Edit by Adrien: Since the question was posted without a body, I took the liberty of filling in the symptoms.
If a plugin needs a cache, the Atlassian documentation advises to import following, which doesn't work:
<component-import key="cacheFactory" interface="com.atlassian.cache.CacheFactory" />
The plugin installation fails with the following messages:
Plugin 'com.[...]' never resolved service '&cacheFactory' with filter '(objectClass=com.atlassian.cache.CacheFactory)'
How to use the cache in JIRA?
As Nic said, you haven't given us much to work with, but I'll take a wild stab...
For historic reasons, JIRA exports the heavier CacheManager interface instead of the nice, thin CacheFactory. It really shouldn't do this, because CacheManager has management interfaces that plugins have no business using, like flushing all of the caches, but it's what we did so it's here to stay for the time being.
This may make it harder for the plugin system to resolve it as a CacheFactory, particularly if you are using the atlassian-cache-compat for cross-version compatibility or have made your plugin "transformerless".
@Adrien Ragot (Play SQL / CYO): "... the Atlassian documentation advises ..."
Could you provide a link to the documentation that you're speaking of? The only example of that I have been able to find was in the documentation for Stash add-on developers, and it actually works there because they were not burdened with this historical usage and chose to register it in the container properly.
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