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https://issues.apache.org/jira/browse/FELIX-2529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard S. Hall closed FELIX-2529.
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Resolution: Fixed
I've committed a fix for this issue and demonstrated that it works in a
specific scenario while still passing the CT and our tests.
> In some scenarios the resolver will not backtrack on imported package
> decisions
> -------------------------------------------------------------------------------
>
> Key: FELIX-2529
> URL: https://issues.apache.org/jira/browse/FELIX-2529
> Project: Felix
> Issue Type: Improvement
> Components: Framework
> Affects Versions: framework-3.0.0, framework-3.0.1
> Reporter: Richard S. Hall
> Assignee: Richard S. Hall
> Fix For: framework-3.2.0
>
>
> The resolver algorithm detects class space consistency by calculating package
> spaces for each bundle (i.e., which packages it sees and from whom). It then
> starts at the root bundle and determines if its package space is consistent.
> If so, it then checks that any bundles the root bundle depends on are
> consistent. And so on.
> One issue with the current approach is that backtracking for imported
> packages is only occurring if a conflict is detected at a given level.
> However, it is possible that a conflict occurs at a lower level because an
> incorrect choice was made at an upper level. Currently, a lower level
> conflict only creates potential permutations at that level and throws an
> exception. If no permutations were possible at that level, then the exception
> just ends the current resolve attempt.
> The issue is that there may have been alternative decisions that could have
> been made at upper levels, so we need to catch exceptions from the lower
> levels so we can determine if there is a potential alternative at the upper
> level.
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