[slf4j-dev] [JIRA] (SLF4J-407) Jigsaw modules contain clashing package

[QOS.CH (JIRA)]

    [ https://jira.qos.ch/browse/SLF4J-407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18759#comment-18759 ] 

Ceki Gülcü commented on SLF4J-407:
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At present time, it seems that including org.slf4j.impl packages in order to cater for older versions of slf4j-api.jar in the class path seems worthwhile at the moment.

By the way, I acknowledge your point about JPMS runtime rejecting multiple providers on the class path, leaving no opportunity to SLF4J to output a helpful message.

I am somewhat conflicted about including org.slf4j.impl packages in slf4j providers and intend to revisit the issue in the near future.

> Jigsaw modules contain clashing package
> ---------------------------------------
>
>                 Key: SLF4J-407
>                 URL: https://jira.qos.ch/browse/SLF4J-407
>             Project: SLF4J
>          Issue Type: Bug
>          Components: Implementations
>    Affects Versions: 1.8.0-alpha1
>            Reporter: Stephen Colebourne
>            Assignee: SLF4J developers list
>             Fix For: 1.8.0-alpha2
>
>
> Looking at the slf4j-jdk14 and slf4j-nop artifacts, they both appear to contain the package `org.slf4j.impl`. Jigsaw will refuse to load two modules that contain the same package, so this will be a problem.
> I know that SLF4J does not intend users to load both of these modules at the same time. But the current setup means that it will be the JPMS runtime that rejects it, meaning that there is no chance for SLF4J to output a helpful message (as I believe it does today).
> The solution to this would appear to be to move the `org.slf4j.impl` package to `org.slf4j.jul.impl` and `org.slf4j.nop.impl`. As the impl package is not exported, this should not affect any user code (except code that would have been affected anyway).
> I imagine this affects other slf4j artifacts.
> I also note that [this module-info.java|https://github.com/qos-ch/slf4j/blob/1_8_0-SNAPSHOT/slf4j-jdk14/src/main/java/module-info.java] exports the `org.slf4j.jul` package, which seems unnecessary (simple and nop do not export their package).
> See [here|http://blog.joda.org/2017/04/java-se-9-jpms-module-naming.html] for more information on naming.



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