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https://issues.apache.org/jira/browse/ARIES-1588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wouter Bancken resolved ARIES-1588.
-----------------------------------
Resolution: Fixed
> Installation of subsystems fails due to uses constraint violation after
> exposing feature capabilities.
> ------------------------------------------------------------------------------------------------------
>
> Key: ARIES-1588
> URL: https://issues.apache.org/jira/browse/ARIES-1588
> Project: Aries
> Issue Type: Bug
> Components: Subsystem
> Affects Versions: subsystem-2.1.0
> Reporter: Wouter Bancken
> Fix For: subsystem-2.1.0
>
> Attachments: pax-web-jetty-bundle-4.2.5.jar
>
>
> h4. Setup
> Two feature subsystems
> 1. Feature subsystem with fragment-hosts and fragments
> 2. Feature subsystem with other bundles
> Installation of the second subsystem fails
> h4. Issue
> Installation of the second subsystem fails with the message
> {quote}
> gogo: SubsystemException: org.osgi.service.resolver.ResolutionException: Uses
> constraint violation. Unable to resolve resource
> org.ops4j.pax.web.pax-web-jetty-bundle [124.0] because it exports package
> 'org.apache.xbean.finder.archive' and is also exposed to it from resource
> org.apache.xbean.finder [98.0] via the following dependency chain:
> org.ops4j.pax.web.pax-web-jetty-bundle [124.0]
> import: (osgi.wiring.package=org.apache.xbean.finder)
> export: osgi.wiring.package: org.apache.xbean.finder;
> uses:=org.apache.xbean.finder.archive
> export: osgi.wiring.package=org.apache.xbean.finder.archive
> org.apache.xbean.finder [98.0]
> {quote}
> Before failing a lot of similar messages are logged with the message "DEBUG:
> Candidate permutation failed due to a conflict between an export and import;
> will try another if possible."
> This is especially weird since pax-web-jetty-bundle does not expose the
> org.apache.xbean.finder.archive package (see attached Jar). Both
> pax-web-jetty-bundle and org.apache.xbean.finder are only present in the
> first subsystem.
> In our setup pax-web-jetty-bundle is a fragment-host for a fragment which is
> in the same (first) subsystem. Similar DEBUG statements are printed for other
> fragment-hosts in the first subsystem.
> The issue occurs since commit 4c0437de06f34321909a6132a7f2be163b2f6d5
> (ARIES-1443). In earlier versions, we had no issues for these subsystems.
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