bundles B and C are
already there. Only bundle B is detected as a shared dependency and becomes
referenced by S2. When S1 is uninstalled, bundle C's reference count goes to
zero, and the bundle is uninstalled.
I still don't understand why S1 must be started before being uninstalled in
order for this to fail, however.
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Because if S1 is not started, bundle C is detected as a shared dependency
during S2's installation and becomes referenced by S2.
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When computing S2's dependencies after S1 has been started, the resolution map
includes a single entry for bundle A which has a single wire to bundle B. This
results in bundles A and B being referenced by S2 but not C. When computing
S2's dependencies before S1 has been started, the resolution map includes
bundles A, B, and C. Thus all three become referenced by S2. The difference in
behavior is because the resolver will only return entries for resources that
were resolved as part of the resolution. When S1 is started, bundles B and C
are resolved. When S2's dependencies are subsequently computed during
installation, bundle C does not appear because it's a transitive dependency of
S2, and bundle B was already resolved.
> Bundles that are not direct dependencies of a subsystem can be removed while
> still in use
> -----------------------------------------------------------------------------------------
>
> Key: ARIES-1445
> URL: https://issues.apache.org/jira/browse/ARIES-1445
> Project: Aries
> Issue Type: Bug
> Components: Subsystem
> Affects Versions: subsystem-2.0.6, subsystem-2.0.8
> Environment: karaf pax-exam
> Reporter: Bas
> Labels: test-patch
> Attachments: UninstallFeatureRemovesReferencedBundle.java.patch
>
>
> Bundle A is a constituent of application subsystem S1
> Bundle A is a constituent of application subsystem S2
> Bundle A has a package import of b.package
> Bundle B exports b.package
> Bundle B imports c.package
> Bundle C exports c.package
> There is an obr repository with bundle b and c
> Bundle B and C are not constituents
> When installing S1 bundle B and C are added to the root subsystem to fullfill
> the requirements of bundle A
> When installing S2 everything is still working.
> Start S1.
> Now we uninstall S1 and bundle C is removed.
> refreshBundles
> Subsystem S2 won't start anymore because of that.
> The testcase uses different bundle ids.
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