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https://issues.apache.org/jira/browse/IVY-382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463821
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Xavier Hanin commented on IVY-382:
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Conflict resolution and revision eviction is not a simple thing, because you
have only a limited a view of the whole dependency graph at the time you look
for a revision. That's why order in dependencies is important : if Ivy find the
dependency on revision 1 of D before finding the dependency on revision 2, it
will try to find it's module descriptor, or an artifact if no module descriptor
is found. If neither one or the other is found, it is considered as an error,
since at this time Ivy doesn't know that it will be evicted by the dependency
on revision 2. This could be solved by marking the revision as being not found,
and then only give a warning because we later find the revision 2.
If dependency on revision 2 is found before, then I think Ivy will still try to
find the module descriptor of revision 1 to merge them. Indeed, imagine you had
a configuration in revision 1 on which B depends that no longer exist in
revision 2. This would cause an error without merging. That's why I think there
is an error too in this case, even if I'm not sure. The problem is easier to
solve in this case, because we already have the information that the revision 1
will be evicted.
> Ivy dies when it can't find evicted modules
> -------------------------------------------
>
> Key: IVY-382
> URL: https://issues.apache.org/jira/browse/IVY-382
> Project: Ivy
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.4
> Environment: JDK 1.5
> Reporter: John Williams
>
> Suppose module A depends on B and C, B depends of revision 1 of D, and C
> depends revision 2 of D. Attempting to resolve A will fail if Ivy can't find
> revision 1 of D, even though only revision 2 is actually needed.
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