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From "Paul Bjorkstrand (JIRA)" <>
Subject [jira] [Commented] (SLING-8069) Sling Models: Enable constructor injection to use non-public constructors
Date Fri, 02 Nov 2018 19:56:00 GMT


Paul Bjorkstrand commented on SLING-8069:

Added Github PR link since it didn't link automatically

> Sling Models: Enable constructor injection to use non-public constructors
> -------------------------------------------------------------------------
>                 Key: SLING-8069
>                 URL:
>             Project: Sling
>          Issue Type: Improvement
>    Affects Versions: Sling Models Impl 1.4.10
>            Reporter: Paul Bjorkstrand
>            Priority: Minor
> In Sling Models, you cannot use a non-public constructor to inject. Looking through the
code, there doesn't seem to be any clear reason for this restriction. In my opinion, constructor
injection should allow any constructor visibility.
> Here are some discussion points:
>  * Private fields are allowed for use, so disallowing private constructors seems unnecessary.
>  * Private constructors may be bad practice (difficult to test), but Sling should not
be telling users how to write their Java code. This is especially true for models, since it
should work with POJOs, as stated in the documentation. It would be trivial to add checks
to just allow default, protected, or public, but I feel that logic is unnecessary.
>  * Non-public methods could also be allowed, but that can be a separate ticket.
>  ** A prerequisite of this would be to allow setter injection on models in the first
place. Again, not the subject of this ticket.
>  * Threading concerns are minimal, but there could be possible deadlocks, as with any
multi-threaded application that uses locks. In general, I think locking similar to how it
is done in {{InjectableField}} would be sufficient. The risk of deadlock would be similar
to the risk of the locking in {{injectableField.set(Object, Result<Object>)}}.

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