[ARIES-1588] Installation of subsystems fails due to uses constraint violation after exposing feature capabilities.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: subsystem-2.0.10
• Fix Version/s: subsystem-2.0.10
• Component/s: Subsystem
• Assignee: Unassigned
• Reporter: Wouter Bancken
• Created: 27/Jul/16 15:01
• Updated: 17/Mar/17 17:55
• Resolved: 17/Mar/17 17:55

Description

Setup

Two feature subsystems
1. Feature subsystem with fragment-hosts and fragments
2. Feature subsystem with other bundles
Installation of the second subsystem fails

Issue

Installation of the second subsystem fails with the message

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]

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.

Issue Links

• blocks: ARIES-1547 Subsystem 2.0.10 Release
• is blocked by: ARIES-1590 Subsystem install fails due to unexpected resolve conflict