[ODLPARENT-242] Service Component Runtime does not conform to R6 spec w.r.t Factory Components Created: 31/Jul/20  Updated: 21/Sep/20  Resolved: 21/Sep/20

Status: Resolved
Project: odlparent
Component/s: Karaf
Affects Version/s: None
Fix Version/s: 8.0.0, 7.0.6, 6.0.12

Type: Bug Priority: Medium
Reporter: Robert Varga Assignee: Robert Varga
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

External issue ID: https://issues.apache.org/jira/browse/FELIX-6315

 Description   

Felix SCR 4.1.20 (and before), as bundled with karaf-4.2.9, fails to enforce correct lifecycle on factory-defined component configurations.

In particular, SCR will deactivate such a component configuration when its services become unused, such as going through a getService/ungetService cycle. This mirrors the lifecycle of a Delayed Component, not a Factory component – see sections 112.5.4 and 112.5.5 of OSGi Compendium spec.

This issue tracks two things:

  1. the upstream fix as tracked in https://issues.apache.org/jira/browse/FELIX-6315 and its adoption in odlparent
  2. a stop-gap mitigation

The mitigation comes in form of https://issues.apache.org/jira/browse/FELIX-3039, i.e. preventing Felix from deactivating unused delayed components.

 Comments   
Comment by Robert Varga [ 31/Jul/20 ] 
nite@nitebug : ~/odl/controller/karaf/controller-test-karaf-2.0.4-SNAPSHOT on master $ cat etc/org.apache.felix.scr.ScrService.cfg
# Workaround for FELIX-6315
ds.delayed.keepInstances = true

seems to hide the problem well enough. Although it may be overreaching, adding properly-namespaced attributes to component definitions, so as to localize this to specific components, seems less than convenient.

Comment by Robert Varga [ 16/Sep/20 ]

Upstream has accepted the fix, hence it will appear in scr-2.1.24.

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