How many times one module can exist in layer graph

[PavelTurk]

Hello, Alan

Thank you very much for your answer. I could reproduce this problem.
Please, see https://github.com/PavelTurk/jpms-test1
There is a detailed readme and only one class that throws ResolutionException.

Best regards, Pavel

On 12/14/23 3:07 PM, Alan Bateman wrote:
> On 14/12/2023 10:56, PavelTurk wrote:
>> Hello all.
>>
>> Let's suppose that we have 4 layers:
>> 1) boot
>> 2) layerA (parent - boot)
>> 3) layerB (parent-boot)
>> 4) layerC (parents - layerA, layerB)
>>
>> Layers A,B,C were created using defineModulesWithOneLoader​(...).
>>
>> And we have two modules - moduleX and moduleY. ModuleX uses moduleY.
>> ModuleX is located in layerC.
>>
>> Do I understand correctly that moduleY can be located in any layer, but only
>> in ONE layer? I mean, that it is impossible to place moduleY in any TWO layers
>> at the same time - for example in boot layer and layerB.
>>
>> I am asking this because I read that it was possible but I tried all variants and
>> always got ResolutionException: Module ModuleX reads more than one module named
>> ModuleY.
>
> It's possible to have a module "X" n several module layers at the same time.
>
> It's hard to diagnose things from the info in your mail. Can you print the Configuration object for layer A, B and C and paste it into a reply? There may be implied readability in the picture, or it may be related to using a multi-parent Configuration, I can't tell. Also when you say X uses Y then I assume you don't mean services, instead you mean X requires Y, is that right?
>
> -Alan