[ARIES-1590] Subsystem install fails due to unexpected resolve conflict

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: subsystem-2.0.10
• Component/s: Subsystem
• Assignee: Unassigned
• Reporter: Tom De Wolf
• Created: 08/Aug/16 13:35
• Updated: 15/Aug/17 09:29
• Resolved: 17/Mar/17 15:16

Description

When we use the 2.0.9-SNAPSHOT version currently in development we get an unexpected resolve conflict:

DEBUG: Candidate permutation failed due to a conflict between imports; will try another if possible. (org.osgi.service.resolver.ResolutionException: Uses constraint violation. Unable to resolve resource org.apache.servicemix.bundles.spring-core [116.0] because it is exposed to package 'org.aspectj.bridge' from resources com.reproduce.reproduce-base-subsystem [org.apache.aries.subsystem.core.internal.BasicSubsystem: children=0, constituents=60, id=3, location=file:///Users/tom/Documents/code/aca-common/osgi-subsystem-support/reproduce-base-subsystem/target/reproduce-base-subsystem-4.1.2-SNAPSHOT.esa, parents=1, state=INSTALLED, symbolicName=com.reproduce.reproduce-base-subsystem, type=osgi.subsystem.feature, version=4.1.2.SNAPSHOT] and org.apache.servicemix.bundles.aspectj [111.0] via two dependency chains.

Chain 1:
org.apache.servicemix.bundles.spring-core [116.0]
import: (&(osgi.wiring.package=org.aspectj.bridge)(version>=1.7.1)(!(version>=2.0.0)))

export: osgi.wiring.package: org.aspectj.bridge
com.reproduce.reproduce-base-subsystem [org.apache.aries.subsystem.core.internal.BasicSubsystem: children=0, constituents=60, id=3, location=file:///Users/tom/Documents/code/aca-common/osgi-subsystem-support/reproduce-base-subsystem/target/reproduce-base-subsystem-4.1.2-SNAPSHOT.esa, parents=1, state=INSTALLED, symbolicName=com.reproduce.reproduce-base-subsystem, type=osgi.subsystem.feature, version=4.1.2.SNAPSHOT]

Chain 2:
org.apache.servicemix.bundles.spring-core [116.0]
import: (&(osgi.wiring.package=org.aspectj.weaver)(version>=1.7.1)(!(version>=2.0.0)))

export: osgi.wiring.package=org.aspectj.weaver; uses:=org.aspectj.weaver.patterns
com.reproduce.reproduce-base-subsystem [org.apache.aries.subsystem.core.internal.BasicSubsystem: children=0, constituents=60, id=3, location=file:///Users/tom/Documents/code/aca-common/osgi-subsystem-support/reproduce-base-subsystem/target/reproduce-base-subsystem-4.1.2-SNAPSHOT.esa, parents=1, state=INSTALLED, symbolicName=com.reproduce.reproduce-base-subsystem, type=osgi.subsystem.feature, version=4.1.2.SNAPSHOT]
import: (&(osgi.wiring.package=org.aspectj.weaver.patterns)(&(version>=1.7.1)(!(version>=2.0.0))))

export: osgi.wiring.package: org.aspectj.weaver.patterns; uses:=org.aspectj.bridge
export: osgi.wiring.package=org.aspectj.bridge
org.apache.servicemix.bundles.aspectj [111.0])

It is unexpected because 1 of the 2 chains points to the actual bundle that exports the package and the other of the 2 chains points to the base subsystem already installed in the runtime. In fact the bundle is part of that subsystem so it should consider both as exactly the same and not consider it as 2 chains he cannot resolve.

Not sure if it is related to ARIES-1588 and the commit mentioned there but that commit does affect how already installed subsystems are taken into account in the resolve process.

Note: we are using the felix resolver 1.4.0, verified it has the same problem with 1.8.0

Steps to reproduce:
1. start clean felix
2. install the attached reproduce-base-subsystem-4.1.2-SNAPSHOT.esa, do not start it
3. install the attached reproduce-subsystem-4.1.2-SNAPSHOT.esa

Step 3 will start failing in DEBUG logging with chain errors like above. It will try a number of permutations but it will not get out of it.

Note: which bundles and packages are shown in the example log above are less important as we have multiple such kind of errors for which only the package and bundles differ.

Issue Links

• blocks: ARIES-1588 Installation of subsystems fails due to uses constraint violation after exposing feature capabilities.
• blocks: ARIES-1547 Subsystem 2.0.10 Release
• is related to: ARIES-1591 Subsystem install fails due to ArrayIndexOutofBoundsException
• links to: GitHub Pull Request #70