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From "Tom De Wolf (JIRA)" <>
Subject [jira] [Commented] (ARIES-1588) Installation of subsystems fails due to uses constraint violation after exposing feature capabilities.
Date Thu, 09 Mar 2017 16:54:38 GMT


Tom De Wolf commented on ARIES-1588:

[~tjwatson] pull request fixes this issue

> Installation of subsystems fails due to uses constraint violation after exposing feature
> ------------------------------------------------------------------------------------------------------
>                 Key: ARIES-1588
>                 URL:
>             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
> The issue occurs since commit 4c0437de06f34321909a6132a7f2be163b2f6d5 (ARIES-1443). In
earlier versions, we had no issues for these subsystems. 

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